From: David Kane <dave_at_kanecap.com>

Date: Wed 11 May 2005 - 00:03:51 EST

*>
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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 Wed May 11 00:11:57 2005

Date: Wed 11 May 2005 - 00:03:51 EST

Is there a simple way to calculate summary statistics for all the
matrices or dataframes in a list? For example:

*> z <- list(matrix(c(2,2,2,2), ncol = 2), matrix(c(4,4,4,4), ncol = 2))
**> z
*

[[1]]

[,1] [,2]

[1,] 2 2

[2,] 2 2

[[2]]

[,1] [,2]

[1,] 4 4

[2,] 4 4

*>
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I would like to calculate, for example, the mean value for each cell. I can do that the hard way as:

[,1] [,2]

[1,] 3 3

[2,] 3 3

*>
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But there must be an easier way. I am also interested in other statistics (like median and sd). Since all my matrices have the same attributes (especially row and column names), I would like to preserve those in the answer.

Thanks,

Dave Kane

In case it matters:

*> R.version
*

_

platform i686-pc-linux-gnu

arch i686 os linux-gnu system i686, linux-gnu status major 2 minor 1.0 year 2005 month 04 day 18 language R

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 Wed May 11 00:11:57 2005

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