From: Uwe Ligges <ligges_at_statistik.tu-dortmund.de>

Date: Thu, 21 Apr 2011 17:10:11 +0200

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Thu 21 Apr 2011 - 15:17:20 GMT

Date: Thu, 21 Apr 2011 17:10:11 +0200

On 21.04.2011 17:08, Maithula Chandrashekhar wrote:

> Thanks Uwe for your insight. However this could not solve my problem.

*> Actually, I meant to define 'Str' in this way:
**>
**>> mat<- matrix(c(1,2,0,2,5,0.5,0,0.5,3), 3, 3)
**>> colnames(mat)<- rownames(mat)<- paste("variable", 1:3, sep="")
**>> mat
**> variable1 variable2 variable3
**> variable1 1 2.0 0.0
**> variable2 2 5.0 0.5
**> variable3 0 0.5 3.0
**>>
**>> Str<- c(paste("variable", 1:4, sep=""), "variable2"); Str
**> [1] "variable1" "variable2" "variable3" "variable4" "variable2"
**>
**> Therefore 'variable2' should appear twice in my modified VCV matrix,
**> which was not there in your suggestion. Is there any better any on how
**> can I do that? or it is really imposable to achieve?
*

It is there twice if the strings and the rownames match.

Uwe

*>
*

> Thanks,

*>
**> 2011/4/21 Uwe Ligges<ligges_at_statistik.tu-dortmund.de>:
**>>
**>>
**>> On 20.04.2011 19:26, Maithula Chandrashekhar wrote:
**>>>
**>>> Dear all, I have special task to expand a given VCV matrix, however
**>>> could not accomplice yet. Let say I have following VCV matrix
**>>>
**>>>> mat<- matrix(c(1,2,0,2,5,0.5,0,0.5,3), 3, 3)
**>>>> colnames(mat)<- rownames(mat)<- paste("variable", 1:3)
**>>>> mat
**>>>
**>>> variable 1 variable 2 variable 3
**>>> variable 1 1 2.0 0.0
**>>> variable 2 2 5.0 0.5
**>>> variable 3 0 0.5 3.0
**>>>
**>>> Now, say I have a general string vector like this:
**>>>
**>>>> Str<- c(paste("variable", 1:4), "variable2")
**>>>> Str
**>>>
**>>> [1] "variable 1" "variable 2" "variable 3" "variable 4" "variable 2"
**>>
**>>
**>>
**>> If Str is like the printed one above rather than the code example, you can
**>> do:
**>>
**>> mat[Str[Str %in% rownames(mat)], Str[Str %in% colnames(mat)]]
**>>
**>> Uwe Ligges
**>>
**>>
**>>
**>>
**>>> Now according to this string, I want my previous VCV matrix also
**>>> expands. Therefore, as "variable 4" is not there in VCV matrix, so it
**>>> will be ignored. Therefore final VCV matrix will be of order 4, and
**>>> will look like:
**>>>
**>>> variable 1 variable 2 variable 3 variable 2
**>>> variable 1 1 2 0 2
**>>> variable 2 2 5 0.5 5
**>>> variable 3 0 0.5 3 0.5
**>>> variable 2 2 5 0.5 5
**>>>
**>>> However, I do not think it is just some straightforward expansion,
**>>> which could be done just by the subsetting mechanism of R. Is there
**>>> any idea on how can I do it for general case?
**>>>
**>>> Thanks for your time,
**>>>
**>>> ______________________________________________
**>>> R-help_at_r-project.org mailing list
**>>> https://stat.ethz.ch/mailman/listinfo/r-help
**>>> PLEASE do read the posting guide
**>>> http://www.R-project.org/posting-guide.html
**>>> and provide commented, minimal, self-contained, reproducible code.
**>>
*

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Thu 21 Apr 2011 - 15:17:20 GMT

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