How to plot a 2D graph using all the for loop values

2013 7 6
1 个回答
回答已采纳
更新时间：2016 2 15
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Hi, I have the following equation to be plotted in Matlab:
***************
alp=1;
K=1;
E0=1;
for w=-20:1:20;
a=K*(cos(pi*alp/2)*w^alp+w^(2*alp));
b=1+2*(cos(pi*alp/2)*w^alp+w^(2*alp));
c=a/b;
E(w)=E0*(1+c);
end
figure(1)
plot(E,w)
xlabel('w');
ylabel('E');
title('Plot of E vs w')
*********
Can anyone tell me what is wrong in the above code, as I am unable to get the plot.
Thanking You!

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 采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-7-6
编辑：Azzi Abdelmalek 2013-7-6

3 个投票

Your errors:
  1. you can not use a negative index
  2. when you write for w=-20:20, at the end of the loop w=20, is just one value
  3. you should use plot (w,E) instead of plot(E,w)
alp=1;
K=1;
E0=1;
E=[];
for w=-20:1:20;
a=K*(cos(pi*alp/2)*w^alp+w^(2*alp));
b=1+2*(cos(pi*alp/2)*w^alp+w^(2*alp));
c=a/b;
E(end+1)=E0*(1+c);
end
figure(1)
w=-20:20
plot(w,E)
xlabel('w');
ylabel('E');
title('Plot of E vs w')t(E,w)

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