{conditionals} is about macros like \if and \ifx that may execute other macros depending on whether certain conditions are true or not. Popular packages are {etoolbox} and {ifthen}.

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36
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6answers
6k views

Is it possible to keep my translation together with original text?

I have an English article in LaTeX, which I'm going to translate to Russian. I want to keep my translation in sync with the original text. It means that I want every paragraph to stay as close to its ...
11
votes
2answers
270 views

What is “dimen” in the documentation for the ifthen package?

In the documentation for the ifthen package, there is a test called \lengthtest which compares two <dimen> parameters with the operators <, > or =. (For other test commands, <dimen> ...
21
votes
4answers
2k views

Detect beginning of a sentence in a macro for capitalization

Is it possible to make macros give different results at the beginning of a new sentence? Suppose that I want the macro "\secname" to write "Section" at the beginning of a new sentence, and "section" ...
11
votes
2answers
9k views

Tikz/Pgf if statements

I'm having trouble writing if statements, I can find next to no documentation on them and what I want to do seems quite simple. I'm using the orbitals pgf/tikz example from here, and I'd like to ...
4
votes
3answers
2k views

How to use \newcommand for \href?

I want to format Wikipedia entries in my document in a standard way: \href{http://en.wikipedia.org/wiki/Foo}{Foo} So I thought about using \newcommand*: \documentclass{article} \usepackage{ifthen} ...
6
votes
1answer
623 views

How to display some text based on a condition inside a tabular environment?

I defined a variable \@afwezig that holds people that were not present at a certain meeting. \long\def\@afwezig{} \def\afwezig#1{\def\@afwezig{#1}} Now I want to make the header of the meeting ...
14
votes
2answers
2k views

How do I conditionally execute something based on a documentclass option?

I'd like to conditionally do some things (like input a file) depending on if a specific class option was passed. For example, I'd like to have an "instructor" option to the class that would input a ...
29
votes
6answers
5k views

Test whether token list is empty

Is it possible to test whether a token list register is empty without expanding it?
2
votes
1answer
479 views

\newcommand that restricts the value of an argument

When defining a macro, is it possible to restrict the value of an argument, so that if the thing followed it is a number, then it takes it as an argument, but if it is not, then it is just empty. To ...
34
votes
4answers
11k views

How to conditionally define a new command in LaTeX?

I'm trying to compile a LaTeX code with an older version of some package. Thus, I'm having a few issues due to undefined commands. How can I add conditional code so that I can define some work-around ...
6
votes
1answer
965 views

Using versions environment tags inside a new environment definition

I just found out about the versions package here and am interested in using it to hide solutions in a problem set document. Recall that, to create versions block, in the preamble, you need ...
12
votes
1answer
663 views

Loading a package conditionally

Is it possible to load some package from a .sty file only if some option is selected? (Naive approach \DeclareOption{something}{\RequirePackage{something}} doesn't work.)
62
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6answers
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Which document class is being used?

Is there a way to programmatically determine which document class is in effect? I'd like to be able to write conditional macros that behave differently depending on which document class is currently ...