limit range of loop iteration

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') ;

[David Hill]

It would be nice to see the variables in a .mat file. It is hard to understand what you are trying to do here.

[Aamna Alshehhi]

here you go. this m file

Answer 1

[Jess Lovering]

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.

Answer 2

[Aamna Alshehhi]

yeah that's what I meant. Thanks!

[Aamna Alshehhi]

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]

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.