[R] assign names to matrix

Pan_Yuming@aam.de Pan_Yuming at aam.de
Thu Nov 16 17:52:42 CET 2000


Thanks for your advice.

My interest is to how to refer to each column as if it is a variable. i
solved this problem by
dimnames(v) <- list(1:nrow(v),label)
v <- as.data.frame(v)

now i can refer to column 1 of v as v$A...

regards
Pan Yuming





Thomas Lumley <thomas at biostat.washington.edu> on 16.11.2000 17:11:25

To:   Pan_Yuming at aam.de
cc:   r-help at stat.math.ethz.ch

Subject:  Re: [R] assign names to matrix


On Thu, 16 Nov 2000 Pan_Yuming at aam.de wrote:

>
>
> dear all,
>
> i have a matrix and i dont know how to assign names to this matrix.
>
> given v is 100x5 matrix, and label -> c("A","B","C","D","E")
>
> idealy, names(v) <- label, but it doesnt work for different length
>
> if dimnames(v) <- list(1:nrow(v),label), then names(v) return NULL
>
> any smart ways? thanks in advance.

Lists have names(). Matrices don't have names(). They have dimnames() (or
colnames() and rownames()). You want to use dimnames instead.

     -thomas

Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle




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