I'm a bit clumsy about many things in R. Here's my problem. I'm trying
to build a square sparse matrix and populate it without looping (bad
practice, right). I have vectors of matched row/column pairs for which
the matrix entries have common characteristics and am look for a way to
fill the
On Mon, Mar 19, 2012 at 2:07 PM, David Stevens david.stev...@usu.edu wrote:
I'm a bit clumsy about many things in R. Here's my problem. I'm trying to
build a square sparse matrix and populate it without looping (bad practice,
right). I have vectors of matched row/column pairs for which the
http://cran.r-project.org/doc/manuals/R-lang.html#Indexing-matrices-and-arrays
matrix[cbind(iRows, iCols)] - values
Peter
On Mon, Mar 19, 2012 at 2:07 PM, David Stevens david.stev...@usu.eduwrote:
I'm a bit clumsy about many things in R. Here's my problem. I'm trying to
build a square sparse
I suspect I'm misinterpreting what you are trying to do, because it
seems unlikely that the solution is as simple as:
A - matrix(0, 20, 20)
iRows - c(2,3,4,6,7,8,10,11,12,14,15,16,18,19)
iCols - c(1,2,3,5,6,7,9,10,11,13,14,15,17,18)
A[iRows, iCols] - 1 # or a vector of the same length in the same
On 19-03-2012, at 22:07, David Stevens wrote:
I'm a bit clumsy about many things in R. Here's my problem. I'm trying to
build a square sparse matrix and populate it without looping (bad practice,
right). I have vectors of matched row/column pairs for which the matrix
entries have common
Please folks!
Why issue protestations of clumsiness when all you have to do is
make some effort to learn R?
See section 5.3 of an Intro to R -- which ships with every copy of R
-- on matrix indexing.
?[
also documents the behavior, albeit more tersely. (... a third form
of indexig ...)
(ergo
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