MATLAB: I want this to run 3 times with values of p =5 10 and 20 and graph each of them in subplot instead of having p=input

MATLABsubplot

if true
  % code
end
t=linspace(-2,2,101);
xa=zeros(1,size(t,2));
xp=zeros(1,size(t,2));
p=input('please input value for p:');
for i=1:1:size(t,2)
  xa(i)=1-2*sin(pi*t(i))+cos(2*pi*t(i))+3*cos(3*pi*t(i));
end
for i=1:1:size(t,2)
  for k=-p:1:p
  Xa=1-2*sin(pi*2*k)+cos(2*pi*2*k)+3*cos(3*pi*2*k);
  s=6*pi*(t(i)-2*k);
  xp(i)=xp(i)+Xa*u_sinc(s);
  end
end
figure(2)
plot(t,xp,'b');
hold on
plot(t,xa,'r');

Best Answer

Try this:
t=linspace(-2,2,101);
xa=zeros(1,size(t,2));
xp=zeros(1,size(t,2));
figure(2)
p = [5 10 20];
for k1 = 1:length(p);
    for i=1:1:size(t,2)
        xa(i)=1-2*sin(pi*t(i))+cos(2*pi*t(i))+3*cos(3*pi*t(i));
    end
    for i=1:1:size(t,2)
        for k=-p:1:p
            Xa=1-2*sin(pi*2*k)+cos(2*pi*2*k)+3*cos(3*pi*2*k);
            s=6*pi*(t(i)-2*k);
            xp(i)=xp(i)+Xa*u_sinc(s);
        end
    end
    subplot(length(p),1,k1)
    plot(t,xp,'b');
    hold on
    plot(t,xa,'r');
    hold off
end
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