[in] | trans | Intended usage: = PlasmaNoTrans: the linear system involves A; = PlasmaConjTrans: the linear system involves A**H. Currently only PlasmaNoTrans is supported. |
[in,out] | A |
- If the iterative refinement converged, A is not modified;
- otherwise, it fell back to double precision solution, and on exit the M-by-N matrix A contains: if M >= N, A is overwritten by details of its QR factorization as returned by PLASMA_zgeqrf; if M < N, A is overwritten by details of its LQ factorization as returned by PLASMA_zgelqf.
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[out] | T | On exit:
- if the iterative refinement converged, T is not modified;
- otherwise, it fell back to double precision solution, and then T is an auxiliary factorization data.
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[in,out] | B | On entry, the M-by-NRHS matrix B of right hand side vectors, stored columnwise; On exit, if return value = 0, B is overwritten by the solution vectors, stored columnwise: if M >= N, rows 1 to N of B contain the least squares solution vectors; the residual sum of squares for the solution in each column is given by the sum of squares of the modulus of elements N+1 to M in that column; if M < N, rows 1 to N of B contain the minimum norm solution vectors; |
[in] | B | The descriptor of the M-by-NRHS matrix B of right hand side vectors, stored columnwise. Not modified. |
[in,out] | X | On entry, it's only the descriptor where to store the result. On exit, if return value = 0, X is the solution vectors, stored columnwise: if M >= N, rows 1 to N of X contain the least squares solution vectors; the residual sum of squares for the solution in each column is given by the sum of squares of the modulus of elements N+1 to M in that column; if M < N, rows 1 to N of X contain the minimum norm solution vectors; |
[out] | ITER | If > 0, ITER is the number of the current iteration in the iterative refinement process. -ITERMAX-1, if the refinment step failed and the double precision factorization has been used. |