negative polar axis

[Steve Holden]

yadin wrote:
> hi!
> how can i do polar plot in python with negative axes
> that is the value of the magnitude is negative
> 
Surely a negative magnitude doesn't make sense in polar coordinates, 
since the magnitude is supposed to represent the distance from the center.

About the best interpretation I can think of is to add 180 degrees to 
the angle and reverse the sign of the magnitude, but this would be a 
hack. Where are those coordinates coming from?

regards
  Steve
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