Unable to use the banded matrix routine

Unable to use the banded matrix routine

by Charley Xu -
Number of replies: 1
Hello,

I am having trouble with the cblas_dbgmv routine.
I've checked my code with the general matrix routine, so I know my matrix formulation is correct.

I've loaded up the banded matrix like this:
General Band Matrix Storage Representation - IBM Documentation



And these are the parameters I feed into the function



When I compare the results of the function with the correct solutions, only some of the elements of the MVP are wrong, most of it is correct.
In reply to Charley Xu

Re: Unable to use the banded matrix routine

by Ramses van Zon -
The IBM documentation is mostly for FORTRAN, and assumes column major layout. For row-major storage, your m and n should be reversed and a should be in stored as a param.ngrid x 3 array.