colSds function

Row and column standard deviations

The rowSds and colSds respectively computes the standard deviations of each rows and columns of the given matrix.

colSds(x)

rowSds(x)

Arguments

• x: A numeric matrix of size n times m

Returns

colSds returns a numeric vector of length m.

rowSds returns a numeric vector of length n.

Examples

x <- matrix(rnorm(50), 10, 5)
GMCM:::colSds(x)
apply(x, 2, sd)  # slower equivalent code
y <- matrix(rnorm(50), 10, 5)
GMCM:::rowSds(y)

See Also

rowMeans, colMeans

Author(s)

Anders Ellern Bilgrau anders.ellern.bilgrau@gmail.com