Hello list, I am creating sparse matrices using the SparseM package. These sparse structures are to be used as a basis for (a number of) distance matrices. But in order to create thoses, I must be able to read the elements/rows/columns of the sparse structures in order to operate on them. Thus, how to go from sparse matrix to (sparse) rows, columns? Must I create the functions myself or am I not reading the obvious in the documentation? Thanks in advance, Renald
Sparse matrix row/column access (SparseM)?
3 messages · Renald Buter, Roger Koenker
Given a matrix in any of the SparseM forms, you can access columns and rows with the usual R subsetting conventions, e.g. A[,k] gives the kth column, A[m,] gives the mth row... As a general principle, questions about packages should probably be directed first to package maintainers (in this case me) and only in cases of non-response to r-help. url: www.econ.uiuc.edu/~roger/my.html Roger Koenker email rkoenker at uiuc.edu Department of Economics vox: 217-333-4558 University of Illinois fax: 217-244-6678 Champaign, IL 61820
On Fri, 16 Jan 2004, Renald Buter wrote:
Hello list, I am creating sparse matrices using the SparseM package. These sparse structures are to be used as a basis for (a number of) distance matrices. But in order to create thoses, I must be able to read the elements/rows/columns of the sparse structures in order to operate on them. Thus, how to go from sparse matrix to (sparse) rows, columns? Must I create the functions myself or am I not reading the obvious in the documentation? Thanks in advance, Renald
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On Fri, Jan 16, 2004 at 02:55:05PM -0600, Roger Koenker wrote:
Given a matrix in any of the SparseM forms, you can access columns and rows with the usual R subsetting conventions, e.g. A[,k] gives the kth column, A[m,] gives the mth row...
*blush* Couln't be more simpler. Thank you.
As a general principle, questions about packages should probably be directed first to package maintainers (in this case me) and only in cases of non-response to r-help.
My apologies. I was not aware of this convention. Regards, Renald