How do I save changes to a matrix in a while loop?

I have a score board for a rock paper scissors game. I have to give an output of a 1, 0 or -1 based on whether it was win, tie, or loss and based on that update the score board accordingly. Ive done that but im not sure how to keep the scoreboard data between new runs.

Here's the code

clc;clear all
% Setup
playAgain=1;
while playAgain
    disp ('Welcome to Rock, Paper, Scissors: Input 1 for Rock, 2 for Paper, and 3 for Scissors')
    x=input('What would you like to play? ');
    % Player and Computer Choices
    while x < 1 == 1
        if x < 1
            disp('Not A Valid Input, Please Choose Again');
            x=input('What would you like to play? ');
        end
    end
    while x > 3 == 1
        if x > 3
            disp('Not A Valid Input, Please Choose Again');
            x=input('What would you like to play? ');
        end
    end
    y=randi([1 3],1,1);
    options={'Rock' 'Paper' 'Scissors'};
    fprintf('You Chose %s\n',options{x}) 
    options={'Rock' 'Paper' 'Scissors'};
    fprintf('The Computer Chose %s\n',options{y}) 
    [score,attempts] = determinewinner(x,y);
    fprintf('Number of Attempts: %d\n',attempts)
    fprintf('Player Wins: %d\n Ties: %d\n Computer Wins: %d\n', score)
    playAgain=askToPlayAgain();
end
% Functions
function [score,attempts] = determinewinner(x,y)
attempts=0;
win=false;
while ~win
    attempts=attempts+1;
    if [x;y]==[1;3]
        disp("You Win!")
        win = true;
        z=1;
    elseif [x;y]==[1;2]
        disp("You Lose!")
        win = true;
        z=-1;
    elseif [x;y]==[1;1]
        disp("It's A Tie!")
        win = true;
        z=0;
    end
    
    if [x;y]==[2;1]
        disp("You Win!")
        win = true;
        z=1;
    elseif [x;y]==[2;3]
        disp("You Lose!")
        win = true;
        z=-1;
    elseif [x;y]==[2;2]
        disp("It's A Tie!")
        win = true;
        z=0;
    end
    if [x;y]==[3;2]
        z=1;
        disp("You Win!")
        win = true;
    elseif [x;y]==[3;1]
        disp("You Lose!")
        z=-1;
        win = true;
    elseif [x;y]==[3;3]
        disp("It's A Tie!")
        z=0;
        win = true;
    end
end
basescore=[0 0 0];
if z==1
    score=basescore+[1 0 0];
elseif z==0
    score=basescore+[0 1 0];
elseif z==-1
    score=basescore+[0 0 1];
end 
end
function playAgain=askToPlayAgain()
response=input("Play Again? (Y/N): ","s");
playAgain=isequal(response, "Y");
end

Answer 1

[Walter Roberson]

overall_score = [0 0 0];

before the while loop.

overall_score = overall_score + score;
fprintf('Overall Player Wins: %d\n Ties: %d\n Computer Wins: %d\n', overall_score)

before asking to play again.

[David]

This worked perfectly, thank you!

Answer 2

[Subhajyoti]

Hi @David,

In the given code snippet, variable 'attempts' is re-initialised to '0' every time the function is called. Also, variable 'win' is always set to 'true'. Hence, the loop 'while ~win {}' is running only once and the scoreboard is not updating correctly.

You can it as a global variable, and update from the function everytime.

function [score,attempts] = determinewinner(x,y)
global attempts
...
end

Refer to the following MathWorks Documentation to know about 'global' valiables in MATLAB:

https://www.mathworks.com/help/matlab/ref/global.html