/* nag_zgbmv (f16sbc) Example Program. * * Copyright 2005 Numerical Algorithms Group. * * Mark 8, 2005. */ #include #include #include #include #include int main(void) { /* Scalars */ Complex alpha, beta; Integer ab_size, exit_status, i, incx, incy, j, kl, ku; Integer m, n, pdab, xlen, ylen; /* Arrays */ Complex *ab=0, *x=0, *y=0; char nag_enum_arg[40]; /* Nag Types */ NagError fail; Nag_OrderType order; Nag_TransType trans; #ifdef NAG_COLUMN_MAJOR #define AB(I,J) ab[(J-1)*pdab + ku + I - J] order = Nag_ColMajor; #else #define AB(I,J) ab[(I-1)*pdab + kl + J - I] order = Nag_RowMajor; #endif exit_status = 0; INIT_FAIL(fail); Vprintf( "nag_zgbmv (f16sbc) Example Program Results\n\n"); /* Skip heading in data file */ Vscanf("%*[^\n] "); /* Read the problem dimensions */ Vscanf("%ld%ld%ld%ld%*[^\n] ", &m, &n, &kl, &ku); /* Read the transpose parameter */ Vscanf("%s%*[^\n] ", nag_enum_arg); /* nag_enum_name_to_value(x04nac). * Converts NAG enum member name to value */ trans = nag_enum_name_to_value(nag_enum_arg); /* Read scalar parameters */ Vscanf(" ( %lf , %lf ) ( %lf , %lf )%*[^\n] ", &alpha.re, &alpha.im, &beta.re, &beta.im); /* Read increment parameters */ Vscanf("%ld%ld%*[^\n] ", &incx, &incy); pdab = kl + ku + 1; #ifdef NAG_COLUMN_MAJOR ab_size = pdab*n; #else ab_size = pdab*m; #endif if (trans == Nag_NoTrans) { xlen = MAX(1, 1 + (n - 1)*ABS(incx)); ylen = MAX(1, 1 + (m - 1)*ABS(incy)); } else { xlen = MAX(1, 1 + (m - 1)*ABS(incx)); ylen = MAX(1, 1 + (n - 1)*ABS(incy)); } if (m > 0 && n > 0) { /* Allocate memory */ if ( !(ab = NAG_ALLOC(ab_size, Complex)) || !(x = NAG_ALLOC(xlen, Complex))|| !(y = NAG_ALLOC(ylen, Complex))) { Vprintf("Allocation failure\n"); exit_status = -1; goto END; } } else { Vprintf("Invalid m or n\n"); exit_status = 1; return exit_status; } /* Input matrix A and vectors x and y */ for (i = 1; i <= m; ++i) { for (j = MAX(1,i-kl); j <= MIN(n,i+ku); ++j) Vscanf(" ( %lf , %lf )", &AB(i,j).re, &AB(i,j).im); Vscanf("%*[^\n] "); } for (i = 1; i <= xlen; ++i) Vscanf(" ( %lf , %lf )%*[^\n] ", &x[i - 1].re, &x[i - 1].im); for (i = 1; i <= ylen; ++i) Vscanf(" ( %lf , %lf )%*[^\n] ", &y[i - 1].re, &y[i - 1].im); /* nag_zgbmv(f16sbc). * Complex valued band matrix-vector multiply. * */ nag_zgbmv(order, trans, m, n, kl, ku, alpha, ab, pdab, x, incx, beta, y, incy, &fail); if (fail.code != NE_NOERROR) { Vprintf("Error from nag_zgbmv.\n%s\n", fail.message); exit_status = 1; goto END; } /* Print output vector y */ Vprintf("%s\n", " y"); for (i = 1; i <= ylen; ++i) { Vprintf("(%11f,%11f)\n", y[i-1].re, y[i-1].im); } END: if (ab) NAG_FREE(ab); if (x) NAG_FREE(x); if (y) NAG_FREE(y); return exit_status; }