Mvmult_n_unb_var2.m

% Copyright 2023 The University of Texas at Austin
%
% For licensing information see
%                http://www.cs.utexas.edu/users/flame/license.html 
%                                                                                 
% Programmed by: Anni Liu

% Interpret the function: http://edx-org-utaustinx.s3.amazonaws.com/UT501x/PictureFLAME/PictureFLAME.html

function [ y_out ] = Mvmult_n_unb_var2( A, x, y )

  [ AL, AR ] = FLA_Part_1x2( A, ...
                               0, 'FLA_LEFT' );

  [ xT, ...
    xB ] = FLA_Part_2x1( x, ...
                         0, 'FLA_TOP' );

  while ( size( AL, 2 ) < size( A, 2 ) )

    [ A0, a1, A2 ]= FLA_Repart_1x2_to_1x3( AL, AR, ...
                                         1, 'FLA_RIGHT' );

    [ x0, ...
      chi1, ...
      x2 ] = FLA_Repart_2x1_to_3x1( xT, ...
                                    xB, ...
                                    1, 'FLA_BOTTOM' );

    %------------------------------------------------------------%

    y = laff_scal(chi1, a1) + y;

    %------------------------------------------------------------%

    [ AL, AR ] = FLA_Cont_with_1x3_to_1x2( A0, a1, A2, ...
                                           'FLA_LEFT' );

    [ xT, ...
      xB ] = FLA_Cont_with_3x1_to_2x1( x0, ...
                                       chi1, ...
                                       x2, ...
                                       'FLA_TOP' );

  end

  y_out = y;


return

% Test the function:
% A = randi([-2,2], 4, 3)
% x = [1 
% 2 
% 3] or x = [1 2 3]
% y = [0 
% 0 
% 0 
% 0]
% Mvmult_n_unb_var2( A, x, y )