How do I call a subfunction (local function)?

Question

Angel Washington 2020-4-27

1
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https://ww2.mathworks.cn/matlabcentral/answers/520967-how-do-i-call-a-subfunction-local-function

评论： Angel Washington 2020-4-27

I am supposed to make a game of tictactoe using a sunfunction (local function). I keep getting errors on the line that I am trying to call the subfunction (the line that has "???"). Can someone please help me with making the correct code to call my subfunction, "Initialize_Board."

function Ticktacktoe()
    clc();
    
    % The board size must be square, but it can be any size > 1
    Board_size = 3;
    
    ???
    
    % Begin playing the game until someone wins or the board is full
    Whose_turn = 'X';
    Winner     = ' ';
    while Winner == ' '
        
        % Display the current tic-tac-toe board
        disp(Board);
        
        % Get the location to put the next X or O
        fprintf('Enter %c''s row   : ', Whose_turn);
        Row = input('');
        fprintf('Enter %c''s column: ', Whose_turn);
        Column = input('');
        
        % Place the X or O on the Board; the times 2 skips over the borders
        Board(Row*2,Column*2) = Whose_turn;
        
        % Check to see if this created a sequence -- i.e., is there a winner?
        if sum( sum( Board == Whose_turn ) == Board_size) > 0 % a column is full of the same symbols
            Winner = Whose_turn;
        elseif sum( sum( Board' == Whose_turn ) == Board_size) > 0 % a row is full of the same symbols
            Winner = Whose_turn;
        elseif sum( diag(Board,0) == Whose_turn ) == Board_size % the diagonal has all the same symbols
            Winner = Whose_turn;
        else % check the upper-right to lower left diagonal for all of the same symbols
            Total_Xs = 0;
            for row = 2:2:Board_size*2
                if Board(row,(Board_size*2-row+2) ) == Whose_turn
                    Total_Xs = Total_Xs + 1;
                end
            end
            if Total_Xs == Board_size
                Winner = Whose_turn;
            end
        end
        
        % Check to see if all the blanks are gone and the game is over
        if sum( sum( Board == ' ') ) == 0
            Winner = 'C'; % "Cat" got the game
        end
        
        % Switch players turn
        if Whose_turn == 'X'
            Whose_turn = 'O';
        else
            Whose_turn = 'X';
        end
        
    end % while Winner == ' '
    
    % Display the final board layout so we can see the last move
    disp(Board);
    
    % Display who won
    if Winner == 'X'
        fprintf('X won - congratulations!\n');
    elseif Winner == 'O'
        fprintf('O won - congratulations!\n');
    else % it must be a 'cat' game
        fprintf('Cat won - sorry.\n');
    end
    
end % function tictacktoe
function Initialize_Board()
    %   INPUTS: Board_Size
    %   OUTPUTS: Board
    %
    %  REFERENCES: None
    %---------------------------------------------------------------
    
    clc();
    % Allocate a character array for the board description.
    % The board contains the square boundaries and a blank space
    % for the X's and O's to be played into.
    Board = char(2*Board_size + 1, 2*Board_size + 1);
    
    % Initialize the board.
    Row = 1;
    for j = 1:Board_size
        Board(Row,  1) = '+';
        Board(Row+1,1) = '|';
        
        Column = 2;
        for k = 1:Board_size
            Board(Row,Column  ) = '-';
            Board(Row,Column+1) = '+';
            
            Board(Row+1,Column  ) = ' ';
            Board(Row+1,Column+1) = '|';
            
            Column = Column + 2;
        end
        
        Row = Row + 2;
    end
    
    % Fill in the bottom row of the board
    Board(Row,  1) = '+';
    
    Column = 2;
    for k = 1:Board_size
        Board(Row,Column  ) = '-';
        Board(Row,Column+1) = '+';
        
        Column = Column + 2;
    end
end % function Initialize_Board