multiple graphs plotting error
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ro=10;
ri=30;
t=0:0.1:2000;
ci=0.5
c_L=(ci*ri)/ro.*(1-exp(1).^((-ro.*t./((ri-ro).*t+1500))));
plot(t,c_L)
hold on
ro=15;
ri=25;
c_L=(ci*ri)/ro.*(1-exp(1).^((-ro.*t./((ri-ro).*t+1500))));
plot(t,c_L)
ro=25;
ri=15;
c_L=(ci*ri)/ro.*(1-exp(1).^((-ro.*t./((ri-ro).*t+1500))));
plot(t,c_L)
For the interval t it should be 0 to 2000, but when I run MATLAB with that interval graph looks very weired
However, with interval 0 to 100 looks fine.
What should I do?
采纳的回答
Star Strider
2021-1-24
The ‘t’ vector for the first series of curves is:
t=0:0.1:100;
and for the second:
t=0:0.1:2000;
That likely explains the difference.
To plot ‘t’ from 0 to 2000, define ‘t’ over the desired range.
6 个评论
Jong Hyun Lee
2021-1-24
Star Strider
2021-1-24
The problem is in the third plot of your original (unedited Question — I saved the previous code), specifically:
ro=25;
ri=15;
c_L=(ci*ri)/ro.*(1-exp((-ro.*t./((ri-ro).*t+1500))));
plot(t,c_L)
In the previous plots, (ro < ri) so the difference (ri-ro) was positive and the code gave you the result you want. With (ro > ri), the exponent becomes positive, and when ‘t’ is 150.6, ‘c_L’ is 
. I have no idea what you are calculating here, however so long as 
you should get the sort of result you want.
. I have no idea what you are calculating here, however so long as you should get the sort of result you want.
Jong Hyun Lee
2021-1-25
Star Strider
2021-1-25
You certainly can draw it. You just need to be prepared for results that may not be what you want. Or alternatively, use ylim to restrict the display to only positive values of ‘c_L’.
Jong Hyun Lee
2021-1-25
Star Strider
2021-1-25
As always, my pleasure!
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