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

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!

Answer 1

[Walter Roberson]

[theta, r] = cart2pol(X, Y);

[Ashfaq Ahmed]

Yes, perfect! Does it count from the first element? Also, how is the theta calculated (i.e., its dimension)?

[Walter Roberson]

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.