multiple r values for multiple theta values

Question

Allan Asturias 2021-3-6

0
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https://ww2.mathworks.cn/matlabcentral/answers/764521-multiple-r-values-for-multiple-theta-values

评论： Allan Asturias 2021-3-7

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.

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Answer 1

David Goodmanson 2021-3-6

1
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https://ww2.mathworks.cn/matlabcentral/answers/764521-multiple-r-values-for-multiple-theta-values#answer_640456

编辑：David Goodmanson 2021-3-6

在 MATLAB Online 中打开

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