Hi,
Recently I've been trying to use mkl_sparse_?_qr_qmult to extract the Q matrix by multiplying Q^-1 by an identity matrix. However this function has been returning SPARSE_STATUS_NOT_SUPPORTED. I suspect this is because the matrix dimensions I set don't make sense. I tried to follow the documentation however the link below is quite confusing to me.
https://software.intel.com/en-us/mkl-developer-reference-c-mkl-sparse-qr...
Basically, after factorizing A_{mn} where m > n, I want to multiply the factorization result Q_{mm}^{-1} by the identity matrix I_{mm} so that the x matrix contains Q^-1. However the documentation says, if row major, the number of rows of x should be the number of columns of A, which is n.
Is what I want to do achievable? Could you help explain how does mkl_sparse_?_qr_qmult work?
Thanks,
Yilong