From: Patrick Burns <pburns_at_pburns.seanet.com>

Date: Sat 08 Oct 2005 - 06:29:13 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 Sat Oct 08 06:39:40 2005

Date: Sat 08 Oct 2005 - 06:29:13 EST

If there weren't an analytic solution to your problem, then you could build a vector of the answers from 1 to the maximum in the matrix. Call that 'wtvec'. Then:

ans <- array(NA, dim(A), dimnames(A))

ans[] <- wtvec[as.vector(A)]

should get you what you want.

Patrick Burns

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")

Tim Smith wrote:

*>Hi,
**>
*

>I have a 7000x7000 matrix, and each element is an integer. For each element, I want to apply the function :

*>
**>wt <- 0
**> for(q in 1:count){
**> wt <- wt + 0.5^(q-1)
**>}
**>
**>I get the value of 'count' from the elements in the matrix , and want to store the corresponding 'wt' value for that element.
**>
**>I suppose I could loop through the matrix, and apply the function to each element but this would take a really really long time. Are there any quicker ways to get the same result?
**>
**>many thanks,
**>
**>Tim
**>
**>
**>---------------------------------
**>
**>
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**>
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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 Sat Oct 08 06:39:40 2005

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