Movatterモバイル変換

# install from CRANinstall.packages("kableExtra")# install the development versionremotes::install_github("haozhu233/kableExtra")

library(knitr)library(kableExtra)kable(iris)%>%kable_styling(latex_options ="striped")

10.2.1 Set the font size

The functionkable_styling() inkableExtra allows you to style the whole table. For example, you can specify the alignment of the table on the page, the width, and the font size of the table. Below is an example of using a smaller font size:

kable(head(iris,5),booktabs =TRUE)%>%kable_styling(font_size =8)

10.2.2 Style specific rows/columns

The functionsrow_spec() andcolumn_spec() can be used to style individual rows and columns, respectively. In the example below, we make the first row bold and italic, add a black background to the second and third rows while changing the font color to white, underline the fourth row and change its typeface, rotate the fifth row, and strike out the fifth column:

kable(head(iris,5),align ='c',booktabs =TRUE)%>%row_spec(1,bold =TRUE,italic =TRUE)%>%row_spec(2:3,color ='white',background ='black')%>%row_spec(4,underline =TRUE,monospace =TRUE)%>%row_spec(5,angle =45)%>%column_spec(5,strikeout =TRUE)

Similarly, you can style individual cells with thecell_spec() function.

10.2.3 Group rows/columns

Rows and columns can be grouped via the functionspack_rows() andadd_header_above(), respectively. You can also collapse rows viacollapse_rows(), so one cell can span multiple rows. Below is an example that shows a custom table header with grouped columns:

iris2<- iris[1:5,c(1,3,2,4,5)]names(iris2)<-gsub('[.].+','',names(iris2))kable(iris2,booktabs =TRUE)%>%add_header_above(c("Length"=2,"Width"=2," "=1))%>%add_header_above(c("Measurements"=4,"More attributes"=1))

For the named vector inadd_header_above(), the names are the text to be shown in the table header, and the integer values of the vector indicate how many columns a name should span, e.g.,"Length" = 2 meansLength should span two columns.

Below is an example ofpack_rows(). The meaning of itsindex argument is similar to the argument ofadd_header_above() as we just explained before.

iris3<- iris[c(1:2,51:54,101:103), ]kable(iris3[,1:4],booktabs =TRUE)%>%pack_rows(index =c("setosa"=2,"versicolor"=4,"virginica"=3))

10.2.4 Scaling down wide tables in LaTeX

There are a few features that are specific to the HTML or LaTeX output format. For example, landscape pages only make sense in LaTeX, so thelandscape() function inkableExtra only works for LaTeX output. Below we show an example to scale down a table to fit the page (otherwise it would be too wide):

tab<-kable(tail(mtcars,5),booktabs =TRUE)tab# original table (too wide)

tab%>%kable_styling(latex_options ="scale_down")

You will not see any differences in the above two tables if you are viewing the HTML version.