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 |
rows , cols |
A |
... |
Additional arguments passed to specific methods. |
useNames |
If |
dim. |
An |
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
-
matrixStats::rowCollapse()
andmatrixStats::colCollapse()
which are used when the input is amatrix
ornumeric
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)