Re: [R] Taking all "complete" diagonals of a matrix

;>> From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- >>> project.org] On Behalf Of Peter Lomas >>> Sent: Tuesday, July 19, 2011 2:16 PM >>> To: r-help@r-project.org >>> Subject: [R] Taking all "complete" diagonals of a matrix >>>

Re: [R] Taking all "complete" diagonals of a matrix

> -Original Message- > From: Peter Lomas [mailto:peter.lo...@ucalgary.ca] > Sent: Tuesday, July 19, 2011 6:42 PM > To: Nordlund, Dan (DSHS/RDA) > Cc: r-help@r-project.org > Subject: Re: [R] Taking all "complete" diagonals of a matrix > > Thanks very mu

Re: [R] Taking all "complete" diagonals of a matrix

On Tue, Jul 19, 2011 at 17:34, Nordlund, Dan (DSHS/RDA) wrote: >> -Original Message- >> From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- >> project.org] On Behalf Of Peter Lomas >> Sent: Tuesday, July 19, 2011 2:16 PM >> To: r-help@r-project.org >>

Re: [R] Taking all "complete" diagonals of a matrix

Hi: Does this work for you? mydiags <- function(mat) diag(mat[seq_len(ncol(mat)), ]) # Example: set.seed(103) u <- matrix(rpois(200, 10), ncol = 10) # > dim(u) # [1] 20 10 mydiags(u) # [1] 7 12 6 13 12 6 5 6 14 6 u[1:10, ] # as a double check HTH, Dennis On Tue, Jul 19, 2011 at 2:15

Re: [R] Taking all "complete" diagonals of a matrix

> -Original Message- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Peter Lomas > Sent: Tuesday, July 19, 2011 2:16 PM > To: r-help@r-project.org > Subject: [R] Taking all "complete" diagonals of a matrix > > H

[R] Taking all "complete" diagonals of a matrix

Hi R-Help! I am trying to find a nicer way of extracting all the "complete" diagonals of a matrix. I am working with very large matrices that have many more rows than columns. I want to be able to extract each of the diagonals that are as long as the number of columns in the matrix. I have writ