colSds | R Documentation |

`colSds`

is a speed optimized `sd`

for matrix or data.frames.
It and treats each line as an independent set of data for calculating the sd (equiv to `apply(dat,1,sd)`

).
NAs are ignored from data.

colSds(dat)

`dat` |
matrix (or data.frame) with numeric values (may contain NAs) |

numeric vector of sd values

`sd`

set.seed(2016); dat1 <- matrix(c(runif(200)+rep(1:10,20)),nc=10) colSds(dat1)

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