multiple r values for multiple theta values

theta=[pi,3,2.8,2.5,2,pi/2,1.3,1.0,0.75,0.5];
r=(pi-theta)/(sin(theta))
x=r*cos(theta)
y=r*sin(theta)
plot(x,y)

I was wondering how I can get it to give a different r value for each theta value. For example

theta=pi r=0 x=0 y=0

theta=3 r=1.0033 x=-0.9933 y=0.1416

theta=2.8 r=1.0197 x=-0.9608 y=0.3416

each theta value is used to get a differnt r value that is then used to get a different x and y point. Currently it only gives one r value and keeps using it for the differnt inputs. It should give a different r values for each theta value. Thank you.

Answer 1

[David Goodmanson]

Hi Allan

For an element-by-element calculation, use ./ and .* rather than / and *

theta=[pi,3,2.8,2.5,2,pi/2,1.3,1.0,0.75,0.5];
r=(pi-theta)./(sin(theta))
x=r.*cos(theta);
y=r.*sin(theta);
plot(x,y)

 r =
 0    1.0033    1.0197    1.0721    1.2555    1.5708    1.9112    2.5451    3.5086   5.5099

[Allan Asturias]

thank you very much!!