limit range of loop iteration

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Aamna Alshehhi
Aamna Alshehhi 2019-10-3
评论： Jess Lovering 2019-10-3
I got this code to plot Th2 vs Th3 and Th4 but I wanna limit the range of Th2 which is " i " to (0 to 47) and (313 to 360).
also I wanna get path coordinates of point P to same range.
any suggetions?
for i=0:47;
d =3.5; a = 4;b = 2; c = 1;
Th1= 0;
Z = d*exp(1i*deg2rad(Th1))- a*exp(1i*deg2rad(i));
Zc = conj(Z);
Ka = c*Zc; Kb = Z*Zc + c^2 -b^2; Kc = c*Z;
T = roots([ Ka Kb Kc]);
S = (c*T+Z)/b;
Th3(:,i+1) = rad2deg(angle(S));
Th4 (:,i+1) = rad2deg(angle(T));
P= a*exp(1i* deg2rad(Th2))+ 6*exp(1i* deg2rad(Th3-20));
end
Th2 = 0:47;
figure(1)
plot (Th2,Th3(1,:));
hold on;
plot (Th2,Th3(2,:));
xlabel ('TH)')
ylabel ('TH3')
figure(2)
plot (Th2,Th4(1,:));
hold on;
plot (Th2,Th4(2,:));
xlabel ('TH2') ;
ylabel ('TH4') ;
  2 个评论
David Hill
David Hill 2019-10-3
It would be nice to see the variables in a .mat file. It is hard to understand what you are trying to do here.

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采纳的回答

Jess Lovering
Jess Lovering 2019-10-3
Do you mean that you want your loop to go through i = 0 to 47 and then 313 to 360? If that is what you want then you can just replace the line:
for i=0:47;
with
for i=[0:47 313:360];
Is that your goal? If not, maybe you can provide some more detail. Thanks.

更多回答（1 个）

Aamna Alshehhi
Aamna Alshehhi 2019-10-3
yeah that's what I meant. Thanks!
  2 个评论
Aamna Alshehhi
Aamna Alshehhi 2019-10-3
I did this but i got an error:
Error using plot
Vectors must be the same length.
Error in hw4_Pc (line 19)
plot (Th2,Th3(1,:));
Jess Lovering
Jess Lovering 2019-10-3
It is difficult to help since we don't have the Th2 variable. Plus, it looks like it is redefined after the loop to be 0:47 so then it is shorter than the variable Th3 that is generated in the loop. You could also define it as Th2 = 0:360 to make it the same size, but I think that may not be what you are trying to view.

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