how can i plot all for loop's values

Question

mohamed saber 2011-10-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/18226-how-can-i-plot-all-for-loop-s-values

i made a for loop programe ,but when i make plot for value .. the result is point .. how can i save all value of for loop and plot them ??

clear,clc
for th=-25:.1:50;
  fai=atand(((750+450.*sin(th)))./(450.*cosd(th)));
  force=(4000*cosd(th)*1500)/(450*sind(fai));
  l=450*cosd(th)/cosd(fai);
  plot(th,force)
end

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Answer 1

mohammad Al-Kayyali 2011-10-13

2
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hi mo ,

Try to use dummy variable to save your data then use the plot function as follows :

z=1;for th=-25:.1:50;
  fai=atand(((750+450.*sin(th)))./(450.*cosd(th)));
  force=(4000*cosd(th)*1500)/(450*sind(fai));
  thdummy(z)=th;
  forcedummy(z)=force;
z=z+1;
l=450*cosd(th)/cosd(fai);
end
plot(thdummy,forcedummy)

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Answer 2

Matt Tearle 2011-10-13

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Why are you using a for-loop at all? These are all vectorized operations.

th=-25:.1:50; 
fai=atand(((750+450.*sind(th)))./(450.*cosd(th))); 
force=(4000*cosd(th)*1500)./(450*sind(fai)); 
l=450*cosd(th)./cosd(fai); 
plot(th,force)

Note the use of the elementwise multiply and divide everywhere.

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Sean de Wolski 2011-10-13

Matt vectorized your statements so you don't need a for-loop.

Matt Tearle 2011-10-13

Run the code I posted, then check your workspace. The first line creates a vector of values for th. Then fai, force, and l are also vectors, because all operations are performed element-by-element. No loops required. That's MATLAB for you.

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