[NTG-context] Polar pgfplots seems to be broken

[Aditya Mahajan]

On Sun, 20 Dec 2020, Gavin wrote:

> Hello,
> 
> I’m drawing solar system diagrams using the pgfplots module, but the polar library seem to be broken. It looks like it is calling something with a \begin{axis}... command. Here is the error message for a short document, included below.
> 
> > tex error       > tex error on line 18 in file /Users/Gavin/Documents/Computer/ConTeXt/Polar Plot Experiments/Untitled.tex: ! Undefined control sequence
> > 
> > \pgfplots at environment@polaraxis@ [#1]->\begin 
> >                                              {axis}[#1,data cs=polar,axis type=polar]
> > l.18 		\startpolaraxis[]
> > 
> > 16     \startsection[title={Polar Plot}]
> > 17     	\starttikzpicture	% tikz code
> > 18 >>  		\startpolaraxis[]
> > 19     			\addplot+[mark=none,domain=0:720,samples=600]{sin(4*x)};
> > 20     		\stoppolaraxis
> > 21     	\stoptikzpicture
> > 22     \stopsection
> > 
> > mtx-context     | fatal error: return code: 256
> 
> I’d love a fix or an idea for a work around. 

This is a bug in pgfplots macro pgfplotsdefineaxistype, which uses an explicit \begin{axis} ... \end{axis} instead of the more portable \axis ... \endaxis. Attached is a quick fix, but it has been quite a while since I looked at pgfplots code, so it may be better to post a bug-report on pgfplots mailing list for a proper fix.

Aditya

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