On Fri, 14 May 2010, Mojca Miklavec wrote:
On Thu, May 13, 2010 at 23:45, Marco <net...@lavabit.com> wrote:
On Thu, 13 May 2010 22:58:46 +0200, Hans Hagen <pra...@wxs.nl> wrote:
On 13-5-2010 9:18, Marco wrote:
> Hi,
>
> I have a problem producing an ampersand in metapost. In ConTeXt it
> works as expected. Have a look at the following example.
>
> \starttext
> \& % OK
> \startMPcode
> label(textext("\&"),origin); % produces error
> \stopMPcode
> \stoptext
>
> The compile time error message is as follows:
> ! Misplaced alignment tab character&.
> l.1 \MPLIBsettext{1}{&
\letterpercent
Doesn't work. I suppose you mean \letterampersand. If I change \& into
\letterampersand I get exactly the same error as \& produces (BTW:
\letterpercent also produces an error, but a different one).
So:
- label(textext("\letterbackslash\letterampersand"),origin);
- label(textext("\letterbackslash\&"),origin);
This is because the commands are interpreted with TeX before they are
written to mpgraph.mp. The \letterampersand or \& generates the
character & alone: you need to preceed it with backslash, so that
metapost finally knows what to do.
So, should all the \letter... commands (basically anything generated from
char-def.lua) be unexpandable?
You can also try \noexpand\letterampersand
Aditya
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