matlab indexing issue with range -pi:pi

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Chetan Fadnis
Chetan Fadnis on 20 May 2022
Commented: Walter Roberson on 26 May 2022
I have following code, which i need to plot for alpha versus theta.
But i am unable to index it properly.
Kindly help. Thanks in anticipation. Regards
amin=0.2;
for theta=-3.1416:1.5708:3.1416 (-pi:pi/2:pi)
for gamma=0:0.5:3
phi=amin-(-pi/2);
alpha((?),(gamma*2)+1)=(1-amin)*(((sin(theta-phi)+1)/2).^gamma)+amin;
end
end

Accepted Answer

VBBV
VBBV on 20 May 2022
Edited: VBBV on 20 May 2022
amin=0.2;
theta = -pi:pi/2:pi;
gamma=0:0.5:3;
for T=1:length(theta)
for G = 1:length(gamma)
phi=amin-(-pi/2);
alpha(T,G)=((1-amin)*(((sin(theta(T)-phi)+1)/2).^gamma(G))+amin)/((gamma(G)*2)+1);
end
end
plot(theta,alpha)
xlabel('theta');ylabel('alpha')
  2 Comments
Walter Roberson
Walter Roberson on 26 May 2022
The maximum value is 1 exactly and it is being plotted. You need to ylim([0 1.1])

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