colVars: Column and row-wise variances and standard deviations of a...

Description Usage Arguments Details Value Author(s) See Also Examples

View source: R/Var.R

Description

Column and row-wise variances and standard deviations of a matrix

Usage

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colVars(x, suma = NULL, std = FALSE, na.rm = FALSE, parallel = FALSE)
rowVars(x, suma = NULL, std = FALSE, na.rm = FALSE, parallel = FALSE)

Arguments

x

A matrix with the data.

suma

If you already have the column sums vector supply it, otherwise leave it NULL. Depricated.

std

A boolean variable specyfying whether you want the variances (FALSE) or the standard deviations (TRUE) of each column.

na.rm

TRUE or FAlSE for remove NAs if exists.

parallel

Should parallel implentations take place in C++? The default value is FALSE.

Details

We found this on stackoverflow which was created by David Arenburg. We then modified the function to match the sums type formula of the variance, which is faster.

Value

A vector with the column variances or standard deviations.

Author(s)

Michail Tsagris

R implementation and documentation: Michail Tsagris <mtsagris@uoc.gr> and Manos Papadakis <papadakm95@gmail.com>.

See Also

colmeans, colMedians, colrange

Examples

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x <- matrix( rnorm(100 * 100), ncol = 100 )
a2 <- colVars(x)
x<-a2<-NULL

Example output

Loading required package: Rcpp
Loading required package: RcppZiggurat

Rfast documentation built on May 18, 2021, 1:07 a.m.