From: Marc Schwartz <MSchwartz_at_medanalytics.com>

Date: Tue 11 Jan 2005 - 15:03:36 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jan 11 14:13:16 2005

Date: Tue 11 Jan 2005 - 15:03:36 EST

On Mon, 2005-01-10 at 22:45 -0500, Thomas Hopper wrote:

> Hello,

*>
**> I've got an array defined as y <- rnorm(3000), dim(y) <- c(3, 1000).
**>
**> I'd like to produce a 1000-element vector z that is the mean of the
**> corresponding elements of y (like z[1,1] <- mean(y[1,1], y[2,1],
**> y[3,1])), but being new to R, I'm not sure how to do this for all
**> elements at once (or, at least, simply). Any help is appreciated.
**>
**> Thanks,
**>
**> Tom
*

# You can create 'y' in one step here

y <- matrix(rnorm(3000), ncol = 1000)

# get the column means

z <- colMeans(y)

> str(z)

num [1:1000] -0.5664 0.8232 -0.0138 -0.5511 1.0224 ...

See ?colMeans for more info.

**HTH,
**
Marc Schwartz

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jan 11 14:13:16 2005

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