minimax matlab code in matlab

main.m
function [bestMove, bestScore] = minimax(board, depth, maximizingPlayer)
% MINIMAX finds the best move and score for the current player in a game of Tic Tac Toe.
% Inputs:
%   - board: a 3x3 matrix representing the current board state.
%   - depth: the current depth of the search tree (starting from 0).
%   - maximizingPlayer: a logical value indicating whether the current player is trying to maximize the score.
% Outputs:
%   - bestMove: a 2-element vector representing the row and column indices of the best move.
%   - bestScore: the score of the best move.
    
    % Check if the game is over or if the maximum depth is reached.
    if checkWin(board)
        % A player has won the game, return a score based on the current depth.
        score = getScore(board, depth);
        bestScore = score;
        bestMove = [];
        return
    elseif checkTie(board)
        % The game is a tie, return a score of 0.
        bestScore = 0;
        bestMove = [];
        return
    elseif depth == 0
        % The maximum search depth is reached, return an estimate of the score based on the current board state.
        score = getScore(board, depth);
        bestScore = score;
        bestMove = [];
        return
    end
    
    % Iterate over all possible moves and compute their scores.
    scores = [];
    moves = getMoves(board);
    for i = 1:length(moves)
        move = moves{i};
        newBoard = applyMove(board, move, maximizingPlayer);
        [~, score] = minimax(newBoard, depth - 1, ~maximizingPlayer);
        scores = [scores score];
    end
    
    % Select the best move based on the current player (maximizing or minimizing).
    if maximizingPlayer
        [bestScore, idx] = max(scores);
    else
        [bestScore, idx] = min(scores);
    end
    bestMove = moves{idx};
end

function [score] = getScore(board, depth)
% GETSCORE computes a score based on the current board state and the current depth of the search tree.
% The score is positive if the current player is winning, negative if the opponent is winning, and 0 otherwise.
    if checkWin(board)
        % A player has won the game, return a score based on the current depth.
        score = 10 - depth;
    elseif checkWin(board, 'o')
        % The opponent has won the game, return a negative score based on the current depth.
        score = depth - 10;
    else
        % The game is ongoing, return a neutral score.
        score = 0;
    end
end
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