Intel® oneAPI Math Kernel Library Developer Reference - Fortran
Replaces routine which handles Intel® oneAPI Math Kernel Library PARDISO pivots with user-defined routine.
call mkl_pardiso_pivot (ai, bi, eps)
The mkl_pardiso_pivotroutine allows you to handle diagonal elements which arise during numerical factorization that are zero or near zero. By default, Intel® oneAPI Math Kernel Library PARDISO determines that a diagonal elementbi is a pivot if bi < eps, and if so, replaces it with eps. But you can provide your own routine to modify the resulting factorized matrix in case there are small elements on the diagonal during the factorization step.
To use this routine, you must set iparm(56) to 1 before the main pardiso loop.
This routine is only available for in-core Intel® oneAPI Math Kernel Library PARDISO.
DOUBLE PRECISION - for real types of matrices (mtype=2, -2, 4, and 6) and for double precision Intel® oneAPI Math Kernel Library PARDISO (iparm(28)=0)
Diagonal element of initial matrix corresponding to pivot element.
DOUBLE PRECISION - for real types of matrices (mtype=2, -2, 4, and 6) and for double precision Intel® oneAPI Math Kernel Library PARDISO (iparm(28)=0)
Diagonal element of factorized matrix that could be chosen as a pivot element.
DOUBLE PRECISION
Scalar to compare with diagonal of factorized matrix. On input equal to parameter described by iparm(10).
In case element is chosen as a pivot, value with which to replace the pivot.