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

Question

Pranjal Pathak 2013-7-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/81266-how-to-plot-a-2d-graph-using-all-the-for-loop-values

评论： Anders Kipp 2016-2-15

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!

1 个评论
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Anders Kipp 2016-2-15

great help

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Answer 1

Azzi Abdelmalek 2013-7-6

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/81266-how-to-plot-a-2d-graph-using-all-the-for-loop-values#answer_90974

编辑：Azzi Abdelmalek 2013-7-6

在 MATLAB Online 中打开

Your errors:

you can not use a negative index
when you write for w=-20:20, at the end of the loop w=20, is just one value
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)