/* nag_dorglq (f08ajc) Example Program. * * Copyright 2001 Numerical Algorithms Group. * * Mark 7, 2001. * Mark 7b revised, 2004. */ #include #include #include #include #include int main(int argc, char *argv[]) { FILE *fpin, *fpout; char *outfile = 0; /* Scalars */ Integer i, j, m, n, pda; Integer exit_status = 0; NagError fail; Nag_OrderType order; /* Arrays */ char *title = 0; double *a = 0, *tau = 0; #ifdef NAG_COLUMN_MAJOR #define A(I, J) a[(J - 1) * pda + I - 1] order = Nag_ColMajor; #else #define A(I, J) a[(I - 1) * pda + J - 1] order = Nag_RowMajor; #endif INIT_FAIL(fail); /* Check for command-line IO options */ fpin = nag_example_file_io(argc, argv, "-data", NULL); fpout = nag_example_file_io(argc, argv, "-results", NULL); (void) nag_example_file_io(argc, argv, "-nag_write", &outfile); fprintf(fpout, "nag_dorglq (f08ajc) Example Program Results\n\n"); /* Skip heading in data file */ fscanf(fpin, "%*[^\n] "); fscanf(fpin, "%ld%ld%*[^\n] ", &m, &n); #ifdef NAG_COLUMN_MAJOR pda = m; #else pda = n; #endif /* Allocate memory */ if (!(title = NAG_ALLOC(31, char)) || !(a = NAG_ALLOC(m * n, double)) || !(tau = NAG_ALLOC(m, double))) { fprintf(fpout, "Allocation failure\n"); exit_status = -1; goto END; } /* Read A from data file */ for (i = 1; i <= m; ++i) { for (j = 1; j <= n; ++j) fscanf(fpin, "%lf", &A(i, j)); } fscanf(fpin, "%*[^\n] "); /* Compute the LQ factorization of A */ /* nag_dgelqf (f08ahc). * LQ factorization of real general rectangular matrix */ nag_dgelqf(order, m, n, a, pda, tau, &fail); if (fail.code != NE_NOERROR) { fprintf(fpout, "Error from nag_dgelqf (f08ahc).\n%s\n", fail.message); exit_status = 1; goto END; } /* Form the leading M rows of Q explicitly */ /* nag_dorglq (f08ajc). * Form all or part of orthogonal Q from LQ factorization * determined by nag_dgelqf (f08ahc) */ nag_dorglq(order, m, n, m, a, pda, tau, &fail); if (fail.code != NE_NOERROR) { fprintf(fpout, "Error from nag_dorglq (f08ajc).\n%s\n", fail.message); exit_status = 1; goto END; } /* Print the leading M rows of Q only */ Vsprintf(title, "The leading %2ld rows of Q\n", m); /* nag_gen_real_mat_print (x04cac). * Print real general matrix (easy-to-use) */ if (outfile) fclose(fpout); nag_gen_real_mat_print(order, Nag_GeneralMatrix, Nag_NonUnitDiag, m, n, a, pda, title, outfile, &fail); if (outfile && !(fpout = fopen(outfile, "a"))) { exit_status = 2; goto END; } if (fail.code != NE_NOERROR) { fprintf(fpout, "Error from nag_gen_real_mat_print (x04cac).\n%s\n", fail.message); exit_status = 1; goto END; } END: if (fpin != stdin) fclose(fpin); if (fpout != stdout) fclose(fpout); if (title) NAG_FREE(title); if (a) NAG_FREE(a); if (tau) NAG_FREE(tau); return exit_status; }