I want to plot!!!

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혜승 주
혜승 주 2020 年 5 月 17 日
コメント済み: 혜승 주 2020 年 5 月 18 日
[x,y]=meshgrid(-20:0.1:20);
m=2;
U=2;
a=4;
psi = U*y - (m/(2*pi))*(atan(y/(x-a))-atan(y/(x+a)));
contour(x,y,psi);
but I can't get my graphs. They are all blank page.

採用された回答

Ameer Hamza
Ameer Hamza 2020 年 5 月 17 日
編集済み: Ameer Hamza 2020 年 5 月 17 日
You need to use element-wise division: https://www.mathworks.com/help/matlab/ref/rdivide.html
[x,y]=meshgrid(-20:0.1:20);
m=2;
U=2;
a=4;
psi = U*y - (m/(2*pi))*(atan(y./(x-a))-atan(y./(x+a)));
%^ dot here and ^ here
contour(x,y,psi);
  1 件のコメント
혜승 주
혜승 주 2020 年 5 月 18 日
This really helped!! Thanks a lot!! 8ㅁ8

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その他の回答 (1 件)

dpb
dpb 2020 年 5 月 17 日
You left out some very key information MATLAB told you about...
...
contour(x,y,psi);
Warning: Matrix is singular to working precision.
Warning: Matrix is singular to working precision.
Warning: Contour not rendered for non-finite ZData
>> In contour (line 51)
That's a very big klew you didn't do something right!!!
And, what that is, is that you used the ordinary '*' and '/' operators in defining psi when you wanted and needed the dot operators for element-by-element operations. Use
psi = U*y - (m/(2*pi)).*(atan(y./(x-a))-atan(y./(x+a)));
instead and joy will ensue...
  1 件のコメント
혜승 주
혜승 주 2020 年 5 月 18 日
I should carefully read those! Thank you!!

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