[Paraview] [EXTERNAL] Calculating cylindrical coordinates

[Scott, W Alan]

Are there places on the cylinder you are calling atan2 with the same inputs, returning the same data, lots of times?  Alternatively, could you calculate this in the simulation, and just add it to the simulation output?  I am speculating that a C++ call to atan2 may be faster than numpy?

Alan

From: ParaView [mailto:paraview-bounces at public.kitware.com] On Behalf Of Dennis Conklin
Sent: Friday, April 27, 2018 1:39 PM
To: Paraview (paraview at paraview.org) <paraview at paraview.org>
Subject: [EXTERNAL] [Paraview] Calculating cylindrical coordinates

All,

If I wanted to run atan2(X,Y) on millions and millions of nodes to calculate cylindrical coordinates, but found that numpy.atan2 in a Programmable Filter was taking 45 minutes to run,   what should I do to make it much faster?

Thanks for any hints

Dennis
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