Value of Metapost variable as a label

Value of Metapost variable as a label

[Curiouslearn]

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Hello,

First of all, Mojca thanks very much for the update about TikZ. (I could not
find an option to reply in Context Garden mailing list).

My new question is the following. I have the following code to generate the
labels for the tick marks:

for i = 0 step 5 until 45:
                draw (i,0)*u -- (i,-0.2)*u;
                label.bot(decimal(i) ,(i,-0.2)*u);
endfor;

As you can see I use "decimal(i)" to get the labels (0,5,10,... and so on).
But the font of these numbers is not the same as when I use the "btex
label_text etex" command, which I have set to palatino. How can I typeset
the value of Metapost variables (such as "i" in this case), using tex
commands. For example, if I had to typeset (n_{1},n{2},...,n_{100}), how
could I do that.

On page 63 of John Hobby's metapost manual, he talks about how this could be
achieved using TEX.mp. I tried typing \input TEX before \starttext, however,
I get the error "I can't find file `TEX;' If I put it within the
\startuseMPgraphic  and \stopuseMPgraphic, it still does not work. Do I have
to download this from somewhere or does Context have another solution?

Thanks very much.

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Re: Value of Metapost variable as a label

[Aditya Mahajan]

On Sat, 21 Mar 2009, Curiouslearn wrote:

> Hello,
>
> First of all, Mojca thanks very much for the update about TikZ. (I could not
> find an option to reply in Context Garden mailing list).
>
> My new question is the following. I have the following code to generate the
> labels for the tick marks:
>
> for i = 0 step 5 until 45:
>                draw (i,0)*u -- (i,-0.2)*u;
>                label.bot(decimal(i) ,(i,-0.2)*u);
> endfor;
>
> As you can see I use "decimal(i)" to get the labels (0,5,10,... and so on).
> But the font of these numbers is not the same as when I use the "btex
> label_text etex" command, which I have set to palatino. How can I typeset
> the value of Metapost variables (such as "i" in this case), using tex
> commands.

label.bot (textext(decimal(i)), (...)) ;

> For example, if I had to typeset (n_{1},n{2},...,n_{100}), how
> could I do that.

label.bot (textext("$n_{" & decimal i & "}"), ... ) ;

etc.

> On page 63 of John Hobby's metapost manual, he talks about how this could be
> achieved using TEX.mp. I tried typing \input TEX before \starttext, however,
> I get the error "I can't find file `TEX;' If I put it within the
> \startuseMPgraphic  and \stopuseMPgraphic, it still does not work. Do I have
> to download this from somewhere or does Context have another solution?

Use textext.

Aditya
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Re: Value of Metapost variable as a label

[Curious Learn]

Aditya Mahajan <adityam <at> umich.edu> writes:

 
> > For example, if I had to typeset (n_{1},n{2},...,n_{100}), how
> > could I do that.
> 
> label.bot (textext("$n_{" & decimal i & "}"), ... ) ;


Thanks Aditya. That works great.


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Re: Value of Metapost variable as a label

[Eythan Weg]

Curious Learn <curiouslearn@gmail.com>
Sat, 21 Mar 2009 22:40:46 +0000 (UTC)

   Aditya Mahajan <adityam <at> umich.edu> writes:
   
    
   > > For example, if I had to typeset (n_{1},n{2},...,n_{100}), how
   > > could I do that.
   > 
   > label.bot (textext("$n_{" & decimal i & "}"), ... ) ;

This however fails:
k:=2; 
label.bot(textext("$1\over" & decimal k & "$"), (10,0)) ; 

with this error:

6401a0e1a39f3ee04c60209dc5/formats/cont-en-metafun.mem
! Use of \dospecialabout doesn't match its definition.
l.1 \MPLIBsettext{415}{$1\dospecialabout 2
                                          $}
\processMPgraphic ...e \MPuserinclusions ;\!!es )}
                                                  \global \settrue \METAFUNi...

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___________________________________________________________________________________

Re: Value of Metapost variable as a label

[Mojca Miklavec]

> This however fails:
> k:=2;
> label.bot(textext("$1\over" & decimal k & "$"), (10,0)) ;

Try with \frac instead.

Mojca
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Re: Value of Metapost variable as a label

[Aditya Mahajan]

On Mon, 23 Mar 2009, Mojca Miklavec wrote:

>> This however fails:
>> k:=2;
>> label.bot(textext("$1\over" & decimal k & "$"), (10,0)) ;
>
> Try with \frac instead.

Or prevent expansion of \over

label.bot(textext("$1\noexpand\over" & decimal k & "$"), (10,0)) ;


Aditya
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Re: Value of Metapost variable as a label

[Eythan Weg]

Aditya Mahajan <adityam@umich.edu>
Sun, 22 Mar 2009 22:24:17 -0400 (EDT)

   On Mon, 23 Mar 2009, Mojca Miklavec wrote:
   
   >> This however fails:
   >> k:=2;
   >> label.bot(textext("$1\over" & decimal k & "$"), (10,0)) ;
   >
   > Try with \frac instead.
   
   Or prevent expansion of \over
   
   label.bot(textext("$1\noexpand\over" & decimal k & "$"), (10,0)) ;

Why \atop or \choose do not need \noexpand?
What is special about \over?   
   
   Aditya


Thanks,

Eythan 

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Re: Value of Metapost variable as a label

[Aditya Mahajan]

On Mon, 23 Mar 2009, Eythan Weg wrote:

>
> Aditya Mahajan <adityam@umich.edu>
> Sun, 22 Mar 2009 22:24:17 -0400 (EDT)
>
>   On Mon, 23 Mar 2009, Mojca Miklavec wrote:
>
>   >> This however fails:
>   >> k:=2;
>   >> label.bot(textext("$1\over" & decimal k & "$"), (10,0)) ;
>   >
>   > Try with \frac instead.
>
>   Or prevent expansion of \over
>
>   label.bot(textext("$1\noexpand\over" & decimal k & "$"), (10,0)) ;
>
> Why \atop or \choose do not need \noexpand?
> What is special about \over?

It is redefined by ConTeXt to be a useful command in text mode.

\starttext

\section[sec:test] {Some section}

See \over[sec:test]

\stoptext

Hans, is it OK to change the definitions in core-def to

\ifnum\texengine=\luatexengine
     \ifx\in   \undefined\else \let\normalmathin   \in 
\unexpanded\def\in   {\mathortext\normalmathin   \dospecialin   } \fi
     \ifx\at   \undefined\else \let\normalmathat   \at 
\unexpanded\def\at   {\mathortext\normalmathat   \dospecialat   } \fi
     \ifx\about\undefined\else \let\normalmathabout\about 
\unexpanded\def\about{\mathortext\normalmathabout\dospecialabout} \fi
     \ifx\from \undefined\else \let\normalmathfrom \from 
\unexpanded\def\from {\mathortext\normalmathfrom \dospecialfrom } \fi
     \ifx\over \undefined\else \let\normalmathover \over 
\unexpanded\def\over {\mathortext\normalmathover \dospecialabout} \fi
\fi


(added \unexpanded). This is certainly useful for \in and \over, maybe not 
so much for the other three.

Aditya
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