/* nag_zhpr (f16sqc) Example Program. * * Copyright 2005 Numerical Algorithms Group. * * Mark 8, 2005. */ #include #include #include #include #include int main(void) { /* Scalars */ double alpha, beta; Integer exit_status, i, incx, j, n, ap_len, xlen; /* Arrays */ Complex *ap=0, *x=0; char nag_enum_arg[40]; /* Nag Types */ NagError fail; Nag_OrderType order; Nag_UploType uplo; #ifdef NAG_COLUMN_MAJOR #define A_UPPER(I,J) ap[J*(J-1)/2 + I - 1] #define A_LOWER(I,J) ap[(2*n-J)*(J-1)/2 + I - 1] order = Nag_ColMajor; #else #define A_LOWER(I,J) ap[I*(I-1)/2 + J - 1] #define A_UPPER(I,J) ap[(2*n-I)*(I-1)/2 + J - 1] order = Nag_RowMajor; #endif exit_status = 0; INIT_FAIL(fail); Vprintf( "nag_zhpr (f16sqc) Example Program Results\n\n"); /* Skip heading in data file */ Vscanf("%*[^\n] "); /* Read the problem dimension */ Vscanf("%ld%*[^\n] ", &n); /* Read the uplo storage parameter */ Vscanf("%s%*[^\n] ", nag_enum_arg); /* nag_enum_name_to_value(x04nac). * Converts NAG enum member name to value */ uplo = nag_enum_name_to_value(nag_enum_arg); /* Read scalar parameters */ Vscanf("%lf%lf%*[^\n] ", &alpha, &beta); /* Read increment parameter */ Vscanf("%ld%*[^\n] ", &incx); xlen = MAX(1, 1 + (n - 1)*ABS(incx)); ap_len = n * (n + 1)/2; if (n > 0) { /* Allocate memory */ if ( !(ap = NAG_ALLOC(ap_len, Complex)) || !(x = NAG_ALLOC(xlen, Complex))) { Vprintf("Allocation failure\n"); exit_status = -1; goto END; } } else { Vprintf("Invalid n\n"); exit_status = 1; return exit_status; } /* Input matrix A and vector x */ if (uplo == Nag_Upper) { for (i = 1; i <= n; ++i) { for (j = i; j <= n; ++j) Vscanf(" ( %lf , %lf )", &A_UPPER(i,j).re, &A_UPPER(i,j).im); Vscanf("%*[^\n] "); } } else { for (i = 1; i <= n; ++i) { for (j = 1; j <= i; ++j) Vscanf(" ( %lf , %lf )", &A_LOWER(i,j).re, &A_LOWER(i,j).im); Vscanf("%*[^\n] "); } } for (i = 0; i < xlen; ++i) Vscanf(" ( %lf , %lf )%*[^\n] ", &x[i].re, &x[i].im); /* nag_zhpr(f16sqc). * Rank one update of complex Hermitian matrix, * packed storage. */ nag_zhpr(order, uplo, n, alpha, x, incx, beta, ap, &fail); if (fail.code != NE_NOERROR) { Vprintf("Error from nag_zhpr.\n%s\n", fail.message); exit_status = 1; goto END; } /* Print updated matrix A */ /* nag_pack_complx_mat_print_comp (x04ddc). * Print complex packed triangular matrix (comprehensive) */ nag_pack_complx_mat_print_comp(order, uplo, Nag_NonUnitDiag, n, ap, Nag_BracketForm, "%7.4f", "Updated Matrix A", Nag_IntegerLabels, 0, Nag_IntegerLabels, 0, 80, 0, 0, &fail); if (fail.code != NE_NOERROR) { Vprintf("Error from nag_pack_complx_mat_print_comp (x04ddc).\n%s" "\n", fail.message); exit_status = 1; goto END; } END: if (ap) NAG_FREE(ap); if (x) NAG_FREE(x); return exit_status; }