{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}.
10
votes
4answers
663 views
How to make a “condition” in a macro?
I would like to make a macro with two parameters which return a text. For instance, I want \M{1}{5} to return [1,5], and \M{2}{2} to return [2] (because the two arguments are the same). So I need to ...
10
votes
2answers
514 views
Doing something only when the draft option is on?
I would like to do some stuff that is only enabled when the draft option is given in \documentclass[draft]{article}.
How would I go about doing this?
9
votes
1answer
2k views
Comparing an argument to a string when argument is a result of a command with etoolbox
I've got an example like that:
\documentclass{article}
\usepackage{etoolbox}
\newcommand{\ab}{a}
\newcommand{\aORb}[1]{%
\ifstrequal{#1}{a}{"a" was given}{not a}, %
...
7
votes
2answers
344 views
biblatex: is there a command analogous to \ifciteseen but within one page?
Biblatex is loaded as
\usepackage[style=numeric-comp,hyperref=true]{biblatex}
\ExecuteBibliographyOptions{citetracker=true,sorting=none,firstinits=true}
I am looking for an if-command, which would ...
6
votes
4answers
186 views
How to detect and condition based on hostname
How do I construct a conditional statement based on the hostname of the compiling computer in LaTeX? For example:
\ifhostname{mymachine}
\dostuff
\else
\dootherstuff
\fi
Why: I am working with ...
6
votes
1answer
1k views
Using ifthenelse in pgfmath
Following questions on constructing functions on the forum, I tried to build some myself. I can't seem to get the ifthenelse function in TikZ/PGF to work. Here is an example:
...
6
votes
1answer
567 views
Conditional compilation of beamer slides
I'm preparing a beamer slideshow, and I will have to print slides.
I would rather use landscape mode slides, but it is possible that I need to use portrait mode ones. Sadly, I won't know until a few ...
4
votes
2answers
292 views
How to configure theorems depending on the document class?
I would like to have \newtheorem{teo}{Teorema}[chapter] if the book class is loaded but \newtheorem{teo}{Teorema}[section] if the article class is loaded. Can I do this with some sort of ...
15
votes
3answers
300 views
What's the use of the @compatibility condition?
All of the standard LaTeX document classes (article, book and report) declare some basic functionality and parameters based on the condition @compatibility. Here's an extract from from article.cls ...
13
votes
4answers
1k views
Proper way to detect empty/blank text
I am attempting to ignore a command if it is passed with empty/blank text. My use case is not as complicated as one Expand away empty macros within ifthenelse where @egreg provides what seems like a ...
9
votes
3answers
446 views
How to implement a command that checks for loaded packages?
I use the following code to check if a package is loaded:
\RequirePackage{ltxcmds}
\newcommand{\IfPackageLoaded}[2]{\ltx@ifpackageloaded{#1}{#2}{}}
However, sometimes I want to check if more than ...
8
votes
5answers
322 views
Teach me how to use \loop…\repeat constructs, etc
The following code snippet is a part of the solution given here:
\def\IncludeOutput#1{
\parskip=2mm
\def\examplename{#1}
\pdfximage{\Directory/\examplename.pdf}%
...
8
votes
2answers
234 views
How to check if a column type is defined?
Column types for tables can be defined and overwritten with \newcolumntype.
I would like to know if a column type is already defined for an example which shall only be executed in the case where the ...
8
votes
2answers
176 views
Is it possible to abort loading a package if it's too old?
I'm working on a package that has to work on both TeXlive 2009 (Ubuntu, so updating TeXlive is a nonstarter) and later versions, and I'd like to be able to use fontspec with LuaLaTeX if we're on ...
8
votes
1answer
273 views
How do I make make different versions of my document with command line compile flags?
I've found a number of answers online, and plainly none of them have seemed to be able to execute any conditional code. This answer looked particularly promising.
One thing I noticed is that in the ...
6
votes
1answer
306 views
Can I test if a file exists? [duplicate]
Can I somehow test if a file exists? And can I use this to do only things when it exists? I like to do something like
if(exist('members.csv')) {
do something
}
6
votes
2answers
135 views
Is “conditionals” name of package?
In some package I have seen construct like this one:
\if\blank{\myMacro}%
%do something
\else
%do something else
\fi
I like it and I want to use it to test if call to a macro has empty result. ...
6
votes
1answer
755 views
How to tell if the current section is defined in Beamer?
I am customising the footer of my Beamer slides. The footer displays the title of the slides, followed by a ":", and then the current section title. This works fine if the current section is defined. ...
5
votes
1answer
204 views
Suppressing remarks when not needed
I have written some remarks in some of my works that are somewhat informal and repetitive in nature (mainly for my own clarification). I was wondering if there is a way of suppressing them when I ...
4
votes
2answers
89 views
How to test if a given reference belongs to a list of labels?
This question is a prolongation of my previous question How to choose from a list for using result in \ref?. I got really good and interesting answers. Unfortunately I can not implement them for my ...
1
vote
2answers
225 views
How to multiply compile according to selected tags?
I would like to do the following, by I am not sure how.
Say I have a LaTeX file with series of annotations, each with zero or more "tags" (say, about their contents or the project they are related ...
21
votes
5answers
341 views
Test if a given control sequence is a length register
I'm in need of a macro which receives a control sequence as argument and needs to branch if this macro is actually a length (of any kind, e.g. dimen, skip etc.) or "just" a normal macro (including one ...
16
votes
5answers
419 views
Applying an operation only to capitals
I'd like to apply a function to capitals only so that:
\emphcaps{YaWeH}
Outputs like:
\emph{Y}a\emph{W}e\emph{H}
Preferably without using too many packages (I already use memoir).
NOTES: I use ...
14
votes
1answer
510 views
Conditional pagebreak?
Is there a way I can have LaTeX insert a pagebreak, if the last line of the page is a certain string? e.g.
\noindent \textsl{Solution}:
thanks very much!
12
votes
1answer
166 views
Formatting floats differently based on placement
I'm interested in changing how floats are formatted depending on whether they are placed at the top, bottom, or middle of a page, or on a float page. One package I am aware of that does something like ...
21
votes
4answers
1k views
Test success of write18
For the new version of my package and class standalone I like to call external programs: further (pdf)latex runs to optionally compile included standalone files, and to convert the resulting PDF to ...
15
votes
1answer
145 views
First occurrence of a command
I'm writing some macros that need to behave differently after first occurrence. I decided to use the etoolbox package's toggle. My MWE is as follows:
\documentclass{article}
\usepackage{etoolbox}
...
14
votes
2answers
174 views
Is there a way to determine if there is a float on a page?
I am busy developing some code to draw layouts. Part of the code overlays the layout as shown in the images below:
The black arrows to the side of the images, denote the \topfraction and ...
25
votes
4answers
1k views
Alternate he / she in text
This question led to a new package:
he-she
I have seen a book that instead of using the masculine pronoun (he, his, etc.) alternates the gender ('he' then 'she' then next time 'he' again).
Is ...
18
votes
4answers
588 views
On testing two fully expanded character strings for equality
I know three macros that test two fully expanded character strings for equality:
\ifthenelse{\equal{<op1>}{<op2>}}{<true>}{<false>} (ifthen package)
...
14
votes
3answers
519 views
Redefine command when inside a specific other command possible?
How, in general, can I (re)define commands based on in which other command they are nested?
A more specific example: I have a custom latex command (say, \code{}) that makes text appear bold. ...
12
votes
1answer
70 views
Simple way to switch inline asymptote figures on and off
I use the inline asymptote environment \begin{asy} to draw a lot of the figures in my papers. To those not familiar with asymptote, the asymptote package creates *.asy files for each of the asy ...
12
votes
2answers
640 views
Custom quotation style which depends on length of quotation
I am writing my PhD-thesis and I need to meet certain formatting requirements in regard to quotations. I know there is the quote environment. But in this conditions it doesn't match my universities ...
10
votes
2answers
161 views
How to detect if option provided via \tikzset
I would like to be able to detect if a particular option has been provided via a \tikzset and issue a message based on that.
The MWE yields:
But once the conditional works (just a comment for ...
7
votes
1answer
4k views
Conditionally hidden slides in beamer
When creating a presentation, I sometimes create extra slides that contain additional information, a more thorough explanation, or an extra plot pertaining to certain parts of my talk. These extra ...
7
votes
3answers
929 views
Hide custom environment content based on boolean
I have a custom environment which adds some text around its content, but I also want it to be able to show or hide its contents depending on a boolean.
I have tried doing the following:
...
4
votes
3answers
349 views
Create odd-numbered answers, or all answers
I'm starting with a clean slate creating a solutions manual. I would like the ability, by setting a switch, to produce only the solutions for the odd-numbered problems, or those for all problems, in ...
19
votes
6answers
2k views
What is \iffalse for?
So this is something I've wondered about for a while. What use is a conditional that always evaluates to false? I guess it's a neat way to "hide code from LaTeX" but apart from that, is it ever ...
16
votes
4answers
521 views
Is this branching code I wrote a bit obfuscated?
I've been away for a while and I forget if this sort of question is appropriate, but here goes. Recently I wrote some code (in expl3 but I hope it's clear enough) and in hindsight I wonder on its ...
13
votes
3answers
333 views
Making a “For Loop”
I am trying to make a "for loop" that will iterate the variable reaches 1.
However, none of the "for loops" I have found in the Internet works.
These files will be distributed to other people and ...
12
votes
3answers
361 views
Detect which text “mode” (normal, italic, bold, etc.) is currently in use?
In my document, I'm often setting upper case words and abbreviations in small caps because it avoids breaking the flow (which upper case words does). Also, many words (like CUDA, for instance) are ...
10
votes
2answers
491 views
Automatically remove page number if document has only one page (but not if two)
I write a lot of documents (agreements) based on memoir with the article option. Normal pagestyleis plain (page number centered in the footer). Sometimes a document is only one page long, and a page ...
9
votes
2answers
149 views
Is a TeX macro defined?
I am looking for a way in TeX to check if a macro was defined.
Currently I use a rather tangled way. I exploit a sort of side effect when comparing two macros via \ifx; this command returns:
true, ...
9
votes
1answer
218 views
Macros for hiding empty sections do not work properly
In an attempt to make it possible to outline much of my document by adding new parts to it, but without making parts that I have not written anything on show up in the compiled document, I have ...
9
votes
1answer
226 views
What documentation thoroughly explains how to use TeX conditionals?
I have a document which needs a large variety of plain TeX conditionals, e.g.:
IF #1 >= 1 AND #2 >= 10
IF #1 != “tree” OR #2 == “mountain”
IF 10 > #1 > 2
I have found limited ...
9
votes
1answer
292 views
Hiding section titles when the section is empty
I have created a macro like this:
\newcommand{\showsection}[2]{
\ifstrequal{#2}{}{}{\section{#1} #2}
}
It should be used like this in the document:
\showsection{Books}{
Do you know any ...
8
votes
1answer
344 views
How do I configure fonts and package options for different engines?
I would like to be able to rely on the code in my document class to respond correctly to whether it is being rendered using pdfLaTeX or XeTeX engines. The editor I'm using (LyX) does this using ...
8
votes
3answers
2k views
How to make LaTeX ignore the contents of an environment?
I would like to make a \todo command and environment whose behavior changes depending whether I define a command \showtodos. A basic \todo command is simple to write:
...
8
votes
3answers
211 views
Including only the parts of a document corresponding to a conditional expression
Suppose I have a LaTeX document, which uses a conditional. Ie.
\ifdefined\submit
[....]
\else
[....]
\fi
So, if we have, say, defined
\def\submit{}
then the first part of the conditional ...
7
votes
1answer
281 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.)
