Set values in an object using indexing

Chainable functional alias for x[i, j] <- value. It provides flexibility for setting values using either one or two indices. Note that if you only want to modify columns (j), the argument along with the value must be named. Alternatively use setCol. if neither i nor j is provided, an error is thrown.

Usage

setIndex(x, i, j, value)

Arguments

x

An object that supports the "[<-" method, such as a matrix or data frame.

i

Row index

j

Column index

value

The value to assign to the specified index/indices.

Value

The modified object.

See also

setCol(), setRow()

Examples

mat <- matrix(1:9, nrow = 3)
setIndex(mat, 1, 2, 10)  # Set value at position (1, 2)
#>      [,1] [,2] [,3]
#> [1,]    1   10    7
#> [2,]    2    5    8
#> [3,]    3    6    9
setIndex(mat, 1, value = 20)  # Set entire first row to 20
#>      [,1] [,2] [,3]
#> [1,]   20   20   20
#> [2,]    2    5    8
#> [3,]    3    6    9
setIndex(mat, j = 3, value = 30)  # Set entire third column to 30
#>      [,1] [,2] [,3]
#> [1,]    1    4   30
#> [2,]    2    5   30
#> [3,]    3    6   30