[R] Create Strings of Column Id's

[jim holtman]

Is this what you want:

> paste("-", paste(colnames(MyMatrix)[COL], collapse='-'), sep='')
[1] "-E-T"


On 7/26/07, Tom.O <tom.olsson at dnbnor.com> wrote:
>
> Does anyone know how this is don?
>
> I have a large matrix where I extract specific columns into txt files for
> further use. To be able to keep track of which txt files contain which
> columns I want to name the filenames with the column Id's.
>
> The most basic example would be to use an for() loop together with paste(),
> but the result is blank. Not even NULL.
>
> this is the concept of thecode i use:
>
> for example
>
> MyMatrix <- matrix(NA,ncol=4,nrow=1,dimnames=list(NULL,c("E","R","T","Y")))
> COL <- c(1,3) # a vector of columns I want to extract,
>
> Filename <- NULL # the starting variable, so I can use paste
> Filename <- for(i in colnames(MyMatrix)[COL]) {paste(Filename,"-",i,sep="")}
>
> The result is "-T", but I want it to be "-E-T"
>
> Anyone have a clue?
>
> Thanks Tom
>
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?