Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

Contents

dfgmres_get

Retrieves the number of the current iteration and updates the solution.

Syntax

void
dfgmres_get
(
const
MKL_INT
*n
,
double
*x
,
double
*b
,
MKL_INT
*RCI_request
,
const
MKL_INT
*ipar
,
const
double
*dpar
,
double
*tmp
,
MKL_INT
*itercount
);
Include Files
  • mkl.h
Description
The routine
dfgmres_get
 retrieves the current iteration number of the solution process and updates the solution according to the computations performed by the
dfgmres
 routine. To retrieve the current iteration number only, set the parameter
ipar
[12]
= -1 beforehand. Normally, you should do this before proceeding further with the computations. If the intermediate solution is needed, the method parameters must be set properly. For details see FGMRES Common Parametersand the Iterative Sparse Solver code examples in the
Intel® oneAPI Math Kernel Library
 installation directory:
  • examples/solverc/source
Input Parameters
n
Sets the size of the problem.
ipar
Array of size
128
. Refer to the FGMRES Common Parameters.
dpar
Array of size
128
. Refer to the FGMRES Common Parameters.
tmp
Array of size
((2*
ipar
[14]+1)*
n
+
ipar
[14]*
ipar
[14]+9)/2 + 1)
. Refer to the FGMRES Common Parameters.
Output Parameters
x
Array of size
n
. If
ipar
[12]
= 0, it contains the updated approximation to the solution according to the computations done in
dfgmres
 routine. Otherwise, it is not changed.
b
Array of size
n
. If
ipar
(13)
> 0, it contains the updated approximation to the solution according to the computations done in
dfgmres
 routine. Otherwise, it is not changed.
RCI_request
Gives information about result of the routine.
itercount
Contains the value of the current iteration number.
Return Values
RCI_request
= 0
Indicates that the task completed normally.
RCI_request
= -12
Indicates that the routine was interrupted because errors were found in the routine parameters. Usually this happens if the parameters
ipar
 and
dpar
 were altered by mistake outside of the routine.
RCI_request
= -10000
Indicates that the routine failed to complete the task.

Product and Performance Information

1

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