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Diffstat (limited to 'hwpfilter/source/solver.cpp')
| -rw-r--r-- | hwpfilter/source/solver.cpp | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/hwpfilter/source/solver.cpp b/hwpfilter/source/solver.cpp new file mode 100644 index 000000000000..e21d9b310deb --- /dev/null +++ b/hwpfilter/source/solver.cpp @@ -0,0 +1,183 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +#include <math.h> +#include "solver.h" + +//--------------------------------------------------------------------------- +double** mgcLinearSystemD::NewMatrix (int N) +{ + double** A = new double*[N]; + if ( !A ) + return 0; + + for (int row = 0; row < N; row++) + { + A[row] = new double[N]; + if ( !A[row] ) + { + for (int i = 0; i < row; i++) + delete[] A[i]; + return 0; + } + for (int col = 0; col < N; col++) + A[row][col] = 0; + } + return A; +} +//--------------------------------------------------------------------------- +void mgcLinearSystemD::DeleteMatrix (int N, double** A) +{ + for (int row = 0; row < N; row++) + delete[] A[row]; + delete[] A; +} +//--------------------------------------------------------------------------- +double* mgcLinearSystemD::NewVector (int N) +{ + double* B = new double[N]; + if ( !B ) + return 0; + + for (int row = 0; row < N; row++) + B[row] = 0; + return B; +} +//--------------------------------------------------------------------------- +int mgcLinearSystemD::Solve (int n, double** a, double* b) +{ + int* indxc = new int[n]; + if ( !indxc ) + return 0; + int* indxr = new int[n]; + if ( !indxr ) { + delete[] indxc; + return 0; + } + int* ipiv = new int[n]; + if ( !ipiv ) { + delete[] indxc; + delete[] indxr; + return 0; + } + + int i, j, k; + int irow = 0; + int icol = 0; + double big, pivinv, save; + + for (j = 0; j < n; j++) + ipiv[j] = 0; + + for (i = 0; i < n; i++) + { + big = 0; + for (j = 0; j < n; j++) + { + if ( ipiv[j] != 1 ) + { + for (k = 0; k < n; k++) + { + if ( ipiv[k] == 0 ) + { + if ( fabs(a[j][k]) >= big ) + { + big = fabs(a[j][k]); + irow = j; + icol = k; + } + } + else if ( ipiv[k] > 1 ) + { + delete[] ipiv; + delete[] indxr; + delete[] indxc; + return 0; + } + } + } + } + ipiv[icol]++; + + if ( irow != icol ) + { + double* rowptr = a[irow]; + a[irow] = a[icol]; + a[icol] = rowptr; + + save = b[irow]; + b[irow] = b[icol]; + b[icol] = save; + } + + indxr[i] = irow; + indxc[i] = icol; + if ( a[icol][icol] == 0 ) + { + delete[] ipiv; + delete[] indxr; + delete[] indxc; + return 0; + } + + pivinv = 1/a[icol][icol]; + a[icol][icol] = 1; + for (k = 0; k < n; k++) + a[icol][k] *= pivinv; + b[icol] *= pivinv; + + for (j = 0; j < n; j++) + { + if ( j != icol ) + { + save = a[j][icol]; + a[j][icol] = 0; + for (k = 0; k < n; k++) + a[j][k] -= a[icol][k]*save; + b[j] -= b[icol]*save; + } + } + } + + for (j = n-1; j >= 0; j--) + { + if ( indxr[j] != indxc[j] ) + { + for (k = 0; k < n; k++) + { + save = a[k][indxr[j]]; + a[k][indxr[j]] = a[k][indxc[j]]; + a[k][indxc[j]] = save; + } + } + } + + delete[] ipiv; + delete[] indxr; + delete[] indxc; + return 1; +} |