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accessing dimension names
4 messages · A, PIKAL Petr, jim holtman +1 more
Hi r-help-bounces at r-project.org napsal dne 18.12.2007 12:01:41:
I have a matrix y:
dimnames(y)
$x93 [1] "1" "2" $x94 [1] "0" "1" "2" .................. so on (there are other dimensions as well) I need to access a particular dimension, but a random mechanism tells me which dimension it would. So, sometimes I might need to access dimnames(y)$x93, some other time it would be dimnames(y)$x94.. and so
on.
Now let that random dimension be idx, then
dimnames(y)$paste('x',idx,sep='')
doesn't work.
Why not dimnames(y)[idx] Regards Petr
Can anyone help? Thanks! [[alternative HTML version deleted]]
______________________________________________ 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.
dimnames(y)[[paste('x', idx, sep="")]]
On Dec 18, 2007 6:01 AM, <born.to.b.wyld at gmail.com> wrote:
I have a matrix y:
dimnames(y)
$x93
[1] "1" "2"
$x94
[1] "0" "1" "2"
.................. so on (there are other dimensions as well)
I need to access a particular dimension, but a random mechanism tells me
which dimension it would. So, sometimes I might need to access
dimnames(y)$x93, some other time it would be dimnames(y)$x94.. and so on.
Now let that random dimension be idx, then dimnames(y)$paste('x',idx,sep='')
doesn't work.
Can anyone help?
Thanks!
[[alternative HTML version deleted]]
______________________________________________ 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.
Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve?
To access your dimension idx you could do either
assign("a",paste("dimnames(y)$x",idx,sep=""))
or
eval(parse(text=paste("a<-dimnames(y)$x",idx,sep="")))
--- born.to.b.wyld at gmail.com wrote:
I have a matrix y:
dimnames(y)
$x93
[1] "1" "2"
$x94
[1] "0" "1" "2"
.................. so on (there are other
dimensions as well)
I need to access a particular dimension, but a
random mechanism tells me
which dimension it would. So, sometimes I might need
to access
dimnames(y)$x93, some other time it would be
dimnames(y)$x94.. and so on.
Now let that random dimension be idx, then
dimnames(y)$paste('x',idx,sep='')
doesn't work.
Can anyone help?
Thanks!
[[alternative HTML version deleted]]
______________________________________________ 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.