Having trouble graphing multiple subplots while using a for loop. Please help! Much appreciated

I need to plot a equation for a few different values of n with x in a specific range. I need to plot these on three seperate subplots while using a for loop. This is what I have so far:

n=[4 2 1];
x=-5:5;
y=0
hold on
for k=1:length(n);
    for j=1:length(x)
        y=n(k).*cos(x(j));
        subplot(1,3,k);
        plot(x,y,'-Xb');
    end
end

The only issue is that I keep getting a single constant value for y for each of my plots? How do I get the graphs to come out correctly?

Any help is much appreciated. Thanks!

Answer 1

[Stephen23]

You have created too many loops. Only the outer loop in needed, the inside one should be replaced by a simple vectorized operation:

n = [4,2,1];
x = -5:5;
for k = 1:length(n);
  y = n(k).*cos(x);
  subplot(1,3,k);
  plot(x,y,'-xb');
end