colCollapse,dgCMatrix-method {sparseMatrixStats} | R Documentation |
Extract one cell from each row (column) of a matrix-like object.
## S4 method for signature 'dgCMatrix' colCollapse(x, idxs, cols = NULL) ## S4 method for signature 'dgCMatrix' rowCollapse(x, idxs, rows = NULL)
x |
An NxK matrix-like object. |
idxs |
An index |
cols |
A |
rows |
A |
The S4 methods for x
of type matrix
,
array
, or numeric
call
matrixStats::rowCollapse
/ matrixStats::colCollapse
.
Returns a numeric
vector
of length N (K).
matrixStats::rowCollapse()
and
matrixStats::colCollapse()
which are used when the input is a matrix
or numeric
vector.
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)