70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
/* cblas_example.c */
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#include <stdio.h>
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#include <stdlib.h>
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#include "cblas.h"
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int main ( )
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{
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CBLAS_LAYOUT Layout;
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CBLAS_TRANSPOSE transa;
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double *a, *x, *y;
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double alpha, beta;
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int m, n, lda, incx, incy, i;
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Layout = CblasColMajor;
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transa = CblasNoTrans;
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m = 4; /* Size of Column ( the number of rows ) */
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n = 4; /* Size of Row ( the number of columns ) */
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lda = 4; /* Leading dimension of 5 * 4 matrix is 5 */
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incx = 1;
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incy = 1;
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alpha = 1;
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beta = 0;
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a = (double *)malloc(sizeof(double)*m*n);
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x = (double *)malloc(sizeof(double)*n);
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y = (double *)malloc(sizeof(double)*n);
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/* The elements of the first column */
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a[0] = 1;
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a[1] = 2;
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a[2] = 3;
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a[3] = 4;
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/* The elements of the second column */
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a[m] = 1;
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a[m+1] = 1;
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a[m+2] = 1;
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a[m+3] = 1;
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/* The elements of the third column */
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a[m*2] = 3;
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a[m*2+1] = 4;
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a[m*2+2] = 5;
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a[m*2+3] = 6;
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/* The elements of the fourth column */
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a[m*3] = 5;
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a[m*3+1] = 6;
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a[m*3+2] = 7;
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a[m*3+3] = 8;
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/* The elemetns of x and y */
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x[0] = 1;
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x[1] = 2;
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x[2] = 1;
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x[3] = 1;
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y[0] = 0;
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y[1] = 0;
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y[2] = 0;
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y[3] = 0;
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cblas_dgemv( Layout, transa, m, n, alpha, a, lda, x, incx, beta,
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y, incy );
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/* Print y */
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for( i = 0; i < n; i++ )
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printf(" y%d = %f\n", i, y[i]);
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free(a);
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free(x);
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free(y);
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return 0;
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}
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