Re: Context and metapost: using \frac

[Andreas Harder <aharder@uni-koblenz.de>]

Am 26.04.2011 um 13:36 schrieb Matthieu Stigler:

> 
> Le 26/04/2011 12:36, Hans Hagen a écrit :
>> On 26-4-2011 12:02, Matthieu Stigler wrote:
>>> Dear Hans
>>> 
>>> Thanks for your quick answer! I was however not able to produce the
>>> graph with the textext code... Should I actually then use another
>>> compiler? I tried with context and texexec (I thought texexec is the
>>> compiler for mkiv, right? I'm on linux ubuntu).
>> 
>> no, use the 'context' command as texexec is for mkii
>> 
> ok, so I was using the right compiler.... I get a mystake while trying to compile a file with the code you sent... you didn't? Would you be so nice and send complete file, so I can check what is wrong?
> 
> 
>>> I saw also that, as you mention, context has a \frac:
>>> http://wiki.contextgarden.net/Math_with_newmat
>> 
>> indeed, \frac is already there for a long time (ams compatible command)
> 
>> btw, in mkiv there is no m-newmath
>> 
>>> I tried then to simply add \usemodule[newmat] and compile with context,
>>> but did not work... Code below, error message below below...
>>> ! Math error: parameter \Umathfraction_del_size\displaystyle is not set.
>>> l.3 ...t{411}{$\displaystyle \frac {\sigma _t}{a}$
>>> }
>>> <inserted text> ...ore.mp ; fi ; ;;;]===], false)}
>> 
>> make sure that a font is loaded that has math before \starttext is seen
>> 
>> (try with \setupbodyfont[palatino] at the top of your file)
>> 
> this does not work neither.... I still get error message with this code:
> 
> \usemodule[newmat]
> 
> \setupbodyfont[palatino]
> 
> \starttext
> 
> \startMPpage
> 
> label.top(textext("$ \frac{\sigma_t}{a}$") scaled 1.00, (1, 1));
> 
> %label.top(btex $ \frac{\sigma_t}{a}$ etex, (0, 10));
> 
> %label.top(textext( $\displaystyle \frac{\sigma_t}{a}$ ) scaled   1.00, (1, 1));
> 
> \stopMPpage
> 
> \stoptext

Hi,

this works for me.

\setupbodyfont[palatino]

\startMPpage[offset=1ex]
  u := cm ;
  label.top(textext("$ \frac{\sigma_t}{a}$") scaled 2,  origin);
  label.top(textext("$ \frac{\sigma_t}{a}$"),           (u,u));
  label.top(textext("$\dfrac{\sigma_t}{a}$") scaled .5, (u,0));
\stopMPpage

Greeting
	Andreas
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