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Set new origin in polar coordinates

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Jiong Yang
Jiong Yang 2020년 5월 18일
댓글: Jiong Yang 2020년 5월 19일
Hi, I have a set of data in polar coordinates (r, theta). The default origin for matlab is (0,0). How I can change the origin to other points, such as (0,3)?
Thanks a lot.
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darova
darova 2020년 5월 18일
Can you plot data in cartesian system?

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Ameer Hamza
Ameer Hamza 2020년 5월 18일
편집: Ameer Hamza 2020년 5월 18일
One of the easiest ways I can think of is to convert the points from polar to cartesian, do the translation, and then convert back to polar. For example
r = 1;
theta = linspace(0, 2*pi, 100);
translate = [0 3];
x = r*cos(theta) + translate(1);
y = r*sin(theta) + translate(2);
r_trans = hypot(y, x);
theta_trans = atan2(y, x);
polarplot(theta_trans, r_trans)
Original:
Translated:
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Jiong Yang
Jiong Yang 2020년 5월 19일
Thank you very much, Ameer. Your anwser solves my problem!

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