MATLAB: How to graph game scores over time

graphingif statementrock paper scissorsscores

How can I graph scores over time when the scores are determined in an if-else function? (Plot the score on the y axis and the round # on the x axis)
I have to code a rock-paper-scissors game where it is a computer playing itself, using the random function (randi). Every time I try to plot it, nothing shows up. The following graph is what it should look like (just an example).
This is my code that I have set up at the moment:
scoreA=0; %score for playerA
scoreB=0; %score for playerB
score={1,2,3}
i=0
for i=(0:9999)
    playerA=score{randi(length(score))}
    playerB=score{randi(length(score))}
    if ((playerA==2)&&(playerB==2))   %tie 2=2
        disp('No points.')
        scoreA=scoreA-0 
        scoreB=scoreB-0
        i=i+1
    elseif ((playerA==2)&&(playerB==1)) %2>1
        disp('+1 point to playerA!')
        scoreA=scoreA+1
        i=i+1
    elseif ((playerA==3)&&(playerB==2)) %3>2
        disp('+1 point to playerA!')
        scoreA=scoreA+1
        i=i+1
    elseif ((playerA==1)&&(playerB==3)) %1>3
        disp('+1 point to playerA!')
        scoreA=scoreA+1
        i=i+1
    elseif ((playerA==1)&&(playerB==2)) %1<2
        disp('+1 point to playerB!')
        scoreB=scoreB+1
        i=i+1
    elseif ((playerA==3)&&(playerB==1)) %3<1 
        disp('+1 point to playerB!')
        scoreB=scoreB+1
        i=i+1
    elseif ((playerA==2)&&(playerB==3)) %2<3
        disp('+1 point to playerB!')
        scoreB=scoreB+1
        i=i+1
    elseif ((playerA==1)&&(playerB==1))   %tie 1=1
        disp('No points.')
        scoreA=scoreA-0
        scoreB=scoreB-0
        i=i+1
    elseif ((playerA==3)&&(playerB==3))   %tie 3=3
        disp('No points.')
        scoreA=scoreA-0 
        scoreB=scoreB-0
        i=i+1
end
end
% End Game Results
    disp('END GAME SCORES')
    disp('Score for playerA:')
    disp(scoreA)
    disp('Score for playerB:')
    disp(scoreB)
if (scoreA > scoreB)
    disp('playerA won the game!')
elseif (scoreA < scoreB)
    disp('playerB won the game!')
elseif (scoreA == scoreB)
    disp('Game ends in a tie!')
end
%% Score over time figure
% Plot the score on the y axis and the round # on the x axis
plot(-,-);
grid on;
title('Score over Time');
ylabel('Score');
xlabel('Round Number');

Best Answer

You need to save the result into a vector and plot at the end. This is included in the below code. 
scoreA=0; %score for playerA
scoreB=0; %score for playerB
score={1,2,3}
i=0
R = zeros([],1) ;
for i=(0:9999)
    playerA=score{randi(length(score))}
    playerB=score{randi(length(score))}
    if ((playerA==2)&&(playerB==2))   %tie 2=2
        disp('No points.')
        scoreA=scoreA-0 
        scoreB=scoreB-0
        i=i+1
    elseif ((playerA==2)&&(playerB==1)) %2>1
        disp('+1 point to playerA!')
        scoreA=scoreA+1
        i=i+1
    elseif ((playerA==3)&&(playerB==2)) %3>2
        disp('+1 point to playerA!')
        scoreA=scoreA+1
        i=i+1
    elseif ((playerA==1)&&(playerB==3)) %1>3
        disp('+1 point to playerA!')
        scoreA=scoreA+1
        i=i+1
    elseif ((playerA==1)&&(playerB==2)) %1<2
        disp('+1 point to playerB!')
        scoreB=scoreB+1
        i=i+1
    elseif ((playerA==3)&&(playerB==1)) %3<1 
        disp('+1 point to playerB!')
        scoreB=scoreB+1
        i=i+1
    elseif ((playerA==2)&&(playerB==3)) %2<3
        disp('+1 point to playerB!')
        scoreB=scoreB+1
        i=i+1
    elseif ((playerA==1)&&(playerB==1))   %tie 1=1
        disp('No points.')
        scoreA=scoreA-0
        scoreB=scoreB-0
        i=i+1
    elseif ((playerA==3)&&(playerB==3))   %tie 3=3
        disp('No points.')
        scoreA=scoreA-0 
        scoreB=scoreB-0
        i=i+1
    end
    R(i)= scoreA-scoreB ; 
end
% End Game Results
    disp('END GAME SCORES')
    disp('Score for playerA:')
    disp(scoreA)
    disp('Score for playerB:')
    disp(scoreB)
if (scoreA > scoreB)
    disp('playerA won the game!')
elseif (scoreA < scoreB)
    disp('playerB won the game!')
elseif (scoreA == scoreB)
    disp('Game ends in a tie!')
end
%% Score over time figure
% Plot the score on the y axis and the round # on the x axis
plot(R,'b');
grid on;
title('Score over Time');
ylabel('Score');
xlabel('Round Number');
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