Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

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

dcg_init

Initializes the solver.

Syntax

void
dcg_init
(
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_init
initializes the solver. After initialization, all subsequent invocations of the
Intel® oneAPI Math Kernel Library
 RCI CG routines use the values of all parameters returned by the routine
dcg_init
. Advanced users can skip this step and set the values in the
ipar
 and
dpar
 arrays directly.
You can modify the contents of these arrays after they are passed to the solver routine only if you are sure that the values are correct and consistent. You can perform a basic check for correctness and consistency by calling the
dcg_check
 routine, but it does not guarantee that the method will work correctly.
Input 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 the result of the routine.
ipar
Array of size
128
. Refer to the CG Common Parameters.
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
= -10000
Indicates failure to complete the task.

Product and Performance Information

1

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