[R] Standard deviation for rows

Greg Snow Greg.Snow at imail.org
Wed Oct 15 20:23:53 CEST 2008

> apply( mymatrix, 1, sd )

Will give the row standard deviations of a matrix or matrix like data frame.

There are also some functions in add-on packages that do row sd's or var's.

Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Alex99
> Sent: Wednesday, October 15, 2008 11:17 AM
> To: r-help at r-project.org
> Subject: [R] Standard deviation for rows
> Hi everyone,
> I have just started using R, and I have a simple question.
> How can I get the Standard deviation for rows. basically I am looking
> for
> something like  "rowMeans()"
> but for Standard deviation (I tried "rowSds()" didn't exist)
> Thanks,
> --
> View this message in context: http://www.nabble.com/Standard-deviation-
> for-rows-tp19998106p19998106.html
> Sent from the R help mailing list archive at Nabble.com.
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