How to create an empty macro?

[Richard Kimberly Heck]

On 5/12/25 11:28 AM, Jean-Marc Lasgouttes wrote:
> Le 12/05/2025 à 16:57, Richard Kimberly Heck a écrit :
>> On 5/12/25 5:47 AM, Jean-Marc Lasgouttes wrote:
>>> Hi there,
>>>
>>> I tried to replace the example in section 6.9 Branches of the user's 
>>> guide by proper math macros, because the example as it is breaks 
>>> previews.
>>>
>>> So I would like to define
>>> \newcommand[1]{\question}{#1}
>>> \newcommand[1]{\answer}{}
>>>
>>> However, I cannot construct a math macro that does not use its 
>>> parameter. The parameter is automatically removed. Is there a way 
>>> around this?
>>
>> Add the argument to the LyX box, and put \relax (or whatever) in the 
>> LaTeX box. Presumably, one wants some version of the content to show 
>> in LyX itself anyway.
>
> Not really a good example to put in a UserGuide, then. But indeed, it 
> would work.
>
> I have not found yet an example with macros that would make sense and 
> be simple enough. The current example is stupid _and_ breaks previews.

I'd just remove it. This is way too complicated for the User Guide anyway.

Riki