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!
> > > > > >
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> > > > >
> > >
> ___________________________________________________________________________________
> > > > > If your question is of interest to others as well, please add an
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> > > to
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> > > >
> > >
> ___________________________________________________________________________________
> > > > If your question is of interest to others as well, please add an
> entry
> > > to the Wiki!
> > > >
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> > > http://www.ntg.nl/mailman/listinfo/ntg-context
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> > >
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> > > 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
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> > >
> > >
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> > >
>
> >
> ___________________________________________________________________________________
> > 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
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> > 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
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> archive  : https://bitbucket.org/phg/context-mirror/commits/
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>