matrixStats (version 1.4.1)

rowCumsums: Cumulative sums, products, minima and maxima for each row (column) in a matrix

Description

Cumulative sums, products, minima and maxima for each row (column) in a matrix.

Usage

rowCumsums(x, rows = NULL, cols = NULL, dim. = dim(x), ...,
  useNames = TRUE)
colCumsums(x, rows = NULL, cols = NULL, dim. = dim(x), ...,
  useNames = TRUE)
rowCumprods(x, rows = NULL, cols = NULL, dim. = dim(x), ...,
  useNames = TRUE)
colCumprods(x, rows = NULL, cols = NULL, dim. = dim(x), ...,
  useNames = TRUE)
rowCummins(x, rows = NULL, cols = NULL, dim. = dim(x), ...,
  useNames = TRUE)
colCummins(x, rows = NULL, cols = NULL, dim. = dim(x), ...,
  useNames = TRUE)
rowCummaxs(x, rows = NULL, cols = NULL, dim. = dim(x), ...,
  useNames = TRUE)
colCummaxs(x, rows = NULL, cols = NULL, dim. = dim(x), ...,
  useNames = TRUE)

Value

Returns a numeric NxK matrix

of the same mode as x, except when x is of mode logical, then the return type is integer.

Arguments

x

An NxK matrix or, if dim. is specified, an N * K vector.

rows

A vector indicating subset of rows to operate over. If NULL, no subsetting is done.

cols

A vector indicating subset of columns to operate over. If NULL, no subsetting is done.

dim.

An integer vector of length two specifying the dimension of x, also when not a matrix. Comment: The reason for this argument being named with a period at the end is purely technical (we get a run-time error if we try to name it dim).

...

Not used.

useNames

If TRUE (default), names attributes of the result are set, otherwise not.

Author

Henrik Bengtsson

See Also

See cumsum(), cumprod(), cummin(), and cummax().

Examples

x <- matrix(1:12, nrow = 4, ncol = 3)
print(x)

yr <- rowCumsums(x)
print(yr)

yc <- colCumsums(x)
print(yc)

yr <- rowCumprods(x)
print(yr)

yc <- colCumprods(x)
print(yc)

yr <- rowCummaxs(x)
print(yr)

yc <- colCummaxs(x)
print(yc)

yr <- rowCummins(x)
print(yr)

yc <- colCummins(x)
print(yc)