thetamin/-max for polar plot  #328

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1. coolastro commented on Jan 16, 2012

   

   coolastro

   on Jan 16, 2012

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   On a similar note , I constantly face this problem and method to solve would be appreciated.
   and would like to have an extrapolation routine for theta domain.

   As mentioned in the previous comment that At the moment matplotlib only plots the full circle (360 degree).
   So if one has a theta domain from 0.01 to 2.0_pi-0.01 then it leaves white space (i.e. it does not complete the whole circle)
   One usually encounters such domains in numerical grid as starting the value of theta from 0.0 could lead to singularities.
   Is there any way to get rid of this white space by forcing the theta domain to start from 0.0 to 2.0_pi and extrapolating the associated 2D data on the polar axis?
2. ghost assigned

   pelson

   on Oct 18, 2012
3. mspacek commented on Dec 14, 2013

   

   mspacek

   on Dec 14, 2013

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   I wonder how much work this would be to implement. It seems the set_xlim() and set_ylim() axes methods for polar plots are supposed to control theta and r limits respectively. set_ylim works as expected for r, though unfortunately set_xlim() doesn't seem to have any effect at all, unless I'm doing something wrong.

   There's also a set_rlim() which seems to do the same as set_ylim(), and there are get_rmax and get_rmin methods, but strangely no get_rlim method.

   Seems example 2 and 3 in this demo show a way forward for doing less than a full 360 deg polar plot, and also for creating an annulus. Looks a bit complicated though:
   http://matplotlib.org/mpl_toolkits/axes_grid/users/overview.html#floating-axes

   Some discussion from 2008:
   http://comments.gmane.org/gmane.comp.python.matplotlib.general/14711
4. mspacek commented on Dec 17, 2013

   

   mspacek

   on Dec 17, 2013

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   I hacked together something that works well enough for me, based on the floating-axes demo from mpl_toolkits. Here's the code:

   https://github.com/neuropy/neuropy/blob/master/neuropy/scripts/polar_demo.py

   And a couple of example plots:

   
   
5. tacaswell

   added this to the v1.5.xThis milestone has been deleted milestone on Aug 18, 2014
6. tacaswell commented on Aug 18, 2014

   

   tacaswell

   on Aug 18, 2014

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   @mspacek Would you be willing to put that into a PR?

   Maybe this belongs in mpl_toolkit.
7. drrossum commented on Sep 8, 2014

   

   drrossum

   on Sep 8, 2014

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   +1
   I would be very interested in this feature too. Will use mspacek's routine for now
8. QuLogic commented on Jul 14, 2015

   

   QuLogic

   on Jul 14, 2015

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   So what's the actual way going forward here? Copying stuff from mpl_toolkit into the polar axes? (That code is ugly.)

   The best result (from a user perspective) would be being able to set theta min/max on a regular polar axes. Using mpl_toolkit is already in the examples and not particularly nice.
9. mspacek commented on Jul 14, 2015

   

   mspacek

   on Jul 14, 2015

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   I agree, I think it would be best to make this a feature of pylab.polar(). Even when I wrote it, I didn't understand some of the code in

   https://github.com/neuropy/neuropy/blob/master/neuropy/scripts/polar_demo.py

   which itself was mostly copied from mpl_toolkits:

   http://matplotlib.org/mpl_toolkits/axes_grid/users/overview.html#floating-axes

   I just got it to work through trial and error. So, I'm not sure I'm qualified to merge this into pyplot.polar().
10. story645

    added

    topic: polar

    on May 31, 2016
11. QuLogic

    self-assigned this

    on Nov 15, 2016
12. caichao commented on Jan 11, 2017

    

    caichao

    on Jan 11, 2017

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    wonderful works. @mspacek
13. efiring

    closed this as completedin #4699on Aug 21, 2017