# How can I calculate the modulus and argument for every point in a plot?

조회 수: 4 (최근 30일)
Ashfaq Ahmed 2023년 4월 6일
댓글: Walter Roberson 2023년 4월 6일
Hi all,
Suppose, I have a scattered plot like this -
I want find out the θ, and r for every corresponding point. Can anyone please give me an idea on how to do that?
The X, Y values are in XY.mat file I added. Where,
X = xy(:,1);
Y = xy(:,2);
Any feedback will be highly appreciated!

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### 채택된 답변

Walter Roberson 2023년 4월 6일
[theta, r] = cart2pol(X, Y);
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Ashfaq Ahmed 2023년 4월 6일
편집: Ashfaq Ahmed 2023년 4월 6일
Yes, perfect! Does it count from the first element? Also, how is the theta calculated (i.e., its dimension)?
Walter Roberson 2023년 4월 6일
The values are calculated relative to (0,0) . If you want to calculate relative to some other point, subtract that other point from X and Y .
theta = atan2(Y, X) and so is radians.

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