/* nag_matop_real_gen_matrix_log (f01ejc) Example Program. * * Copyright 2011, Numerical Algorithms Group. * * Mark 23, 2011. */ #include #include #include #include #include int main(void) { /* Scalars */ Integer exit_status = 0; Integer i, j, n, pda; double imnorm; /* Arrays */ double *a = 0; /* Nag Types */ Nag_OrderType order; NagError fail; INIT_FAIL(fail); #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 /* Output preamble */ printf("nag_matop_real_gen_matrix_log (f01ejc) "); printf("Example Program Results\n\n"); fflush(stdout); /* Skip heading in data file */ scanf("%*[^\n]"); /* Read in the problem size */ scanf("%ld%*[^\n]", &n); pda = n; if (!(a = NAG_ALLOC(pda*n, double))) { printf("Allocation failure\n"); exit_status = -1; goto END; } /* Read in the matrix a from data file */ for (i = 1; i <= n; i++) for (j = 1; j <= n; j++) scanf("%lf", &A(i, j)); scanf("%*[^\n]"); /* Find log(A) using * nag_matop_real_gen_matrix_log (f01ejc) * Real matrix logarithm */ nag_matop_real_gen_matrix_log(order, n, a, pda, &imnorm, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_matop_real_gen_matrix_log (f01ejc)\n%s\n", fail.message); exit_status = 1; goto END; } /* Print solution using * nag_gen_real_mat_print (x04cac) * Print real general matrix (easy-to-use) */ nag_gen_real_mat_print(order, Nag_GeneralMatrix, Nag_NonUnitDiag, n, n, a, pda, "log(A)", NULL, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_gen_real_mat_print (x04cac)\n%s\n", fail.message); exit_status = 2; goto END; } END: NAG_FREE(a); return exit_status; }