example_dgeqrs.c File Reference

Example for solving overdetermined linear systems. 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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Macros
#define	max(a, b)   ((a) > (b) ? (a) : (b))
#define	min(a, b)   ((a) < (b) ? (a) : (b))

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

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

---

Detailed Description

Example for solving overdetermined linear systems.

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 d Tue Nov 22 14:35:53 2011

Definition in file example_dgeqrs.c.

---

Macro Definition Documentation

#define max	(		a,
			b
	)		((a) > (b) ? (a) : (b))

Definition at line 28 of file example_dgeqrs.c.

#define min	(		a,
			b
	)		((a) < (b) ? (a) : (b))

Definition at line 31 of file example_dgeqrs.c.

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Function Documentation

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

int main

(

)

Definition at line 39 of file example_dgeqrs.c.

References check_solution(), IONE, ISEED, PLASMA_Alloc_Workspace_dgeqrf(), PLASMA_dgeqrf(), PLASMA_dgeqrs(), PLASMA_Finalize(), PLASMA_Init(), and T.

{

    int cores = 2;
    int M     = 15;
    int N     = 10;
    int LDA   = 15;
    int NRHS  = 5;
    int LDB   = 15;

    int info;
    int info_solution;
    int i,j;
    int LDAxN = LDA*N;
    int LDBxNRHS = LDB*NRHS;

    double *A1 = (double *)malloc(LDA*N*sizeof(double));
    double *A2 = (double *)malloc(LDA*N*sizeof(double));
    double *B1 = (double *)malloc(LDB*NRHS*sizeof(double));
    double *B2 = (double *)malloc(LDB*NRHS*sizeof(double));
    double *T;

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

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

    /* Allocate T */
    PLASMA_Alloc_Workspace_dgeqrf(M, N, &T);

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

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

    /* Factorization QR of the matrix A2 */
    info = PLASMA_dgeqrf(M, N, A2, LDA, T);

    /* Solve the problem */
    info = PLASMA_dgeqrs(M, N, NRHS, A2, LDA, T, B2, LDB);

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

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

    free(A1); free(A2); free(B1); free(B2); free(T);

    PLASMA_Finalize();

    return EXIT_SUCCESS;
}

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Variable Documentation

int IONE = 1

Definition at line 36 of file example_dgeqrs.c.

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

Definition at line 37 of file example_dgeqrs.c.