I meant "sparse matrix", sorry for the typo.
Feng
On Sat, Jan 29, 2011 at 7:02 PM, Feng Li wrote:
> Dear R,
>
> I have a simple question concerning with a special case of sparse matrix
> multiplications. Say A is a 200-by-1 dense matrix. B is a 1-by-1
> block- diagonal matrix, and e
Dear R,
I have a simple question concerning with a special case of spare matrix
multiplications. Say A is a 200-by-1 dense matrix. B is a 1-by-1
block- diagonal matrix, and each diagonal block B_i is 100-by-100. The usual
way I did A%*%B will take about 30 seconds which is to time cons
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