ntg-context November 2020

ntg-context@ntg.nl

61 participants
170 discussions

Using ConTeXt-LMTX for modern Mathematically-Literate-Programming 2/2
by Stephen Gaito 30 Nov '20

30 Nov '20

Hello (again), This email is further to my previous "Using ConTeXt-LMTX for modern Mathematically-Literate-Programming 1/2" email... My ultimate goal in using ConTeXt-LMTX as a Mathematically-Literate-Programming tool, is to actually write a kernel "Mathematical Language" in ANSI-C (wrapped in Lua) which is then imported back into ConTeXt-LMTX as a standard Lua module (with an ANSI-C shared library). This would allow the output of "code" in my "Mathematical Language" to be directly embedded/typeset in the output of my Mathematical document. (The ultimate goal is to ensure that there is NO wishful thinking that the code is "correct" ("just trust me")... all results would be directly visible in the PDF). Alas, while, for other reasons, trying to use the Lua-CJSON Lua module from within ConTeXt-LMTX (which also makes use of a shared library written in C), I find that the current ConTeXt-LMTX is missing (among potentially others) the `lua_checkstack` symbol: > ...Xt/tex/texmf-context/tex/context/base/mkiv/l-package.lua:333: error > loading module 'cjson' from file '/usr/local/lib/lua/5.4/cjson.so': > /usr/local/lib/lua/5.4/cjson.so: undefined symbol: lua_checkstack even when using the ConTeXt/LuaMetaTeX `--permiteloadlib` switch. (Note that this Lua-CJSON module does work with the native 5.4 Lua). (The ConTeXt I am using identifies itself as: ConTeXt ver: 2020.11.25 19:18 LMTX fmt: 2020.11.25 int: english/english) I note that the output of `luametatex --help` includes the following statement: > Loading libraries is blocked unless one explicitly permits it (will > be in 2.08+): > > --permitloadlib permit loading of external libraries (coming) ---- QUESTIONS: 1. Is this an oversight and `--permitloadlib` is meant to be working now? 2. Is this a trivial fix (and might be fixed soon -- time permitting)? 3. Is this a rather complex refactoring of the code/build system (and hence might take some time before a fix can be rolled out)? 4. Is this a case of "the `lua_checkstack` symbol will never be part of luametatex"? ---- Any of the above scenarios is OK (though scenario 4 would be a disappointment as it means no shared library lua modules could be used in ConTeXt)... ... it would however be useful to have an idea of which scenario is most likely. Again Many thanks for a wonderful (and stable) tool! Regards, Stephen Gaito

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mathmatrix and internal lines
by Jean-Philippe Rey 30 Nov '20

30 Nov '20

Dear list, I would like to draw matrices with internal lines as can be done with LaTeX (cf pdf output) : ======================== \documentclass{article} \begin{document} $M =\left( \begin{array}{c|c} A & B \\ \hline C & D \\ \end{array} \right)$ \end{document} ======================== I didn't find out how to use mathmatrix to achieve this. My best result to date is ======================== \starttext $M = \left( \bTABLE[frame=off] \bTR \bTD[rightframe=on, bottomframe=on] $A$ \eTD \bTD[bottomframe=on] $B$ \eTD \eTR\bTR \bTD[rightframe=on] $C$ \eTD \bTD $D$ \eTD \eTR \eTABLE \right)$ \stoptext ======================== The code is rather ugly, and I get a spurious space at the bottom of the table. Any hints? Thank you, -- Jean-Philippe Rey jean-philippe.rey(a)centralesupelec.fr 91192 Gif-sur-Yvette Cedex - France Empreinte PGP : 807A 5B2C 69E4 D4B5 783A 428A 1B5E E83E 261B BF51

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new lmtx
by Hans Hagen 30 Nov '20

30 Nov '20

Hi, A new upload ... a few lua files cleaned up (stale code removed and so) ... hopefully for the best. Hans ----------------------------------------------------------------- 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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Several lines under a limit
by Fabrice Couvreur 28 Nov '20

28 Nov '20

Hi, Is there a command that allows to write multiple lines under the command \lim ? I tried but ... Cordially Fabrice \starttext \startformula \lim_{ \vbox{\startalign \NC x \to 2 \NR \NC x > 2 \NR \stopalign}}=+\infty \stopformula \stoptext

2 2

inbetween in \setupnotation
by Pablo Rodriguez 27 Nov '20

27 Nov '20

Dear list, I have the following sample: \setupnotation[footnote] [before={\blackrule[color=red]}, after={\blackrule[color=blue]}, inbetween={\blackrule[color=green]}] \starttext \dorecurse{18}{a\footnote{b} } \stoptext I wonder why the green rule isn’t shown. I mean, I would expect to see it between footnotes. What am I missing or doing wrong? Many thanks for your help, Pablo -- http://www.ousia.tk

2 2

Setting and measuring boxes TeX/Lua
by Jano Kula 27 Nov '20

27 Nov '20

Hello! I would like to set framed boxes, measure their dimensions and proceed based on the measurement. It is a combination of TeX and Lua ends. - Boxes are set on the TeX side. Stacking boxes (hbox, framed, vbox) in Lua looked too complex. - The content of the inner box is set on the Lua side (some computations). On TeX side boxes and their dimensions are accessible, but not at Lua side, until luacode is finished (iterations over boxes happen here). I would say Hans already named the problem in the list: *that is always tricky as what happens is postponing till the group ends*. Do you have an idea how to expand the box sooner or would you use a different approach? Sorry for longer MWE (attached also). Thank you, Jano \def\StartBox{\setbox0=\hbox\bgroup% open hbox \framed[frame=on]\bgroup% open framed \vbox\bgroup% open vbox (\par needed) } \def\StopBox{\egroup\egroup\egroup% close vbox, framed, hbox \setvariable{Test}{Height}{\the\ht0}% }% \startluacode ctx = context function TestBox() ctx("TeX Box: ") ctx.copy(false,0)ctx.par() ctx("TeX Getvar: ") ctx.getvariable("Test", "Height")ctx.par() var = tokens.getters.macro(tokens.getters.macro("??variables") .. "Test:Height") ctx("Lua Type: ") ctx(type(var))ctx.par() ctx("Lua Value: ") ctx(var)ctx.par() end \stopluacode \starttext \startluacode ctx.bold("First luacode (more boxes)")ctx.par() ctx.StartBox() ctx("AAA")ctx.par() ctx("BBB")ctx.par() ctx.StopBox() TestBox() ctx.StartBox() ctx("CCC")ctx.par() ctx.StopBox() TestBox() \stopluacode \blank[4*big] \startluacode ctx.bold("Second luacode (last content of box0)")ctx.par() TestBox() \stopluacode \stoptext

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Problem with gnuplot-module in lmtx
by Christian Prim 27 Nov '20

27 Nov '20

Hi with the latest version of lmtx (upgraded a minute ago), the gnuplot-example from the wiki-page (for lmtx with externalfigure) doesn't work. Error is: tex error > tex error on line 1 in file virtual://buffer.svg-sin-inclusion.1: Undefined control sequence <macro> \font_basics_predefine #1#2->\font_basics_defined_font_yes [#2]\gletcsname #1\expandafter \endcsname \csname \v_font_identifier_basic \endcsname <macro> \predefinedfont [#1]->\ifcsname \??predefinedfont #1\endcsname \lastnamedcs \else \font_basics_predefined {#1} \fi <macro> \svgnormal ...ame \??svgfamily #1\endcsname \lastnamedcs \else #1\fi -#2-#3}\predefinedfont [\s!spec :\p_font *\s!default \space @ 10bp] \fi #4\egroup <lua output> \svgstartlayer \svgscaled{1}{arial}{normal}{normal}{\svgscaled{1}{arial}{normal}{normal}{\svghashed{1}}} \svgstoplayer <lua output> \ <local> \global \setbox \mptextbox \hbox {\clf_mptexttoks } ... <line 6.1> \includegnuplotsvgfile[./sin.svg] \resetbuffer[svg-sin-inclusion] <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 here is the code: gnuplot.tex: \usemodule[gnuplot] \starttext \externalfigure[sin.gp][conversion=svg,width=4cm] \stoptext sin.gp: set format xy "$%g$" set title 'This is a plot of $y=\\sin(x)$' set xlabel 'This is the $x$ axis' set ylabel 'This is the $y$ axis' plot [0:6.28] [0:1] sin(x) The same code works on older lmtx (current version: 2020.09.20 23:02). It's not on the same linux-machine, but both have the same gnuplot-version installed. Is this a bug? Thanks Christian

1 1

Units of xpart and ypart of a pair in MetaFun
by Keith McKay 27 Nov '20

27 Nov '20

Hi, I have been using xpart and ypart to extract these values from pairs of points in a path but I wasn't getting the correct result. I was expecting: pair (2cm, 11cm) to give xpart 2 and ypart 11 However I was getting: pair (2cm, 11cm) -> xpart 56.6929 and ypart 311.8096 After much head scratching and reading the MetaPost and MetaFun manuals, I realised that the units of xpart or ypart are in Postcript points or Big Points (bp), and 1 bp is 1/72 of an inch, and thus to get the values of xpart or ypart in cm I would have to use a correction factor. I had made the assumption that since the x and ypart in the pair was in cm that the result would be in cm, but I see now that this is not the case. Will I have to continue doing this or is there some magic within MetaFun which takes account of the units in a pair and outputs the result of x and ypart in the same units? The MWE belows shows what I have been doing. Thanks Keith McKay %%% MWE %%% \setuppapersize [A5, landscape][A4, portrait] \usecolors[crayola] \starttext \startMPpage StartPage; width := PaperWidth ; height := PaperHeight ; unit := cm ; numeric squig; pair a[]; a0 = (2cm,11cm); a1 = (4cm,10cm); a2 = (6cm,9cm); a3 = (8cm,8cm); show xpart a[0], ypart a[0]; %Example of result from x and ypart before applying correction factor (cf) % cf := 72/2.54; %Converts points/in to points/cm% path pp; for i = 0 step 1 until 3: pp := ((xpart a[i])/cf*cm, (ypart a[i])/cf*cm); for squig = 1 step 1 until 15: xcoord := uniformdeviate(1) - 0.5 + (xpart a[i]/cf); ycoord := uniformdeviate(1) - 0.5+ (ypart a[i]/cf); pp := pp .. {curl 100}(xcoord*cm, ycoord*cm); endfor; pp := pp --- cycle; if i < 3 : pp := pp --- ((xpart a[i+1]/cf)*cm, (ypart a[i+1])/cf*cm); fi; f :=((1.4 - 0.6) * uniformdeviate(1)) + 0.8; % Factor to lighten/darken colour % draw pp withpen pencircle xscaled 0.5mm yscaled .1mm rotated 45 withcolor (f[white,\MPcolor{BurntSienna}]); endfor; StopPage; \stopMPpage \stoptext %%%%%%%%%%%%%%

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Testing for LMTX
by Jean-Philippe Rey 27 Nov '20

27 Nov '20

Dear list, I would like to determine if LMTX is being used. Mimicking system modes I tried \startmode[*lmtx] . . . \stopmode however, LMTX doesn't define this mode but apparently defines *mkiv. Do you know a way to distinguish between LMTX and MkIV ? Thank you, -- Jean-Philippe Rey jean-philippe.rey(a)centralesupelec.fr 91192 Gif-sur-Yvette Cedex - France Empreinte PGP : 807A 5B2C 69E4 D4B5 783A 428A 1B5E E83E 261B BF51

3 3

question about frames
by Pablo Rodriguez 26 Nov '20

26 Nov '20

Dear list, here is a minimal sample of frames to make up labels: \setuplayout[page] \starttext \dorecurse{16}{\dontleavehmode\dorecurse{4} {\framed[width=52.5mm, height=18.5mm, align=right]{\null}}\\} \stoptext Which is the way to avoid any vertical space between frames? Sorry, this may be obvious, but I don’t know how to do it now. Many thanks for your help, Pablo -- http://www.ousia.tk

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ntg-context November 2020