98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include "lapacke.h"
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/* Auxiliary routines prototypes */
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extern void print_matrix( char* desc, lapack_int m, lapack_int n, double* a, lapack_int lda );
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extern void print_int_vector( char* desc, lapack_int n, lapack_int* a );
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/* Parameters */
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#define N 5
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#define NRHS 3
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#define LDA N
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#define LDB NRHS
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/* Main program */
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int main() {
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/* Locals */
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lapack_int n = N, nrhs = NRHS, lda = LDA, ldb = LDB, info;
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/* Local arrays */
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lapack_int ipiv[N];
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double a[LDA*N] = {
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6.80, -6.05, -0.45, 8.32, -9.67,
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-2.11, -3.30, 2.58, 2.71, -5.14,
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5.66, 5.36, -2.70, 4.35, -7.26,
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5.97, -4.44, 0.27, -7.17, 6.08,
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8.23, 1.08, 9.04, 2.14, -6.87
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};
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double b[LDB*N] = {
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4.02, -1.56, 9.81,
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6.19, 4.00, -4.09,
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-8.22, -8.67, -4.57,
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-7.57, 1.75, -8.61,
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-3.03, 2.86, 8.99
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};
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double aNorm;
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double rcond;
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char ONE_NORM = '1';
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lapack_int NROWS = n;
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lapack_int NCOLS = n;
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lapack_int LEADING_DIMENSION_A = n;
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/* Print Entry Matrix */
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print_matrix( "Entry Matrix A", n, n, a, lda );
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/* Print Right Rand Side */
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print_matrix( "Right Rand Side", n, nrhs, b, ldb );
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printf( "\n" );
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/* Executable statements */
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printf( "LAPACKE_dgecon Example Program Results\n" );
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aNorm = LAPACKE_dlange(LAPACK_ROW_MAJOR, ONE_NORM, NROWS, NCOLS, a, LEADING_DIMENSION_A);
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info = LAPACKE_dgetrf(LAPACK_ROW_MAJOR, NROWS, NCOLS, a, LEADING_DIMENSION_A, ipiv);
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info = LAPACKE_dgecon(LAPACK_ROW_MAJOR, ONE_NORM, n, a, LEADING_DIMENSION_A, aNorm, &rcond); // aNorm should be 35.019999999999996
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double work[4*N];
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int iwork[N];
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//info = LAPACKE_dgecon_work(LAPACK_ROW_MAJOR, ONE_NORM, n, a, LEADING_DIMENSION_A, aNorm, &rcond, work, iwork); // aNorm should be 35.019999999999996
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//dgecon_( &ONE_NORM, &n, a, &LEADING_DIMENSION_A, &aNorm, &rcond, work, iwork, &info );
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/* Check for the exact singularity */
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if (info == 0)
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{
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printf("LAPACKE_dgecon completed SUCCESSFULLY...\n");
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}
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else if ( info < 0 )
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{
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printf( "Element %d of A had an illegal value\n", -info );
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exit( 1 );
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}
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else
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{
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printf( "Unrecognized value of INFO = %d\n", info );
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exit( 1 );
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}
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/* Print solution */
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printf("LAPACKE_dlange / One-norm of A = %lf\n", aNorm);
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printf("LAPACKE_dgecon / RCOND of A = %f\n", rcond);
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exit( 0 );
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} /* End of LAPACKE_dgesv Example */
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/* Auxiliary routine: printing a matrix */
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void print_matrix( char* desc, lapack_int m, lapack_int n, double* a, lapack_int lda ) {
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lapack_int i, j;
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printf( "\n %s\n", desc );
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for( i = 0; i < m; i++ ) {
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for( j = 0; j < n; j++ ) printf( " %6.2f", a[i*lda+j] );
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printf( "\n" );
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}
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}
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/* Auxiliary routine: printing a vector of integers */
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void print_int_vector( char* desc, lapack_int n, lapack_int* a ) {
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lapack_int j;
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printf( "\n %s\n", desc );
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for( j = 0; j < n; j++ ) printf( " %6i", a[j] );
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printf( "\n" );
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}
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