> "GC" == Gray Calhoun
> on Mon, 14 Dec 2009 19:26:44 -0600 writes:
GC> Check out crossprod and the Matrix package (capitalized); there's also
GC> a discussion of their speed gains in the R newsletter that should turn
GC> up with a search and in the vignette as well.
Yes,
Check out crossprod and the Matrix package (capitalized); there's also
a discussion of their speed gains in the R newsletter that should turn
up with a search and in the vignette as well.
-Gray
On Monday, December 14, 2009, parkbomee wrote:
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> Hi all,
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> Is there a way to do a matrix
Hi all,
Is there a way to do a matrix multiplication in a faster way?
I am making a product of a matrix (composed of a lot of dummy variables) and a
vector, and is there any way to make it faster?
The simple X %*% y takes too long a time.
I know using sparse matrix would help, but don't kno
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