Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

mkl_pardiso_pivot

Replaces routine which handles
Intel® oneAPI Math Kernel Library
 PARDISO pivots with user-defined routine.

Syntax

void
mkl_pardiso_pivot
(
const
void *
ai
,
void
*
bi
,
const
void
*
eps
);
Include Files
  • mkl.h
Description
The
mkl_pardiso_pivot
routine 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 element
bi
 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
[55]
 to 1 before the main
pardiso
 loop.
Input Parameters
ai
Diagonal element of initial matrix corresponding to pivot element.
bi
Diagonal element of factorized matrix that could be chosen as a pivot element.
eps
Scalar to compare with diagonal of factorized matrix. On input equal to parameter described by
iparm
[9]
.
Output Parameters
bi
In case element is chosen as a pivot, value with which to replace the pivot.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.