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From: "Denis B. Roegel" <Denis.Roegel@loria.fr>
Newsgroups: gmane.comp.tex.context
Subject: Re: MetaPost question
Date: Sun, 18 Nov 2001 12:57:34 +0100
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On Sat, Nov 17, 2001 at 08:54:42PM +0100, Jose Luis Diaz wrote:
>  But  then  suppose  that  I also want a label below each dot, typeset
>  with  TeX,  which  reads:  $t_1=3$,  $t_2=20$,  $t_3=25$. I can't use
>  btex/etex  because I want to construct the text $t_1=3$ from the loop
>  variable, something like:
> 
>   for i=1 upto 3:
>     sprintf(string,"$f_%d=%d$",i,t[i]);  %This is not Metapost, obviusly
>     label.bot(TEX(string), (0u, t[i]*u)); % This is
>   endfor;
> 
> 
>   How can be done?

Build your string s with something like 

  s="$t_" & decimal(i) & "=" & decimal(t[i]) & "$";

and then write

  label.bot(TEX s,(0,t[i]*u))

and don't forget input TEX at the beginning of your file.

Denis