rowspecs: Different ways to select rows and columns

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Different ways to select rows and columns

Description

This help page describes how to use the row and col arguments in ⁠set_*⁠ functions.

The basics

The ⁠set_*⁠ functions for cell properties all have arguments like this: set_property(ht, row, col, value).

You can treat row and col arguments like arguments for data frame subsetting. For example, you can use row = 1:3 to get the first three rows, col = "salary" to specify the column named "salary", or row = ht$salary >= 50000 to specify rows where a condition is true.

There are also a few extra tricks you can use:

• Write set_property(ht, x), omitting row and col, to set the property to x for all cells.

• Use everywhere to refer to all rows or all columns.

• Use final(n) to refer to the last n rows or columns.

• Use evens to get only even rows/columns and odds for only odd ones.

• Use stripe(n, from = m) to get every nth row/column starting at row/column m.

• Use dplyr functions like starts_with, contains and matches to specify columns (but not rows). See tidyselect::language for a full list.

The gory details

How the row and col arguments are parsed depends on the number of arguments passed to the ⁠set_*⁠ function.

• If there are two arguments then the second argument is taken as the value and is set for all rows and columns.

• If there are four arguments:

  • If row or col is numeric, character or logical, it is evaluated just as in standard subsetting. col will be evaluated in a special context provided by tidyselect::with_vars() to allow the use of dplyr functions.

  • If row or col is a function,it is called with two arguments: the huxtable, and the dimension number being evaluated, i.e. 1 for rows, 2 for columns. It must return a vector of column indices. evens(), odds(), stripe() and final() return functions for this purpose.

Examples

set_bold(jams, 2:4, 1:2, TRUE)
set_background_color(jams, evens, everywhere,
      "grey95")
set_bold(jams, everywhere,
      tidyselect::matches("yp"), TRUE)

set_text_color(jams, 2:4, 1:2,
      c("red", "violetred", "purple"))

huxtable documentation built on Oct. 2, 2024, 1:06 a.m.