DenseLinAlgPack_delete_row_col.cpp

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#include <assert.h>

#include "DenseLinAlgPack_delete_row_col.hpp"
#include "DenseLinAlgPack_DMatrixClass.hpp"
#include "DenseLinAlgPack_DMatrixAsTriSym.hpp"

void DenseLinAlgPack::delete_row_col( size_type kd, DMatrixSliceTriEle* tri_M )
{
  // Validate input
  TEUCHOS_TEST_FOR_EXCEPT( !(  tri_M  ) );
  TEUCHOS_TEST_FOR_EXCEPT( !(  tri_M->rows()  ) );
  TEUCHOS_TEST_FOR_EXCEPT( !(  1 <= kd && kd <= tri_M->rows()  ) );

  DMatrixSlice   M = tri_M->gms();
  const size_type  n = M.rows();

  if( tri_M->uplo() == BLAS_Cpp::lower ) {
    // Move M31 up one row at a time
    if( 1 < kd && kd < n ) {
      Range1D rng(1,kd-1);
      for( size_type i = kd; i < n; ++i )
        M.row(i)(rng) = M.row(i+1)(rng);
    }
    // Move M33 up and to the left one column at a time
    if( kd < n ) {
      for( size_type i = kd; i < n; ++i )
        M.col(i)(i,n-1) = M.col(i+1)(i+1,n);
    }
  }
  else if(  tri_M->uplo() == BLAS_Cpp::upper ) {
    // Move M13 left one column at a time.
    if( 1 < kd && kd < n ) {
      Range1D rng(1,kd-1);
      for( size_type j = kd; j < n; ++j )
        M.col(j)(rng) = M.col(j+1)(rng);
    }
    // Move the updated U33 up and left one column at a time.
    if( kd < n ) {
      for( size_type j = kd; j < n; ++j )
        M.col(j)(kd,j) = M.col(j+1)(kd+1,j+1);
    }
  }
  else {
    TEUCHOS_TEST_FOR_EXCEPT(true); // Invalid input
  }
}