{
	      AA (row,col) = 0.0;
	      AA (col,row) = 0.0;
	    }
	}
    }

  x = static_cast<ColumnVector> (xleftdiv (AA, static_cast<Matrix>(AAx + dx * t)));
  x = static_cast<ColumnVector> (xleftdiv (AA, static_cast<Matrix>(static_cast<ColumnVector>(AAx + dx * t))));
  
  for (row = 0; row < Nx; row++)
    {
      if (openx (row) > 0.5)
	{
	  x (row) = 0.0;
	}