From: Patrick Burns <pburns_at_pburns.seanet.com>

Date: Wed 11 May 2005 - 00:49:38 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 Wed May 11 00:56:12 2005

Date: Wed 11 May 2005 - 00:49:38 EST

Burns Statistics

patrick@burns-stat.com

+44 (0)20 8525 0696

http://www.burns-stat.com

(home of S Poetry and "A Guide for the Unwilling S User")

David Kane wrote:

>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
**>
**>
**>
**>I would like to calculate, for example, the mean value for each
**>cell. I can do that the hard way as:
**>
**>
**>
**>>(z[[1]] + z[[2]]) / 2
**>>
**>>
**> [,1] [,2]
**>[1,] 3 3
**>[2,] 3 3
**>
**>
**>
**>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
**>
**>
**>
**>
**>
*

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 00:56:12 2005

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