dcgmrhs_init

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 10/15/2026

Version

Public

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 (oneMKL) 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.

NOTE:

warning

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.

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Developer Reference for Intel® oneAPI Math Kernel Library for C

dcgmrhs_init

Syntax

Include Files

Description

Input Parameters

Output Parameters

Return Values