50 lines
888 B
C
50 lines
888 B
C
#include <cblas.h>
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#include <stdio.h>
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double m[] = {
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3, 1, 3,
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1, 5, 9,
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2, 6, 5
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};
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double x[] = {
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-1, 3, -3
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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void dgesv_(int *n, int *nrhs, double *a, int *lda,
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int *ipivot, double *b, int *ldb, int *info);
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#ifdef __cplusplus
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}
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#endif
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int main(void) {
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int i;
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// blas:
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double A[6] = {1.0, 2.0, 1.0, -3.0, 4.0, -1.0};
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double B[6] = {1.0, 2.0, 1.0, -3.0, 4.0, -1.0};
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double C[9] = {.5, .5, .5, .5, .5, .5, .5, .5, .5};
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cblas_dgemm(CblasColMajor, CblasNoTrans, CblasTrans,
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3, 3, 2, 1, A, 3, B, 3, 2, C, 3);
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for (i = 0; i < 9; i++)
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printf("%f\n", C[i]);
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// lapack:
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int ipiv[3];
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int j;
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int info;
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int n = 1;
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int nrhs = 1;
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int lda = 3;
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int ldb = 3;
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dgesv_(&n,&nrhs, &m[0], &lda, ipiv, &x[0], &ldb, &info);
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for (i=0; i<3; ++i)
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printf("%5.1f\n", x[i]);
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return 0;
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}
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