/* nag_daxpby (f16ecc) Example Program. * * Copyright 2013 Numerical Algorithms Group. * * Mark 24, 2013. */ #include #include #include #include int main(void) { /* Scalars */ Integer exit_status, i, incx, incy, n, xlen, ylen; double alpha, beta; /* Arrays */ double *x = 0, *y = 0; /* Nag Types */ NagError fail; exit_status = 0; INIT_FAIL(fail); printf("nag_daxpby (f16ecc) Example Program Results\n\n"); /* Skip heading in data file */ scanf("%*[^\n] "); /* Read number of elements */ scanf("%ld%*[^\n] ", &n); /* Read increments */ scanf("%ld%ld%*[^\n] ", &incx, &incy); /* Read factors alpha and beta */ scanf("%lf%lf%*[^\n] ", &alpha, &beta); xlen = MAX(1, 1 + (n - 1)*ABS(incx)); ylen = MAX(1, 1 + (n - 1)*ABS(incy)); if (n > 0) { /* Allocate memory */ if (!(x = NAG_ALLOC(xlen, double)) || !(y = NAG_ALLOC(ylen, double))) { printf("Allocation failure\n"); exit_status = -1; goto END; } } else { printf("Invalid n\n"); exit_status = 1; goto END; } /* Input vector x */ for (i = 0; i < xlen ; i = i + abs(incx)) scanf("%lf", &x[i]); scanf("%*[^\n] "); /* Input vector y */ for (i = 0; i < ylen; i = i + abs(incy)) scanf("%lf", &y[i]); scanf("%*[^\n] "); /* nag_daxpby (f16ecc). * Performs y := alpha*x + beta*y */ nag_daxpby(n, alpha, x, incx, beta, y, incy, &fail); if (fail.code != NE_NOERROR) { printf("Error from nag_daxpby (f16ecc).\n%s\n", fail.message); exit_status = 1; goto END; } /* Print the result */ printf("Result of the scaled vector accumulation is\n"); printf("y = ("); for (i = 0; i < ylen - 1; i = i + abs(incy)) printf("%9.4f, ", y[i]); printf("%9.4f)\n", y[ylen - 1]); END: NAG_FREE(x); NAG_FREE(y); return exit_status; }