topic Thanks for the problem Sergey in Intel® oneAPI Math Kernel Library

Incorrect band matrix storage description

gololobov__sergey — Wed, 02 Oct 2019 12:27:58 GMT

In MKL C Manual on page 399 (PDF) row major layout formula looks like "row major layout: k(i, j) = (i - j)*ldab + kl + j - 1; 1 ≤i≤m, max(1, i - kl) ≤j≤ min(n, i + ku)". Let's take row i=1, j=i+ku, kl=ku=k (equal # of bands), ldab=kl + ku + 1 as suggested earlier and get k(i,j)=-k*(k+k+1)+k+1+k-1=k-2*k*k, which is negative for all k>0. Please adjust to make it correct. Thank you!

Thanks for the problem Sergey

Gennady_F_Intel — Fri, 04 Oct 2019 09:04:23 GMT

Thanks for the problem Sergey, we will check and address the case.

Sergey, I have no pdf doc

Gennady_F_Intel — Fri, 04 Oct 2019 12:47:15 GMT

Sergey, I have no pdf doc file available right now. Could you point us the function name you are talking about? We will check then this description from within html format.

sorry, I see what you mean.

Gennady_F_Intel — Fri, 04 Oct 2019 14:27:47 GMT

sorry, I see what you mean. Thanks, the case will be escalated and we will update this thread when the fix of the problem will be available.

Sergey, the issue is fixed in

Gennady_F_Intel — Wed, 01 Apr 2020 09:20:46 GMT

Sergey, the issue is fixed in MKL 2020 u1.

Thank you very much, Gennady!

gololobov__sergey — Thu, 23 Apr 2020 04:17:04 GMT

Thank you very much, Gennady!