Plotting data from for loop

Question

Alec Carruthers 2017-4-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/333475-plotting-data-from-for-loop

评论： KSSV 2017-4-5

Here is my code:

T=290;
R=287;
G=1.4;
Cv= R/(G-1);
e=Cv*T;
V= (0:1:1000);
Ke= .5*(V.^2);
for i = 1:1:length(V)
      Ratio(i)= Ke(i)/e;
      plot(Ratio);
      hold on
  end

Basically I want to plot "Ratio" with all of the stored Ke values on the graph. When I run the code, it gives me a thousand sets of a thousand entries instead of just 1 set with a thousand entries. All of the sets are the same, I just don't know why it is producing that many sets.

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Answer 1

KSSV 2017-4-4

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/333475-plotting-data-from-for-loop#answer_261620

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It is because, you are plotting Ratio inside the loop and you have not mentioned the X data. You can plot Ratio outside the loop.

T=290;
R=287;
G=1.4;
Cv= R/(G-1);
e=Cv*T;
V= (0:1:1000);
Ke= .5*(V.^2);
Ratio = zeros(size(V)) ;
for i = 1:1:length(V)
    Ratio(i)= Ke(i)/e;
end
plot(Ratio);