[texhax] conditional macros

[Barry Dale]

Of course...
  Thanks :-)

-- 
Barry Dale
Technical Writer
M-Tech Information Technology Inc.
http://mtechIT.com http://psynch.com http://idsynch.com
--------------------------------------------

On Thu, 29 Apr 2004, Ross Moore wrote:

>
> On 29/04/2004, at 10:27 AM, Barry Dale wrote:
>
> > I seem to recall a discussion on this list recently about printing
> > terms in text in bold the first time they are used in a document, then
> > in normal font after that. I think the solution involved ifthen
> > commands.
> >
> > I have a similar situation. I use macros to insert boilerplate
> > responses to submitted questionaires. The macros can include graphics,
> > and can be used more than once. I would like the graphics to be
> > used only once (to save space and avoid multiple labels).
> >
> > Is there a way to check if a macro has already been used, and
> > treat it differently on subsequent uses?
>
> Yes, this is easy to do.
> Just make the macro redefine itself after the first usage.
>
> >
> > In other words, the macro  \AnswerOne may be defined as:
> >   \AnswerOne{%
> >     text
> >     text
> >     \FigureOne{}
> >     }%
> >
> > so that \FigureOne is expanded the first time but empty on subsequent
> > uses.
>
> e.g.
>    \newcommand{\FigureOne}{... whatever you want ....
>      \renewcommand{\FigureOne}{}}
>
> >
> > I'm familiar with basic LaTeX, but I'm not a programmer, so the
> > ifthen documentation is a little daunting. Sorry if it seems obvious.
>
>
> Easy, but not completely obvious.  :-)
>
> Hope this helps,
>
> 	Ross Moore
>
>
> >
> > Many thanks
> >
> > --
> > Barry Dale
> > Technical Writer
> > M-Tech Information Technology Inc.
> > http://mtechIT.com http://psynch.com http://idsynch.com
> > --------------------------------------------
> >
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> ------------------------------------------------------------------------
> Ross Moore                                         ross at maths.mq.edu.au
> Mathematics Department                             office: E7A-419
> Macquarie University                               tel: +61 +2 9850 8955
> Sydney, Australia                                  fax: +61 +2 9850 8114
> ------------------------------------------------------------------------
>