dave mitchell wrote: > Dear all, > Possibly a rudimentary question, however any help is greatly appreciated. I > am sorting a large matrix into an array of dim(p(i),q,3). I put each entry > into a corresponding matrix (1 of the 3) based on some criteria. I figure > this will assist me in condensing code as I can loop through the 3rd > dimension of the array instead of generating 3 separate matrices and using > the same block of code 3 times. My question is how to get the colnames of > the 3 nested matrices in the array to match the colnames of the data > matrix. In other words... > Denoting with array3d the array and with matrix2d the data matrix:
colnames(array3d)=colnames(array3d) Otherwise, using dimnames: dimnames(array3d)=list(NULL,colnames(array3d),NULL) You can operate using the "[" operator, that is: array3d[,"region",] to extract the region columns from each dimension. You obtain the same effect using the column number, i.e. array3d[,2,] domenico > DATA: > Exp region Qty Ct ...q > 1 S CB 3.55 2.15 . > 2 S TG 4.16 2.18 . > 3 C OO 2.36 3.65 . > 4 C . . . > . . . . . > . . . . . > . . . . . > p ........................... > > > > ARRAY > 1 > [,1] [,2] [,3] [,4]...q > 1 SOME DATA WILL FILL THIS . > 2 . . . . > 3 . . . . > 4 . . . . > . . . . . > . . . . . > . . . . . > P(1) ........................... > > 2 > [,1] [,2] [,3] [,4]...q > 1 SOME DATA WILL FILL THIS . > 2 . . . . > 3 . . . . > 4 . . . . > . . . . . > . . . . . > . . . . . > P(2) ........................... > 3 > [,1] [,2] [,3] [,4]...q > 1 SOME DATA WILL FILL THIS . > 2 . . . . > 3 . . . . > 4 . . . . > . . . . . > . . . . . > . . . . . > P(3) ........................... > > Again, how to get those [,1], [,2]... to read (and operate) in the same > fashion as the column names in the data matrix? Also, am I interpreting the > dimensions of the array incorrectly? Please feel free to post any helpful > links on the subject, as I have found "dimnames" and "array" in the R-help > documentation unhelpful. Any help is greatly appreciated. > > Dave Mitchell > Undergraduate: Statistics and Mathematics, > University of Illinois, Urbana-Champaign > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@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. > > ______________________________________________ R-help@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.
