
Basics
The htmlTable package is intended for generating
tables using HTML
formatting. This format is compatible with Markdown when used for
HTML-output. The most basic table can easily be created by just passing
a matrix or a data.frame to the
htmlTable-function:
library(magrittr)
library(htmlTable)
# A simple output
output <- matrix(1:4,
ncol=2,
dimnames = list(list("Row 1", "Row 2"),
list("Column 1", "Column 2")))
htmlTable(output)
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Column 1
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Column 2
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Row 1
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1
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3
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Row 2
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2
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4
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If you are using dplyr and tidyverse a
convenient wrapper is the tidyHtmlTable function (check out
vignette("tidyHtmlTable")). A simple example of the
tidyHtmlTable would look something like this:
library(tidyverse)
library(glue)
mtcars |>
as_tibble(rownames = "rnames") |>
filter(cyl == 6 & qsec < 18) |>
pivot_longer(names_to = "per_metric",
cols = c(hp, mpg, qsec)) |>
arrange(gear, rnames) |>
mutate(gear = glue("{gear} gears")) |>
addHtmlTableStyle(align = "r") |>
tidyHtmlTable(header = per_metric, rnames = rnames, rgroup = gear,
caption = "A simple <code>tidyHtmlTable</code> example using <code>mtcars</code>")
A simple tidyHtmlTable example using mtcars
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hp
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mpg
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qsec
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4 gears
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Mazda RX4
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110
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21
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16.46
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Mazda RX4 Wag
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110
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21
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17.02
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5 gears
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Ferrari Dino
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175
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19.7
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15.5
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Advanced
While it may be sufficient for basic tables a more advanced layout is
often needed in medical publications with elements such as:
- row groups
- column spanners
- table spanners
- caption
- table footer
- zebra coloring (also know as banding):
As many journals require that a MS Word-document is submitted it is
furthermore also important that the table imports correctly to a word
processor, i.e. that the table doesn’t only look nice in a web browser
but also in the final document. The htmlTable-function is
written for all these purposes.
Note: Due to GitHub CSS-styles the rows get
automatically zebra-striped (in a bad way), borders get overridden and I
haven’t been able to figure out how to change this. See the vignette for
a correct example:
vignette("general", package = "htmlTable")
For demonstration purposes we will setup a basic matrix:
mx <-
matrix(ncol=6, nrow=8) |>
set_rownames(paste(c("1st", "2nd", "3rd",
paste0(4:8, "th")),
"row")) |>
set_colnames(paste(c("1st", "2nd", "3rd",
paste0(4:6, "th")),
"hdr"))
for (nr in 1:nrow(mx)){
for (nc in 1:ncol(mx)){
mx[nr, nc] <-
paste0(nr, ":", nc)
}
}
Row groups
The purpose of the row groups is to group variables that belong to
the same group, e.g. a factored variable with more than two levels often
benefit from grouping variables together.
htmlTable(mx,
rgroup = paste("Group", LETTERS[1:3]),
n.rgroup = c(2,4,nrow(mx) - 6))
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1st hdr
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2nd hdr
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3rd hdr
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4th hdr
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5th hdr
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6th hdr
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Group A
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1st row
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1:1
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1:2
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1:3
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1:4
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1:5
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1:6
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2nd row
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2:1
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2:2
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2:3
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2:4
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2:5
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2:6
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Group B
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3rd row
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3:1
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3:2
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3:3
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3:4
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3:5
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3:6
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4th row
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4:1
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4:2
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4:3
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4:4
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4:5
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4:6
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5th row
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5:1
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5:2
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5:3
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5:4
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5:5
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5:6
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6th row
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6:1
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6:2
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6:3
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6:4
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6:5
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6:6
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Group C
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7th row
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7:1
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7:2
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7:3
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7:4
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7:5
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7:6
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8th row
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8:1
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8:2
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8:3
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8:4
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8:5
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8:6
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We can easily mix row groups with regular variables by having an
empty row group name "":
htmlTable(mx,
rgroup = c(paste("Group", LETTERS[1:2]), ""),
n.rgroup = c(2,4,nrow(mx) - 6))
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1st hdr
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2nd hdr
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3rd hdr
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4th hdr
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5th hdr
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6th hdr
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Group A
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1st row
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1:1
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1:2
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1:3
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1:4
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1:5
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1:6
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2nd row
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2:1
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2:2
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2:3
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2:4
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2:5
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2:6
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Group B
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3rd row
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3:1
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3:2
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3:3
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3:4
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3:5
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3:6
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4th row
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4:1
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4:2
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4:3
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4:4
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4:5
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4:6
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5th row
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5:1
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5:2
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5:3
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5:4
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5:5
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5:6
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6th row
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6:1
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6:2
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6:3
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6:4
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6:5
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6:6
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7th row
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7:1
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7:2
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7:3
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7:4
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7:5
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7:6
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8th row
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8:1
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8:2
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8:3
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8:4
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8:5
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8:6
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When mixing row groups with variables without row groups we may want
to omit the bold formatting of the row group label. As of htmlTable
version 2.0 you can separate the css styling using
addHtmlTableStyle:
mx |>
addHtmlTableStyle(css.rgroup = "") |>
htmlTable(rgroup = c(paste("Group", LETTERS[1:2]), ""),
n.rgroup = c(2,4,nrow(mx) - 6))
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1st hdr
|
2nd hdr
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3rd hdr
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4th hdr
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5th hdr
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6th hdr
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Group A
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1st row
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1:1
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1:2
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1:3
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1:4
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1:5
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1:6
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2nd row
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2:1
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2:2
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2:3
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2:4
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2:5
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2:6
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Group B
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3rd row
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3:1
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3:2
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3:3
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3:4
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3:5
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3:6
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4th row
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4:1
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4:2
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4:3
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4:4
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4:5
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4:6
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5th row
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5:1
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5:2
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5:3
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5:4
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5:5
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5:6
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6th row
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6:1
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6:2
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6:3
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6:4
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6:5
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6:6
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7th row
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7:1
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7:2
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7:3
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7:4
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7:5
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7:6
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8th row
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8:1
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8:2
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8:3
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8:4
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8:5
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8:6
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Column spanners
A column spanner spans 2 or more columns:
htmlTable(mx,
cgroup = c("Cgroup 1", "Cgroup 2"),
n.cgroup = c(2,4))
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Cgroup 1
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Cgroup 2
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1st hdr
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2nd hdr
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3rd hdr
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4th hdr
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5th hdr
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6th hdr
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1st row
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1:1
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1:2
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1:3
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1:4
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1:5
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1:6
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2nd row
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2:1
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2:2
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2:3
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2:4
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2:5
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2:6
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3rd row
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3:1
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3:2
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3:3
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3:4
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3:5
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3:6
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4th row
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4:1
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4:2
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4:3
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4:4
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4:5
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4:6
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5th row
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5:1
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5:2
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5:3
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5:4
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5:5
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5:6
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6th row
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6:1
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6:2
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6:3
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6:4
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6:5
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6:6
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7th row
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7:1
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7:2
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7:3
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7:4
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7:5
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7:6
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8th row
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8:1
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8:2
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8:3
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8:4
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8:5
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8:6
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It can sometimes be convenient to have column spanners in multiple
levels:
htmlTable(mx,
cgroup = rbind(c("", "Column spanners", NA),
c("", "Cgroup 1", "Cgroup 2")),
n.cgroup = rbind(c(1,2,NA),
c(2,2,2)))
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Column spanners
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Cgroup 1
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Cgroup 2
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1st hdr
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2nd hdr
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3rd hdr
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4th hdr
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5th hdr
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6th hdr
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1st row
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1:1
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1:2
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1:3
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1:4
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1:5
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1:6
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2nd row
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2:1
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2:2
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2:3
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2:4
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2:5
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2:6
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3rd row
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3:1
|
3:2
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3:3
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3:4
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3:5
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3:6
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4th row
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4:1
|
4:2
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|
4:3
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4:4
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4:5
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4:6
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|
5th row
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5:1
|
5:2
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5:3
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5:4
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5:5
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5:6
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6th row
|
6:1
|
6:2
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6:3
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6:4
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6:5
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6:6
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7th row
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7:1
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7:2
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7:3
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7:4
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7:5
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7:6
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8th row
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8:1
|
8:2
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8:3
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8:4
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8:5
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8:6
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Above example allows the column spanner to be a sum of the underlying
cgroups (see n.cgroup), this is not required by the function:
htmlTable(mx,
cgroup = rbind(c("", "Column spanners", NA),
c("", "Cgroup 1", "Cgroup 2")),
n.cgroup = rbind(c(1,5,NA),
c(2,1,3)))
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Column spanners
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|
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Cgroup 1
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Cgroup 2
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|
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1st hdr
|
|
2nd hdr
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|
3rd hdr
|
|
4th hdr
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5th hdr
|
6th hdr
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|
1st row
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1:1
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|
1:2
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|
1:3
|
|
1:4
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1:5
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1:6
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|
2nd row
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2:1
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|
2:2
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|
2:3
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2:4
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2:5
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2:6
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|
3rd row
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3:1
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|
3:2
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|
3:3
|
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3:4
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3:5
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3:6
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|
4th row
|
4:1
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|
4:2
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|
4:3
|
|
4:4
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4:5
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4:6
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|
5th row
|
5:1
|
|
5:2
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|
5:3
|
|
5:4
|
5:5
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5:6
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|
6th row
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6:1
|
|
6:2
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|
6:3
|
|
6:4
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6:5
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6:6
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|
7th row
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7:1
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|
7:2
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|
7:3
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|
7:4
|
7:5
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7:6
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|
8th row
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8:1
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|
8:2
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|
8:3
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|
8:4
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8:5
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8:6
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Table spanners
A table spanner is similar to rgroup but has the primary purpose of
combining 2 or more tables with the same columns into one:
htmlTable(mx,
tspanner = paste("Spanner", LETTERS[1:3]),
n.tspanner = c(2,4,nrow(mx) - 6))
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1st hdr
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2nd hdr
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3rd hdr
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4th hdr
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5th hdr
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6th hdr
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Spanner A
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1st row
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1:1
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1:2
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1:3
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1:4
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1:5
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1:6
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2nd row
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2:1
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2:2
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2:3
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2:4
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2:5
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2:6
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Spanner B
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3rd row
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3:1
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3:2
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3:3
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3:4
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3:5
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3:6
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|
4th row
|
4:1
|
4:2
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4:3
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4:4
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4:5
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4:6
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|
5th row
|
5:1
|
5:2
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5:3
|
5:4
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5:5
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5:6
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|
6th row
|
6:1
|
6:2
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6:3
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6:4
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6:5
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6:6
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Spanner C
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7th row
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7:1
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7:2
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7:3
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7:4
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7:5
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7:6
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|
8th row
|
8:1
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8:2
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8:3
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8:4
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8:5
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8:6
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Table caption
The table caption is simply the table description and can be either
located above or below the table:
htmlTable(mx[1:2,1:2],
caption="A table caption above")
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Table 5: A table caption above
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1st hdr
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2nd hdr
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1st row
|
1:1
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1:2
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2nd row
|
2:1
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2:2
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mx[1:2,1:2] |>
addHtmlTableStyle(pos.caption = "bottom") |>
htmlTable(caption="A table caption below")
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1st hdr
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2nd hdr
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1st row
|
1:1
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1:2
|
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2nd row
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2:1
|
2:2
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Table 6: A table caption below
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A more interesting detail that the function allows for is table
numbering, initialized by:
options(table_counter = TRUE)
htmlTable(mx[1:2,1:2],
caption="A table caption with a numbering")
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Table 1: A table caption with a numbering
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1st hdr
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2nd hdr
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1st row
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1:1
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1:2
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2nd row
|
2:1
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2:2
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As we often want to reference the table number in the text there are
two associated functions:
## [1] 1
## [1] 2
The footer usually contains specifics regarding variables and is
always located at the foot of the table:
htmlTable(mx[1:2,1:2],
tfoot="A table footer")
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1st hdr
|
2nd hdr
|
|
1st row
|
1:1
|
1:2
|
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2nd row
|
2:1
|
2:2
|
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A table footer
|
Putting it all together
Now if we want to do everything in one table it may look like
this:
mx |>
addHtmlTableStyle(col.columns = c(rep("none", 2), rep("#F5FBFF", 4)),
col.rgroup = c("none", "#F7F7F7"),
css.cell = "padding-left: .5em; padding-right: .2em;",
align="r") |>
htmlTable(rgroup = paste("Group", LETTERS[1:3]),
n.rgroup = c(2, 4),
cgroup = rbind(c("", "Column spanners", NA),
c("", "Cgroup 1", "Cgroup 2†")),
n.cgroup = rbind(c(1, 2, NA), c(2, 2, 2)),
caption="A table with column spanners, row groups, and zebra striping",
tfoot="† A table footer commment",
cspan.rgroup = 2)
|
Table 2: A table with column spanners, row groups, and zebra striping
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Column spanners
|
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Cgroup 1
|
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Cgroup 2†
|
|
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1st hdr
|
2nd hdr
|
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3rd hdr
|
4th hdr
|
|
5th hdr
|
6th hdr
|
|
Group A
|
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right;'></td>
<td style='font-weight: 900;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #f5fbff;'></td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #f5fbff;'></td>
<td style='font-weight: 900; background-color: #f5fbff;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #f5fbff;'></td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #f5fbff;'></td></tr>
<tr>
<td style='text-align: left;'> 1st row</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right;'>1:1</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right;'>1:2</td>
<td style='' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>1:3</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>1:4</td>
<td style='background-color: #f5fbff;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>1:5</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>1:6</td>
</tr>
<tr>
<td style='text-align: left;'> 2nd row</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right;'>2:1</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right;'>2:2</td>
<td style='' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>2:3</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>2:4</td>
<td style='background-color: #f5fbff;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>2:5</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>2:6</td>
</tr>
<tr><td colspan='2' style='font-weight: 900; background-color: #f7f7f7;'>Group B</td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; background-color: #f7f7f7; text-align: right;'></td>
<td style='font-weight: 900; background-color: #f7f7f7;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #F6F9FB;'></td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #F6F9FB;'></td>
<td style='font-weight: 900; background-color: #F6F9FB;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #F6F9FB;'></td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #F6F9FB;'></td></tr>
<tr style='background-color: #f7f7f7;'>
<td style='background-color: #f7f7f7; text-align: left;'> 3rd row</td>
<td style='padding-left: .5em; padding-right: .2em; background-color: #f7f7f7; text-align: right;'>3:1</td>
<td style='padding-left: .5em; padding-right: .2em; background-color: #f7f7f7; text-align: right;'>3:2</td>
<td style='background-color: #f7f7f7;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>3:3</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>3:4</td>
<td style='background-color: #F6F9FB;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>3:5</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>3:6</td>
</tr>
<tr style='background-color: #f7f7f7;'>
<td style='background-color: #f7f7f7; text-align: left;'> 4th row</td>
<td style='padding-left: .5em; padding-right: .2em; background-color: #f7f7f7; text-align: right;'>4:1</td>
<td style='padding-left: .5em; padding-right: .2em; background-color: #f7f7f7; text-align: right;'>4:2</td>
<td style='background-color: #f7f7f7;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>4:3</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>4:4</td>
<td style='background-color: #F6F9FB;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>4:5</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>4:6</td>
</tr>
<tr style='background-color: #f7f7f7;'>
<td style='background-color: #f7f7f7; text-align: left;'> 5th row</td>
<td style='padding-left: .5em; padding-right: .2em; background-color: #f7f7f7; text-align: right;'>5:1</td>
<td style='padding-left: .5em; padding-right: .2em; background-color: #f7f7f7; text-align: right;'>5:2</td>
<td style='background-color: #f7f7f7;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>5:3</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>5:4</td>
<td style='background-color: #F6F9FB;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>5:5</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>5:6</td>
</tr>
<tr style='background-color: #f7f7f7;'>
<td style='background-color: #f7f7f7; text-align: left;'> 6th row</td>
<td style='padding-left: .5em; padding-right: .2em; background-color: #f7f7f7; text-align: right;'>6:1</td>
<td style='padding-left: .5em; padding-right: .2em; background-color: #f7f7f7; text-align: right;'>6:2</td>
<td style='background-color: #f7f7f7;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>6:3</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>6:4</td>
<td style='background-color: #F6F9FB;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>6:5</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #F6F9FB;'>6:6</td>
</tr>
<tr><td colspan='2' style='font-weight: 900;'>Group C</td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right;'></td>
<td style='font-weight: 900;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #f5fbff;'></td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #f5fbff;'></td>
<td style='font-weight: 900; background-color: #f5fbff;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #f5fbff;'></td>
<td style='padding-left: .5em; padding-right: .2em; font-weight: 900; text-align: right; background-color: #f5fbff;'></td></tr>
<tr>
<td style='text-align: left;'> 7th row</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right;'>7:1</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right;'>7:2</td>
<td style='' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>7:3</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>7:4</td>
<td style='background-color: #f5fbff;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>7:5</td>
<td style='padding-left: .5em; padding-right: .2em; text-align: right; background-color: #f5fbff;'>7:6</td>
</tr>
<tr>
<td style='border-bottom: 2px solid grey; text-align: left;'> 8th row</td>
<td style='padding-left: .5em; padding-right: .2em; border-bottom: 2px solid grey; text-align: right;'>8:1</td>
<td style='padding-left: .5em; padding-right: .2em; border-bottom: 2px solid grey; text-align: right;'>8:2</td>
<td style='border-bottom: 2px solid grey;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; border-bottom: 2px solid grey; text-align: right; background-color: #f5fbff;'>8:3</td>
<td style='padding-left: .5em; padding-right: .2em; border-bottom: 2px solid grey; text-align: right; background-color: #f5fbff;'>8:4</td>
<td style='border-bottom: 2px solid grey; background-color: #f5fbff;' colspan='1'> </td>
<td style='padding-left: .5em; padding-right: .2em; border-bottom: 2px solid grey; text-align: right; background-color: #f5fbff;'>8:5</td>
<td style='padding-left: .5em; padding-right: .2em; border-bottom: 2px solid grey; text-align: right; background-color: #f5fbff;'>8:6</td>
</tr>
</tbody>
<tfoot><tr><td colspan='9'>
† A table footer comment</td></tr></tfoot>