[MATLAB] A fitness function for a 4x4 sudoku using genetic algorithm

sudoku.m

function score = sudoku(x)
    x = reshape(round(x), 4, 4);
    
    x(1,1) = 1;
    x(1,4) = 2;
    x(2,3) = 1;
    x(3,2) = 3;
    x(4,1) = 4;
    x(4,4) = 3;
    
    score = length(x(x < 1)) + length(x(x > 4));
    
    for i = 1:4
        score = score + 8 - length(unique(x(i, :))) - length(unique(x(:, i)));
    end
    
    if ~score
        clc
        x
    end
end