Hello Jean,
Jean-Pierre Coulon wrote on Fri, 18 Jul 2014 21:17:55 +0200:
> I have made macros containing a spacing command and an accidental. I want
> to make *two* versions of my score. One with both commands active, the
> other with both inactive. Therefore I'va made macros with \ifx.
>
> But why are the beam starts displaced with my definitions using \ifx?
> Please try the simple and complicated definitions in the attached file.
>
> Bye,
>
> Jean-Pierre Coulon
try this:
% complicated defintions:
\def\mysk{\ifx\urtext\undefined\off{.8\elemskip}\fi}
\def\mysksh#1{\ifx\urtext\undefined\off{.8\elemskip}\sh{#1}\fi}
\def\myskna#1{\ifx\urtext\undefined\off{.8\elemskip}\na{#1}\fi}
I am not good at explaining the logic theory inside TeX engine.
I would like to suggest you to read `TeX by Topic' written by
Victor Eijkhout:
10.4.2 The brace as a token.
Chapter 11 Macro
Chapter 13 Conditionals
Online version is available at CTAN.
----
Hiroaki MORIMOTO <[email protected]>
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