Finding CRS format of matrix in Mex

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Abhishek
Abhishek 2012-7-6
Hi,
I am using mex bridge to perform some operations sparse matrices from matlab.One of the operations requires me to convert matrix from CSC to CRS format. I was able to get values and col_indices arrays. However, I am not able to understand the exact method by which I can extract row_pointers array of a given matrix in CSC format.
Any help/suggestions will be appreciated.
Thanks in advance.
Cheers.

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回答（2 个）

James Tursa
James Tursa 2012-7-8
Can't you just transpose it within MATLAB, and then treat the resulting row indexes as column indexes and column "pointers" as row "pointers" in the CRS format?
Abhishek
Abhishek 2012-7-8
Thanks for reply. I have to perform some operation on sparse matrices in CUDA. For that I need first matrix in CRS format. So transposing it might increase the runtime since I have to deal with sparse matrices with million non zeros. I think I will have to use some library that might help in finding the CSR format.
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Abhishek
Abhishek 2012-7-8
James,
Yes I am fully aware of the reversal of roles of col_ptrs into row_ptrs and row_indices into col_indices when we transpose it. What I want is to transpose it inside the mex routine that I am writing. And yes there are facilities in CUDA that I have tried which allow us to change the format from CSC to CSR. cuSPARSE and CUSP are two such examples of libraries.I guess, I will have to use one of them.
Thanks again.
James Tursa
James Tursa 2012-7-8
You can use mexCallMATLAB with your MATLAB variable as the input and call the "transpose" function.

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