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.
best regards
pan yuming
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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 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
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 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._