Math in metapost

Math in metapost

[Hans van der Meer]

I would like to put some math in metapost pictures. For the moment I am using textext for the typesetting in my metapost macro: pic := textext("\setbox0=\hbox{\color["&textcolor&"]"&labeltext&"}\dp0=0pt\box0");
picture pic will be placed in the metapost figure.

Simple math like $p=2$ works fine, but the system chokes on something like the following matrix:
$\pmatrix{p_{0|0}\cr}$ (it does fine in ConTeXt itself).

The error is: ! Only one # is allowed per tab.
system > tex > error on line 6 in file Info/kanaalmatrix.tex: Only one # is allowed per tab ...

Perhaps I am too optimistic about textext's possibilities. But how can I accomplish the placement of these and more elaborate formulae in metapost pictures using ConTeXt? It is of the essence for a series of Powerpoint slides I am preparing, wheein these formulae must be placed as individual pictures.

Hans van der Meer



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Re: Math in metapost

[Otared Kavian]

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Hi,

I am not a specialist, but I use the « btex etex » commands, such as
	dotlabel.bot (btex \switchtobodyfont[10pt] \strut $R$ etex, z1)

I just tested with the latest beta, and everything works fine, but not the \pmatrix construct (I tried also with ${k}\choose{n}$, which works fine too. 
I put my test file in which some maths is used in a MetaPost graphic here:
	http://dl.dropbox.com/u/4316076/test-graphique.tex

	http://dl.dropbox.com/u/4316076/test-graphique.pdf


Best regards: OK

On 30 nov. 2011, at 20:59, Hans van der Meer wrote:

> I would like to put some math in metapost pictures. For the moment I am using textext for the typesetting in my metapost macro: pic := textext("\setbox0=\hbox{\color["&textcolor&"]"&labeltext&"}\dp0=0pt\box0");
> picture pic will be placed in the metapost figure.
> 
> Simple math like $p=2$ works fine, but the system chokes on something like the following matrix:
> $\pmatrix{p_{0|0}\cr}$ (it does fine in ConTeXt itself).
> 
> The error is: ! Only one # is allowed per tab.
> system > tex > error on line 6 in file Info/kanaalmatrix.tex: Only one # is allowed per tab ...
> 
> Perhaps I am too optimistic about textext's possibilities. But how can I accomplish the placement of these and more elaborate formulae in metapost pictures using ConTeXt? It is of the essence for a series of Powerpoint slides I am preparing, wheein these formulae must be placed as individual pictures.
> 
> Hans van der Meer
> 
> 
> 
> ___________________________________________________________________________________
> 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://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

%%%%%%%%%%%%%%%%%%
Otared Kavian
Département de Mathématiques
Université de Versailles Saint-Quentin
Bâtiment Fermat
45 avenue des Etats Unis
78035 Versailles cedex

Téléphone: +33 1 39 25 46 42
Secrétariat: +33 1 39 25 46 44 
Secrétariat: +33 1 39 25 46 46

e-mail: Otared.Kavian@math.uvsq.fr





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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
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Math in metapost

[Hans Hagen]

On 30-11-2011 20:59, Hans van der Meer wrote:
> I would like to put some math in metapost pictures. For the moment I am using textext for the typesetting in my metapost macro: pic := textext("\setbox0=\hbox{\color["&textcolor&"]"&labeltext&"}\dp0=0pt\box0");
> picture pic will be placed in the metapost figure.
>
> Simple math like $p=2$ works fine, but the system chokes on something like the following matrix:
> $\pmatrix{p_{0|0}\cr}$ (it does fine in ConTeXt itself).
>
> The error is: ! Only one # is allowed per tab.
> system>  tex>  error on line 6 in file Info/kanaalmatrix.tex: Only one # is allowed per tab ...
>
> Perhaps I am too optimistic about textext's possibilities. But how can I accomplish the placement of these and more elaborate formulae in metapost pictures using ConTeXt? It is of the essence for a series of Powerpoint slides I am preparing, wheein these formulae must be placed as individual pictures.

you can patch pmatrix:

\unexpanded\def\pmatrix#1%
   {\left(\matrix{#1}\right)}

(i'll make the lot unexpandable)

btw, for large chunks you can consider using setups

\startsetups lots-of-math

\stopsetups

... \textext("\setup[lots-of-math]")




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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  : http://foundry.supelec.fr/projects/contextrev/
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