DenseLinAlgPack_delete_row_col.cpp

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00002 // ***********************************************************************
00003 // 
00004 // Moocho: Multi-functional Object-Oriented arCHitecture for Optimization
00005 //                  Copyright (2003) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
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00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
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00023 // USA
00024 // Questions? Contact Roscoe A. Bartlett (rabartl@sandia.gov) 
00025 // 
00026 // ***********************************************************************
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00028 
00029 #include <assert.h>
00030 
00031 #include "DenseLinAlgPack_delete_row_col.hpp"
00032 #include "DenseLinAlgPack_DMatrixClass.hpp"
00033 #include "DenseLinAlgPack_DMatrixAsTriSym.hpp"
00034 
00035 void DenseLinAlgPack::delete_row_col( size_type kd, DMatrixSliceTriEle* tri_M )
00036 {
00037   // Validate input
00038   TEST_FOR_EXCEPT( !(  tri_M  ) );
00039   TEST_FOR_EXCEPT( !(  tri_M->rows()  ) );
00040   TEST_FOR_EXCEPT( !(  1 <= kd && kd <= tri_M->rows()  ) );
00041 
00042   DMatrixSlice   M = tri_M->gms();
00043   const size_type  n = M.rows();
00044 
00045   if( tri_M->uplo() == BLAS_Cpp::lower ) {
00046     // Move M31 up one row at a time
00047     if( 1 < kd && kd < n ) {
00048       Range1D rng(1,kd-1);
00049       for( size_type i = kd; i < n; ++i )
00050         M.row(i)(rng) = M.row(i+1)(rng);
00051     }
00052     // Move M33 up and to the left one column at a time
00053     if( kd < n ) {
00054       for( size_type i = kd; i < n; ++i )
00055         M.col(i)(i,n-1) = M.col(i+1)(i+1,n);
00056     }
00057   }
00058   else if(  tri_M->uplo() == BLAS_Cpp::upper ) {
00059     // Move M13 left one column at a time.
00060     if( 1 < kd && kd < n ) {
00061       Range1D rng(1,kd-1);
00062       for( size_type j = kd; j < n; ++j )
00063         M.col(j)(rng) = M.col(j+1)(rng);
00064     }
00065     // Move the updated U33 up and left one column at a time.
00066     if( kd < n ) {
00067       for( size_type j = kd; j < n; ++j )
00068         M.col(j)(kd,j) = M.col(j+1)(kd+1,j+1);
00069     }
00070   }
00071   else {
00072     TEST_FOR_EXCEPT(true); // Invalid input
00073   }
00074 }

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