Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

Contents

dcgmrhs_init

Initializes the RCI CG solver with MHRS.

Syntax

void
dcgmrhs_init
(
const
MKL_INT
*n
,
const
double
*x
,
const
MKL_INT
*nrhs
,
const
double
*b
,
const
MKL_INT
*method
,
MKL_INT
*RCI_request
,
MKL_INT
*ipar
,
double
*dpar
,
double
*tmp
);
Include Files
  • mkl.h
Description
The routine
dcgmrhs_init
initializes the solver. After initialization all subsequent invocations of the
Intel® oneAPI Math Kernel Library
 RCI CG with multiple right-hand sides (MRHS) routines use the values of all parameters that are returned by
dcgmrhs_init
. Advanced users may skip this step and set the values to these parameters directly in the appropriate routines.
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
dcgmrhs_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
*
nrhs
. Contains the initial approximation to the solution vectors. Normally it is equal to 0 or to
b
.
nrhs
Sets the number of right-hand sides.
b
Array of size
n
*
nrhs
. Contains the right-hand side vectors.
method
Specifies the method of solution:
A value of 1 indicates CG with multiple right-hand sides (default value)
Output Parameters
RCI_request
Gives information about the result of the routine.
ipar
Array of size
(128+2*
nrhs
)
. Refer to the CG Common Parameters.
dpar
Array of size
(128+2*
nrhs
)
. Refer to the CG Common Parameters.
tmp
Array of size
(
n
*
(3+
nrhs
))
. 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.