for loops, how to see the effect of a parameter

Simplified version of moy code is somethig like this:

theta=2;
beta=8;
W=30;
bound=W./(theta+beta)
step=bound/1000;
R=[0:step:bound];
V=R.^2+3*theta+beta*W;
figure; plot(R,V); xlabel('R'); ylabel('V');

I would like to see the effect of theta. So for example theta= [2 4 6 ] Since bound, hence R range, depend on theta, the for loops or functions I write are not working. Any help on how to write the code is appreciated

Answer 1

[KALYAN ACHARJYA]

 theta=2; 
beta=8; 
W=30; 
bound=W./(theta+beta) 
step=bound/1000; 
R=[0:step:bound];
for theta=theta:10 % you can change this range
  V=R.^2+3*theta+beta*W; 
  plot(R,V); 
  hold on;
  theta=theta+2;
end
xlabel('R'); ylabel('V');
hold off;

[Lily]

I guess my previous answer is deleted. Thank you for your time. The problem is with this code the range for R is fixed. However in my problem, the range for R is changing as a function of theta, since "bound" is function of theta. Thanks