/* nag_zsymv (f16tac) Example Program. * * Copyright 2005 Numerical Algorithms Group. * * Mark 8, 2005. */ #include #include #include #include int main(void) { /* Scalars */ Complex alpha, beta; Integer exit_status, i, incx, incy, j, n, pda, xlen, ylen; /* Arrays */ Complex *a = 0, *x = 0, *y = 0; char nag_enum_arg[40]; /* Nag Types */ NagError fail; Nag_OrderType order; Nag_UploType uplo; #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 exit_status = 0; INIT_FAIL(fail); printf("nag_zsymv (f16tac) Example Program Results\n\n"); /* Skip heading in data file */ scanf("%*[^\n] "); /* Read the problem dimension */ scanf("%ld%*[^\n] ", &n); /* Read uplo */ scanf("%39s%*[^\n] ", nag_enum_arg); /* nag_enum_name_to_value (x04nac). * Converts NAG enum member name to value */ uplo = (Nag_UploType) nag_enum_name_to_value(nag_enum_arg); /* Read scalar parameters */ scanf(" ( %lf , %lf ) ( %lf , %lf )%*[^\n] ", &alpha.re, &alpha.im, &beta.re, &beta.im); /* Read increment parameters */ scanf("%ld%ld%*[^\n] ", &incx, &incy); pda = n; xlen = MAX(1, 1 + (n - 1)*ABS(incx)); ylen = MAX(1, 1 + (n - 1)*ABS(incy)); if (n > 0) { /* Allocate memory */ if (!(a = NAG_ALLOC(n*pda, Complex)) || !(x = NAG_ALLOC(xlen, Complex)) || !(y = NAG_ALLOC(ylen, Complex))) { printf("Allocation failure\n"); exit_status = -1; goto END; } } else { printf("Invalid n\n"); exit_status = 1; return exit_status; } /* Input the matrix A and vectors x and y */ if (uplo == Nag_Upper) { for (i = 1; i <= n; ++i) { for (j = i; j <= n; ++j) scanf(" ( %lf , %lf ) ", &A(i, j).re, &A(i, j).im); } scanf("%*[^\n] "); } else { for (i = 1; i <= n; ++i) { for (j = 1; j <= i; ++j) scanf(" ( %lf , %lf ) ", &A(i, j).re, &A(i, j).im); } scanf("%*[^\n] "); } for (i = 1; i <= xlen; ++i) scanf(" ( %lf , %lf )%*[^\n] ", &x[i - 1].re, &x[i - 1].im); for (i = 1; i <= ylen; ++i) scanf(" ( %lf , %lf )%*[^\n] ", &y[i - 1].re, &y[i - 1].im); /* nag_zsymv (f16tac). * Complex symmetric matrix-vector multiply. * */ nag_zsymv(order, uplo, n, alpha, a, pda, x, incx, beta, y, incy, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_zsymv.\n%s\n", fail.message); exit_status = 1; goto END; } /* Print output vector y */ printf("%s\n", " y"); for (i = 1; i <= ylen; ++i) printf("(%11f,%11f)\n", y[i-1].re, y[i-1].im); END: NAG_FREE(a); NAG_FREE(x); NAG_FREE(y); return exit_status; }