Theta phi positive and negative conventions and conversions

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Albert
Albert 2021-8-3
评论： Albert 2021-8-5
Hi, how can I convert any (theta_i,phi_i) angular coordinate so that it is restricted only to values where theta_i goes from 0º to 180º and phi from 0º to 360º ? My inmediate answer would be just to add 360º to any negative angle, but this may not be completely correct because it is possible that I need to change the other angle even if positive? Thanks

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Alan Stevens
Alan Stevens 2021-8-3
Try
mod(theta,180)
and
mod(phi,360)
  1 个评论
Albert
Albert 2021-8-5
Thanks! I may need to think further on this, because it's a matter of coordinate system definition in fact. If I define theta -90 to 90 instead of 0 to 180, then maybe the phi angle needs to adapt accordingly. Other than that your answer makes sense.

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