replace: Replace elements in a vector

In wahani/dat: Tools for Data Manipulation

Description

This function replaces elements in a vector. It is a link to replace as a generic function.

Usage

replace(x, ind, values, ...)

## S4 method for signature 'ANY,'function''
replace(x, ind, values, ...)

## S4 method for signature 'ANY,formula'
replace(x, ind, values, ...)

## S4 method for signature 'ANY,character'
replace(x, ind, values, ...)

Arguments

x	(atomic | list) a vector.
ind	used as index for elements to be replaced. See details.
values	the values used for replacement.
...	arguments passed to ind if it can be interpreted as function. For a regex arguments are passed to grep.

Details

The idea is to provide a more flexible interface for the specification of the index. It can be a character, numeric, integer or logical which is then simply used in base::replace. It can be a regular expression in which case x should be named – a character of length 1 and a leading "^" is interpreted as regex. When ind is a function (or formula) and x is a list then it should be a predicate function – see the examples. When x is an atomic the function is applied on x and the result is used for subsetting.

Examples

replace(c(1, 2, NA), is.na, 0)
replace(c(1, 2, NA), rep(TRUE, 3), 0)
replace(c(1, 2, NA), 3, 0)
replace(list(x = 1, y = 2), "x", 0)
replace(list(x = 1, y = 2), "^x$", 0)
replace(list(x = 1, y = "a"), is.character, NULL)

wahani/dat documentation built on Dec. 8, 2020, 10:57 a.m.