Plotting only the positive radius for a polar graph

I want to plot a few polar curves, but I want MATLAB to ignore the negative values my function outputs for r. How can I do so?

EDIT: Figured out a way to do it through the following code

theta = 0:0.01:2*pi;
r = sin(2*theta);
for i=1:1:629
    if r(1,i) < 0
        r(1,i) = 0;
    else r(1,i) = r(1,i);
        i = i+1;
    end
end
polarplot(theta,r);

Is there a more efficient way to go about this though?

Answer 1

[Adam Danz]

"Is there a more efficient way to go about ths?"

Yes❕

All of that in the loop can be done with this one line,

r(r<0) = 0;

or, if you'd like to remove those values from the plot,

r(r<0) = NaN;

or if you'd like to remove those values completely,

theta(r<0) = []; 
r(r<0) = [];

[MuhammadAqdas110]

Perfect! Thank you!