Hi,
Sorry to restart the discussion, but I have updated my entire system and the problem remains. I used the example of Aditya.
Thank you.
Fabrice

\usemodule[pgfplots]
\starttext
\starttikzpicture
   \startaxis
     \addplot {x};
   \stopaxis
\stoptikzpicture
\stoptext

tex error       > tex error on line 5 in file pgfplotsbinary.data.code.tex: ! Undefined control sequence

l.5 ...ode`\^0=11    \expandafter\xdef\csname pgfp@bin@\the\counter \endcsname{^0
                                                                                }\advance\counter by1
lua error:

?


Le jeu. 9 avr. 2020 à 00:07, Aditya Mahajan <adityam@umich.edu> a écrit :
On Wed, 8 Apr 2020, Aditya Mahajan wrote:

> Simpler example:

Sorry, pasted the wrong thing:

\usemodule[pgfplots]

\starttext
\starttikzpicture
   \startaxis
     \addplot {x};
   \stopaxis
\stoptikzpicture
\stoptext

> Works with LMTX 2019.12.31 but fails with the most recent LMTX (same error as
> below) using the same pgfplots module.
>
> Aditya
>
> On Wed, 8 Apr 2020, Fabrice Couvreur wrote:
>
>> Hi Henri,
>> Sorry !
>>
>> \usemodule[pgfplots]
>> \pgfplotsset{compat=newest}
>> \starttext
>> \starttikzpicture
>>  \startaxis
>>    [
>>      xlabel=$x$,
>> ylabel={$f(x) = x^2 - x +4$}
>>    ]
>>    \addplot {x^2 - x +4};
>>  \stopaxis
>> \stoptikzpicture
>> \stoptext
>>
>>
>> tex error       > tex error on line 5 in file pgfplotsbinary.data.code.tex:
>> ! Undefined control sequence
>>
>> l.5 ...ode`\^0=11    \expandafter\xdef\csname pgfp@bin@\the\counter
>> \endcsname{^0
>>
>>    }\advance\counter by1
>> lua error:
>>
>> ?
>>
>>
>> Le mer. 8 avr. 2020 à 12:40, Henri Menke <henrimenke@gmail.com> a écrit :
>>
>>> MINIMAL working example...
>>>
>>> Cheers, Henri
>>>
>>> On 08/04/20, 11:52, Fabrice Couvreur wrote:
>>>> Hi Henri,
>>>> This file works well with context but does not work with lmtx.
>>>>
>>>> \usemodule[pgfplots]
>>>> \usemodule[pgfpltstable]
>>>> \pgfplotsset{compat=newest}
>>>> \starttext
>>>> \starttikzpicture
>>>> \startaxis[
>>>>     title={\bf Relevé de notes chronologique},
>>>>     ymajorgrids=true,
>>>>     grid style={cyan!30},
>>>>     ymin=0,
>>>>     ymax=22,
>>>>     xmin=0,
>>>>     xmax=14,
>>>>     x=1cm,
>>>>     y=0.3cm,
>>>>     axis x line =bottom,
>>>>     axis y line =left,
>>>>     axis on top=true,
>>>>     axis line style =very thick,
>>>>     tick align=outside,
>>>>     tickwidth=0.12cm,
>>>>     tick style=very thick,
>>>>     xtick={\empty},
>>>>     ytick={0,2,...,18,20},
>>>>     extra x ticks={2,5,7,9,11,13},
>>>>     extra x tick labels={octobre,novembre,janvier,mars,avril, juin},
>>>>     extra x tick style={tick label style={rotate=45}},
>>>>     extra tick style={tick style={draw=none}},
>>>>     xlabel={Date},ylabel={Note},
>>>>     xlabel={Date},ylabel={Effectif},
>>>>  every axis x label/.style={
>>>>  at={(ticklabel* cs:1.01)},
>>>>  anchor=west,
>>>>  },
>>>>  every axis y label/.style={
>>>>  at={(ticklabel* cs:1.01)},
>>>>  anchor=south,
>>>>  },
>>>>  samples=1000,
>>>> >=stealth,
>>>> ]
>>>> \addplot [color=green,only marks] coordinates {
>>>>   (1,5)
>>>>   (2,7)
>>>>   (3,5)
>>>>   (4,10)
>>>>   (5,5)
>>>>   (6,8)
>>>>   (7,10)
>>>>   (8,8)
>>>>   (9,10)
>>>>   (10,14)
>>>>   (11,18)
>>>>   (12,14)
>>>>   (13,11)
>>>> };
>>>> \stopaxis
>>>> \stoptikzpicture
>>>> \stoptext
>>>>
>>>>
>>>> open source     > level 7, order 88, name 'pgfplotsbinary.data.code.tex'
>>>>
>>>> tex error       > tex error on line 5 in file
>>> pgfplotsbinary.data.code.tex:
>>>> ! Undefined control sequence
>>>>
>>>> l.5 ...ode`\^0=11    \expandafter\xdef\csname pgfp@bin@\the\counter
>>>> \endcsname{^0
>>>>
>>>>     }\advance\counter by1
>>>> lua error:
>>>>
>>>> ?
>>>>
>>>>
>>>>
>>>> <empty file>
>>>>
>>>>
>>>> The control sequence at the end of the top line of your error message was
>>>> never
>>>> \def'ed. You can just continue as I'll forget about whatever was
>>> undefined.
>>>>
>>>>
>>>> mtx-context     | fatal error: return code: 256
>>>>
>>>> TeX Output exited abnormally with code 1 at Wed Apr  8 11:49:56
>>>>
>>>>
>>>> Le mer. 8 avr. 2020 à 11:21, Henri Menke <henrimenke@gmail.com> a écrit
>>> :
>>>>
>>>>> Hi Fabrice,
>>>>>
>>>>> Could you provide a MWE, or maybe even open an issue on the bugtracker?
>>>>> https://github.com/pgf-tikz/pgfplots/issues
>>>>>
>>>>> Cheers, Henri
>>>>>
>>>>> On 07/04/20, 14:22, Fabrice Couvreur wrote:
>>>>>> Hi Henri,
>>>>>> Thank you for answering me. We're entering an area that I don't
>>> really
>>>>> know. I
>>>>>> replaced all ^^ by ^ but I'm not sure I understood. I now have the
>>>>>> following message :
>>>>>> Thank you
>>>>>> Fabrice
>>>>>>
>>>>>> tex error       > tex error on line 5 in file
>>>>> pgfplotsbinary.data.code.tex:
>>>>>> ! Undefined control sequence
>>>>>>
>>>>>> l.5 \catcode`\^00=11 \expandafter\xdef\csname pgfp@bin@\the\counter
>>>>>> \endcsname{^0
>>>>>>
>>>>>>    0}\advance\counter by1
>>>>>> lua error:
>>>>>>
>>>>>> ?
>>>>>>
>>>>>>
>>>>>>
>>>>>> <empty file>
>>>>>>
>>>>>>
>>>>>> The control sequence at the end of the top line of your error
>>> message was
>>>>>> never
>>>>>> \def'ed. You can just continue as I'll forget about whatever was
>>>>> undefined.
>>>>>>
>>>>>>
>>>>>> mtx-context     | fatal error: return code: 256
>>>>>>
>>>>>> TeX Output exited abnormally with code 1 at Tue Apr  7 14:15:58
>>>>>>
>>>>>> Le mar. 7 avr. 2020 à 04:21, Henri Menke <henrimenke@gmail.com> a
>>> écrit
>>>>> :
>>>>>>
>>>>>>> The problem is that pgfplots uses the ^^ syntax to access
>>> characters
>>>>> but
>>>>>>> this relies on ^ having catcode 7 which is not the case by default
>>> in
>>>>>>> ConTeXt.  I had a similar issue in PGF before and that was fixed by
>>>>> just
>>>>>>> replacing the ^^ syntax with the ascii code constants from
>>>>>>> syst-ini.mkxl.
>>>>>>>
>>>>>>> Cheers, Henri
>>>>>>>
>>>>>>> On 06/04/20, 22:23, Fabrice Couvreur wrote:
>>>>>>>> Hi,
>>>>>>>> Still with the idea of using lmtx, I get a compilation error
>>> when I
>>>>> use
>>>>>>>> pgfplots.
>>>>>>>> Thank you.
>>>>>>>> Fabrice
>>>>>>>> ####################################################
>>>>>>>> open source     > level 9, order 92, name
>>>>> 'pgfplotsbinary.data.code.tex'
>>>>>>>>
>>>>>>>> tex error       > tex error on line 42 in file
>>>>>>>> pgfplotsbinary.data.code.tex: ! Undefined control sequence
>>>>>>>>
>>>>>>>> l.42 \catcode`\ =11^^I\expandafter\xdef\csname pgfp@bin@
>>>>>>>>
>>>>>>>> \the\counter^^I\endcsname{^^20}\endgroup\advance\counter by1
>>>>>>>> lua error:
>>>>>>>>
>>>>>>>> ?
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> <empty file>
>>>>>>>>
>>>>>>>>
>>>>>>>> The control sequence at the end of the top line of your error
>>>>> message was
>>>>>>>> never
>>>>>>>> \def'ed. You can just continue as I'll forget about whatever was
>>>>>>> undefined.
>>>>>>>>
>>>>>>>>
>>>>>>>> mtx-context     | fatal error: return code: 256
>>>>>>>>
>>>>>>>> TeX Output exited abnormally with code 1 at Mon Apr  6 22:19:01
>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>
>>> ___________________________________________________________________________________
>>>>>>>> If your question is of interest to others as well, please add an
>>>>> entry
>>>>>>> to the Wiki!
>>>>>>>>
>>>>>>>> maillist : ntg-context@ntg.nl /
>>>>>>> http://www.ntg.nl/mailman/listinfo/ntg-context
>>>>>>>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
>>>>>>>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>>>>>>>> wiki     : http://contextgarden.net
>>>>>>>>
>>>>>>>
>>>>>
>>> ___________________________________________________________________________________
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>
>>> ___________________________________________________________________________________
>>>>>>> If your question is of interest to others as well, please add an
>>> entry
>>>>> to
>>>>>>> the Wiki!
>>>>>>>
>>>>>>> maillist : ntg-context@ntg.nl /
>>>>>>> http://www.ntg.nl/mailman/listinfo/ntg-context
>>>>>>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
>>>>>>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>>>>>>> wiki     : http://contextgarden.net
>>>>>>>
>>>>>>>
>>>>>
>>> ___________________________________________________________________________________
>>>>>>>
>>>>>
>>>>>>
>>>>>
>>> ___________________________________________________________________________________
>>>>>> If your question is of interest to others as well, please add an
>>> entry
>>>>> to the Wiki!
>>>>>>
>>>>>> maillist : ntg-context@ntg.nl /
>>>>> http://www.ntg.nl/mailman/listinfo/ntg-context
>>>>>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
>>>>>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>>>>>> wiki     : http://contextgarden.net
>>>>>>
>>>>>
>>> ___________________________________________________________________________________
>>>>>
>>>>>
>>>>>
>>> ___________________________________________________________________________________
>>>>> If your question is of interest to others as well, please add an entry
>>> to
>>>>> the Wiki!
>>>>>
>>>>> maillist : ntg-context@ntg.nl /
>>>>> http://www.ntg.nl/mailman/listinfo/ntg-context
>>>>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
>>>>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>>>>> wiki     : http://contextgarden.net
>>>>>
>>>>>
>>> ___________________________________________________________________________________
>>>>>
>>>
>>>>
>>> ___________________________________________________________________________________
>>>> If your question is of interest to others as well, please add an entry
>>> to the Wiki!
>>>>
>>>> maillist : ntg-context@ntg.nl /
>>> http://www.ntg.nl/mailman/listinfo/ntg-context
>>>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
>>>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>>>> wiki     : http://contextgarden.net
>>>>
>>> ___________________________________________________________________________________
>>>
>>>
>>> ___________________________________________________________________________________
>>> If your question is of interest to others as well, please add an entry to
>>> the Wiki!
>>>
>>> maillist : ntg-context@ntg.nl /
>>> http://www.ntg.nl/mailman/listinfo/ntg-context
>>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
>>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>>> wiki     : http://contextgarden.net
>>>
>>> ___________________________________________________________________________________
>>>
>___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________