How to plot a graph with a for loop

I have a question where I'm required to create a for loop and then use it to plot a graph. I have n = 0,1,2 ... 10 and need to plot cos(n*pi*x/2) for this. My current code looks like this as I'm trying to store the outputs of the for loop in an array

syms x n b a

nvalues = zeros(1, 10);

for n = 1:11

S = cos((n-1)*pi*x*(1/2));

nvalues(n) = S;

end

nvalues

[Mathieu NOE]

hello

simply add to your code - last line :

figure, plot(1:max(n),nvalues)

Answer 1

[Image Analyst]

You need to define x with linspace() and then use hold on in the loop:

x = linspace(0, pi/4, 500);
for n = 0 : 10
	S = cos(n*pi*x / 2);
	%nvalues(n) = S;
	plot(x, S, 'LineWidth', 2);
	hold on;
end
grid on;
xlabel('x', 'FontSize', 16);
ylabel('S', 'FontSize', 16);
title('11 curves', 'FontSize', 16);

[Yuvraj Bhagotra]

Ah wow thats nice, thanks!

Answer 2

[Bram Schroeders]

Datapoints = 1000;

x = linspace(0,2*pi,Datapoints);
S = zeros(size(x));
hold all

for n = 1:11
    S = cos((n-1)*pi*x*(1/2));
    plot(x,S);
end

This should do the trick, you won't need the symbolic toolbox for this.

You can also save all the data by making a matrix out of S.

[Yuvraj Bhagotra]

Brilliant thanks!