how understand my variable is vacuum in use of \ifx?

Question

I want use \ifx and do some thing if my variable\myvariableis vacuum . how do it?

score 1 · Answer 1 · answered May 11 '15 at 19:14

1

\def\tmp{vacuum}
\ifx\myvariable\tmp yes\else no\fi

answered May 11 '15 at 19:14

David Carlisle

I think you don't understand my idea. vacuum means that my variable don't have any input:\newcommand{\myvariable}{} – Mojtaba Mansouri May 11 '15 at 19:18
2

@MojtabaMansouri It was unlikely that anyone guessed that:-) well exactly the same just define \tmp as {} – David Carlisle May 11 '15 at 19:30
thank you.the reason that i don't understand was i use {} in your code but don't work for me. i use \newcommand{\tmp}{} and it work – Mojtaba Mansouri May 11 '15 at 19:36
@MojtabaMansouri ah OK, yes (or \long\def\tmp{}) – David Carlisle May 11 '15 at 20:17

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