Help with stem different colors

For my second plot my red lines keep coming up as red rings please help me with this clc; close all;

N=52;

x = zeros(1,N);

for n = 1:length(x)

    x(n)= sin((n/16)*pi);
end

y= zeros(1,N);

y(1)=0;

for n = 2:length(x)-2

    y(n+1)=(-1/3)*x(n+2)+(1/2)*x(n+1)+(1/3)*x(n)+y(n);
end

stem(0:1:51, y, 'r-');

xlabel('n');

ylabel('y[n]');

title('Output y[n] of the system');

pause;

z = conv(x,h);

stem(0:1:51, y, 'r-');

hold

stem(0:1:102, z, 'bo');

xlabel('n');

ylabel('z[n]');

title('z[n]');

legend('z[n]','y[n]');

Answer 1

[Star Strider]

If you just want the vertical lines without the markers:

stem(0:1:51, y, 'r-', 'Marker','none')

If you want the markers solid colours:

stem(0:51, y, 'bo', 'filled')

[Christopher Carey]

Hey this is just making my red plot not display at all I'm just seeing the blue.

[Star Strider]

You need to specify different figures. Using hold is appropriate for the second plot.

figure(1)
stem(0:1:51, y, 'r-');
xlabel('n');
ylabel('y[n]');
title('Output y[n] of the system');

pause;

z = conv(x,h);

figure(2)
stem(0:1:51, y, 'r-');
hold on
stem(0:1:102, z, 'bo')
hold off
xlabel('n');
ylabel('z[n]');
title('z[n]');
legend('z[n]','y[n]')

If you want them all in the same plot, put hold on after the first plot instead, and remove the figure(2) line.

I did not specifically test this part of your code. It should work.