Developer Reference

Contents

dcg_check

Checks consistency and correctness of the user defined data.

Syntax

void
dcg_check
(
const
MKL_INT
*n
,
const
double
*x
,
const
double
*b
,
MKL_INT
*RCI_request
,
MKL_INT
*ipar
,
double
*dpar
,
double
*tmp
);
Include Files
  • mkl.h
Description
The routine
dcg_check
checks consistency and correctness of the parameters to be passed to the solver routine
dcg
. However this operation does not guarantee that the solver returns the correct result. It only reduces the chance of making a mistake in the parameters of the method. Skip this operation only if you are sure that the correct data is specified in the solver parameters.
The lengths of all vectors must be defined in a previous call to the
dcg_init
routine.
If none of the stopping criteria (
ipar
[7]-
ipar
[9]
) has been enabled, both
ipar
[7] and
ipar
[8]
will be set to 1.
Input Parameters
ipar
Array of size 128. Refer to the FGMRES Common Parameters.
n
Sets the size of the problem.
x
Array of size
n
. Contains the initial approximation to the solution vector. Normally it is equal to 0 or to
b
.
b
Array of size
n
. Contains the right-hand side vector.
Output Parameters
RCI_request
Gives information about result of the routine.
ipar
Array of size
128
. Refer to the CG Common Parameters. Only
ipar
[7]-
ipar
[8]
might be changed
dpar
Array of size
128
. Refer to the CG Common Parameters.
tmp
Array of size
(
n
*
4)
. Refer to the CG Common Parameters.
Return Values
RCI_request
= 0
Indicates that the task completed normally.
RCI_request
= -1100
Indicates that the task is interrupted and the errors occur.
RCI_request
= -1001
Indicates that there are some warning messages.
RCI_request
= -1010
Indicates that the routine changed some parameters to make them consistent or correct.
RCI_request
= -1011
Indicates that there are some warning messages and that the routine changed some parameters.

Product and Performance Information

1

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