CSC To CSR Matrix Conversion

[badlishah]

Greetings,

Would there be simple way to convert vectors from a CSC matrix to the CSR format? Anyway I can manipulate the indexing?

cheers,
Badlishah

[mgates3]

Try magma_zmtranspose.
-mark

[jeanfell]

I was looking for the same answer, magma_zmtranspose didn't work for me btw. Thanks Mark.

[badlishah]

Thank you Mark. That tip was very helpful. Apologies for my ignorance, I am still new in this field :)

How would I actually change the indices used in the matrix? For example in the CUDA CuSparse library there is the CUSPARSE_INDEX_BASE_ZERO and CUSPARSE_INDEX_BASE_ONE that can be used.

Cheers,
Badlishah

[hartwig anzt]

Badlishah,

There is no function for this at this point (all MAGMA sparse is using 0-based indexing). At this point, I would do this manually on the CPU:

for( magma_int_t i=0; i<A.num_rows+1; i++) {
A.row += 1;
}

for( magma_int_t i=0; i<A.nnz; i++) {
A.col += 1;
}

Please let me know if you have problems, then I can provide you with a function.

Thanks, Hartwig

[badlishah]

Hartwig,

That worked well. Thanks a bundle.

cheers,
Badlishah