colScale: Column Centering and Scaling

In muschellij2/msseg: Segmentation of Lesions for Multiple Sclerosis

Description

This function is a fast way to scale columns of a matrix

Usage

colScale(x, center = TRUE, scale = TRUE, add_attr = TRUE, rows = NULL,
  cols = NULL, na.rm = TRUE, ...)

Arguments

x	numeric matrix
center	Should the columns be centered
scale	Should the columns be scaled
add_attr	Add the center/scale attributes
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.
na.rm	If TRUE, missing values are removed first, otherwise not.
...	Arguments to pass to rowSds

Value

Matrix of centered/scaled values

Examples

x = matrix(rnorm(10*1000, mean = 4, sd = 5), ncol = 10)
cx = colScale(x)
all(abs(colMeans(cx)) < 1e-8)
all(abs(matrixStats::colSds(cx) - 1) < 1e-8)

muschellij2/msseg documentation built on May 23, 2019, 9:53 a.m.