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

In Bioconductor/MatrixGenerics: S4 Generic Summary Statistic Functions that Operate on Matrix-Like Objects

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 = TRUE)

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

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

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

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

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

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 TRUE (default), names attributes of result are set. Else if FALSE, no naming support is done.
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, table, or numeric call matrixStats::rowCollapse / matrixStats::colCollapse.

Value

Returns a numeric vector of length N (K).

See Also

• matrixStats::rowCollapse() and matrixStats::colCollapse() which are used when the input is a matrix or numeric vector.

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)

Bioconductor/MatrixGenerics documentation built on June 14, 2025, 1:10 p.m.