how can i plot all for loop's values

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mohamed saber
mohamed saber 2011-10-13
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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回答（2 个）

mohammad Al-Kayyali
mohammad Al-Kayyali 2011-10-13
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)
Matt Tearle
Matt Tearle 2011-10-13
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
Sean de Wolski 2011-10-13
Matt vectorized your statements so you don't need a for-loop.
Matt Tearle
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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