Plotting multiple numbers in 1 graph

I am trying to plot all the values of N for on one graph and it is giving me an error it works for either N = 5, N=9, N=20 by themselves but not all together. As well as i want to change their line weight and their colors and the points to be all different.

N = 5 will be RED and * points

N = 9 will be BLUE and Triangle points

N = 20 will be Green and Circle points

w = .5;             %% 2w=1
x = -.5:0.1:.5;     %% X (-w,w)
N = [5, 9, 20];     %% N [5,9,20]
delta = 2*w./N;

% Matrix for W
Mat_w = zeros(N,1);
for i = 1:N
    Mat_w(i) =(-w+delta.*(i-.5));
end

% U Matrix
u = ones(N,1).*(x.^2);

% F Matrix
f = ones(N,1);

% S Matrix
s = ones(N,N);

for m = 1:N
    for n = 1:N
        s(m,n) = delta/(2*pi)*(1-log(delta)-1/2*log(abs((m-n).^2-.25))...
        -(m-n)*log(abs(m-n+.5)/abs(m-n-.5)));
    end
end

u = s\f;

title('Case 2')
hold on
plot(Mat_w, u)
xlim([-w,w])
legend('N=5', 'N=9', 'N=20');

This is the error in the Command line

Error using zeros

Size inputs must be scalar.

Error in HW9_new (line 7)

Mat_w = zeros(N,1);

[Stephen23]

Original question by WARRIOR24 retrieved from Bing Cache:

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Plotting multiple numbers in 1 graph

I am trying to plot all the values of N for on one graph and it is giving me an error it works for either N = 5, N=9, N=20 by themselves but not all together. As well as i want to change their line weight and their colors and the points to be all different.

N = 5 will be RED and * points

N = 9 will be BLUE and Triangle points

N = 20 will be Green and Circle points

w = .5;             %% 2w=1
x = -.5:0.1:.5;     %% X (-w,w)
N = [5, 9, 20];     %% N [5,9,20]
delta = 2*w./N;
% Matrix for W
Mat_w = zeros(N,1);
for i = 1:N
    Mat_w(i) =(-w+delta.*(i-.5));
end
% U Matrix
u = ones(N,1).*(x.^2);
% F Matrix
f = ones(N,1);
% S Matrix
s = ones(N,N);
for m = 1:N
    for n = 1:N
        s(m,n) = delta/(2*pi)*(1-log(delta)-1/2*log(abs((m-n).^2-.25))...
        -(m-n)*log(abs(m-n+.5)/abs(m-n-.5)));
    end
end
u = s\f;
title('Case 2')
hold on
plot(Mat_w, u)
xlim([-w,w])
legend('N=5', 'N=9', 'N=20');

This is the error in the Command line

Error using zeros
Size inputs must be scalar.
Error in HW9_new (line 7)
Mat_w = zeros(N,1);

[Rena Berman]

(Answers Dev) Restored edit