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.
Mojca
PS: I would say: better use \sometxt which is far more reliable unless
you have to use textext to do string manipulation.
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