rowCollapse {MatrixGenerics}R Documentation

Extract one cell from each row (column) of a matrix-like object

Description

Extract one cell from each row (column) of a matrix-like object.

Usage

rowCollapse(x, idxs, rows = NULL, ..., useNames = NA)

## S4 method for signature 'matrix_OR_array_OR_table_OR_numeric'
rowCollapse(x, idxs, rows = NULL, dim. = dim(x), ..., useNames = NA)

## S4 method for signature 'ANY'
rowCollapse(x, idxs, rows = NULL, ..., useNames = NA)

colCollapse(x, idxs = idxs, cols = NULL, ..., useNames = NA)

## S4 method for signature 'matrix_OR_array_OR_table_OR_numeric'
colCollapse(x, idxs, cols = NULL, dim. = dim(x), ..., useNames = NA)

## S4 method for signature 'ANY'
colCollapse(x, idxs = idxs, cols = NULL, ..., useNames = NA)

Arguments

x

An NxK matrix-like object.

idxs

An index vector with the position to extract. It is recycled to match the number of rows (column)

rows, cols

A vector indicating the subset of rows (and/or columns) to operate over. If NULL, no subsetting is done.

...

Additional arguments passed to specific methods.

useNames

If NA, the default behavior of the function about naming support is remained. If FALSE, no naming support is done. Else if TRUE, names attributes of result are set.

dim.

An integer vector of length two specifying the dimension of x, essential when x is a numeric vector. Note, that this is not a generic argument and not all methods need provide it.

Details

The S4 methods for x of type matrix, array, or numeric call matrixStats::rowCollapse / matrixStats::colCollapse.

Value

Returns a numeric vector of length N (K).

See Also

Examples

  mat <- matrix(rnorm(15), nrow = 5, ncol = 3)
  mat[2, 1] <- NA
  mat[3, 3] <- Inf
  mat[4, 1] <- 0

  print(mat)

  rowCollapse(mat, idxs = 2)
  rowCollapse(mat, idxs = c(1,1,2,3,2))

  colCollapse (mat, idxs = 4)
[Package MatrixGenerics version 1.8.1 Index]