Re: [NTG-context] LMTX and addplot table

12 Dec 2020

      On 12/12/2020 12:19 PM, Jean-Philippe Rey wrote:
...
...
Le 12 déc. 2020 à 11:58, Hans Hagen mailto:j.hagen@xs4all.nl> a écrit :
On 12/12/2020 10:36 AM, Jean-Philippe Rey wrote:
...
Dear list,
I am unable to draw a plot using an external file with LMTX. Here is 
a minimal example
=====================
\usemodule[pgfplots]
\starttext
\starttikzpicture
\startaxis
\addplot table [x=t, y=E] {mfe-addplot.dat};
\stopaxis
\stoptikzpicture
\stoptext
=====================
The ConTeXt run fails with an "Undefined control sequence" error (see 
attached log file). I don't know if this is an LMTX or PGF issue. The 
example works fine with MkIV. I tried with the tikz version available 
on ConTeXt garden (pgf 3.0.1, pgfplots 1.16) and the last one from 
CTAN (pgf 3.1.7a, pgfplots 1.17) with the same result.
looks like \PackageError is undefined which is something PGF
but maybe you should
! Package pgfplots Warning: running in backwards compatibility mode 
(unsuitable tick labels; missing features). Consider writing 
\pgfplotsset{compat=1.17} into your preamble.
use that setting in order to not end up at that command
Thanks Hans, but it doesn't seem to change anything.
I am not really a tikz user but can run it here

wipe t-tikz.* on your machine in order to use m-tikz.mkiv in the 
distribution because it looks like it does a bad catcode table change 
... that went unnoticed because a chardef'd constant gets typeset (and 
when that happens before \starttext you won't see it but it actually 
does introduce some funny char); in lmtx we don't use chardef for that 
so that can give an error then when loading

anyway, you're not suffering from that i think but better use the right 
module loader anyway

then you can define the \PackageError macro (I did it with some trial 
and error but the next seems to work:

\let\PackageError\writestatus

so I'll add something like that to m-tikz.mkiv

after all that I get this:

PGFPlots: reading {mfe-addplot.dat}

pgfplots        > Sorry, could not retrieve column 't' from table 
'\\pgfplotstableread@filename@@table@name '. Please check spelling (or 
introduce name aliases).
pgfplots        > Sorry, could not retrieve column 'E' from table 
'\\pgfplotstableread@filename@@table@name '. Please check spelling (or 
introduce name aliases).
pgfplots        > Sorry, the requested column number '' in table 
'mfe-addplot.dat' does not exist!? Please verify you used the correct 
index 0 <= i < N.
pgfplots        > Sorry, the requested column number '' in table 
'mfe-addplot.dat' does not exist!? Please verify you used the correct 
index 0 <= i < N.
NOTE: coordinate (,) has been dropped because of a coordinate filter. 
(see also unbounded coords=jump).

pgfplots        > Sorry, the requested column number '' in table 
'mfe-addplot.dat' does not exist!? Please verify you used the correct 
index 0 <= i < N.
pgfplots        > Sorry, the requested column number '' in table 
'mfe-addplot.dat' does not exist!? Please verify you used the correct 
index 0 <= i < N.
NOTE: coordinate (,) has been dropped because of a coordinate filter. 
(see also unbounded coords=jump).

! Package pgfplots Warning: the current plot has no coordinates (or all 
have been filtered away)

  [warning /pgfplots/warning/plot without coordinates]

! Package pgfplots Warning: You have an axis with empty range (in 
direction y). Replacing it with a default range and clearing all plots.

  [warning /pgfplots/warning/empty range cleared axis]

which still looks bad but at least you don't crash .. i'll look into 
that later today (as i'm splitting mkiv/lmtx code i use a slightly 
different file reader so maybe that's it)

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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