example_sgetrs.c File Reference

Example for solving a system of linear equations using LU factorization. More...

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <plasma.h>
#include <cblas.h>
#include <lapacke.h>
#include <core_blas.h>

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Functions
int	check_solution (int, int, float *, int, float *, float *, int)
int	main ()

Variables
int	IONE = 1
int	ISEED [4] = {0,0,0,1}

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Detailed Description

Example for solving a system of linear equations using LU factorization.

PLASMA testing routines PLASMA is a software package provided by Univ. of Tennessee, Univ. of California Berkeley and Univ. of Colorado Denver

Version:

2.4.5

Author:

Bilel Hadri

Date:

2010-11-15 s Tue Nov 22 14:35:53 2011

Definition in file example_sgetrs.c.

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Function Documentation

int check_solution	(	int	N,
		int	NRHS,
		float *	A1,
		int	LDA,
		float *	B1,
		float *	B2,
		int	LDB
	)

int main

(

)

Definition at line 32 of file example_sgetrs.c.

References check_solution(), IONE, IPIV, ISEED, L, PLASMA_Alloc_Workspace_sgetrf_incpiv(), PLASMA_Finalize(), PLASMA_Init(), PLASMA_sgetrf_incpiv(), PLASMA_sgetrs_incpiv(), and PlasmaNoTrans.

{

    int cores = 2;
    int N     = 10;
    int LDA   = 10;
    int NRHS  = 5;
    int LDB   = 10;
    int info;
    int info_solution;
    int i,j;
    int LDAxN = LDA*N;
    int LDBxNRHS = LDB*NRHS;

    float *A1 = (float *)malloc(LDA*N*(sizeof*A1));
    float *A2 = (float *)malloc(LDA*N*(sizeof*A2));
    float *B1 = (float *)malloc(LDB*NRHS*(sizeof*B1));
    float *B2 = (float *)malloc(LDB*NRHS*(sizeof*B2));
    float *L;
    int *IPIV;

    /* Check if unable to allocate memory */
    if ((!A1)||(!A2)||(!B1)||(!B2)){
        printf("Out of Memory \n ");
        return EXIT_SUCCESS;
    }

    /*Plasma Initialize*/
    PLASMA_Init(cores);
    printf("-- PLASMA is initialized to run on %d cores. \n",cores);

    /* Initialize A1 and A2 Matrix */
    LAPACKE_slarnv_work(IONE, ISEED, LDAxN, A1);
    for ( i = 0; i < N; i++)
        for (  j = 0; j < N; j++)
            A2[LDA*j+i] = A1[LDA*j+i];

    /* Initialize B1 and B2 */
    LAPACKE_slarnv_work(IONE, ISEED, LDBxNRHS, B1);
    for ( i = 0; i < N; i++)
        for ( j = 0; j < NRHS; j++)
            B2[LDB*j+i] = B1[LDB*j+i];


    /* Allocate L and IPIV */
    info = PLASMA_Alloc_Workspace_sgetrf_incpiv(N, N, &L, &IPIV);

    /* LU factorization of the matrix A */
    info = PLASMA_sgetrf_incpiv(N, N, A2, LDA, L, IPIV);

    /* Solve the problem */
    info = PLASMA_sgetrs_incpiv(PlasmaNoTrans, N, NRHS, A2, LDA, L, IPIV, B2, LDB);

    /* Check the solution */
    info_solution = check_solution(N, NRHS, A1, LDA, B1, B2, LDB);

    if ((info_solution != 0)|(info != 0))
       printf("-- Error in SGETRS example ! \n");
    else
       printf("-- Run of SGETRS example successful ! \n");

    free(A1); free(A2); free(B1); free(B2); free(IPIV); free(L);

    PLASMA_Finalize();

    return EXIT_SUCCESS;
}

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Variable Documentation

int IONE = 1

Definition at line 29 of file example_sgetrs.c.

int ISEED[4] = {0,0,0,1}

Definition at line 30 of file example_sgetrs.c.