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Results tagged with blas
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user 28440
Basic Linear Algebra Subprograms - A standard API library with vector-vector, matrix-vector, and matrix-matrix operations.
2
votes
1
answer
215
views
BLAS operation question
The BLAS function dtrmm comes close but cannot handle $B^T$ and also does not compute the sum part. Does anyone see a clever way to compute this with Level 3 BLAS calls? …
- 1,078
1
vote
0
answers
89
views
Fast calculation of $A^T B$
Dense BLAS algorithms often take advantage of blocks of data instead of operating on one row at a time, so my thinking was to do the same (instead of building B one row at a time, build a block of rows …
- 1,078
3
votes
2
answers
240
views
Parallel assembly of matrix
routine for this
sum A[thread_id] over all threads to build final A
When I wrote the code, I had thought that the calculation of $v_k$ and $G_k$ would be the slow parts, since they involve computations (BLAS … I compiled the code below with:
gcc -g -Wall -O2 -fopenmp -o matrix matrix.c -lm -lgsl -lcblas -latlas
Note that the prerequesites to run this are the GSL library and ATLAS BLAS - though you could replace …
- 1,078
4
votes
0
answers
108
views
Block matrix and DSYRK
nblocks}} W_k^T W_k
$$
The reason I set the rows of $W_k$ equal to the vectors $v_i$ and not the columns is because I use C and this way the incX of the rows will be 1 which I think helps to speed up the BLAS …
- 1,078