{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}.

learn more… | top users | synonyms (1)

17
votes
6answers
2k views

Checking if a number is a multiple of 4

Using etoolbox, ifthen, or another form of conditional checking, how can I check if a value is a multiple of 4? E.g. if the number is 4, 8, 12, 16, etc., then it returns "true".
14
votes
2answers
1k 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, ...
13
votes
4answers
503 views

How do you test whether a known key value has been set in pgfkeys

Using the .code handler to my keys and a private macro, I can easily test whether a key has been set when using pgfkeys. For example: \documentclass{article} \newcounter{mytestenvcounter} ...
13
votes
3answers
402 views

Gobbling an argument if it starts with #

My problem comes from pandoc and markdown, but it is not directly related with these tools, but instead with "customizing" the resulting pdf via some tex macro programming, so I think it is on topic. ...
12
votes
2answers
652 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 ...
6
votes
3answers
786 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 ...
14
votes
1answer
545 views

Create Two PDF versions of Classroom slides from Single LaTeX file: Teacher and Student

Is there a way to create a single document that will process a LaTeX file in two different ways (different preambles) and produce two different outputs. Specifically, I want to produce a set of ...
11
votes
1answer
328 views

Is there a macro telling which OS we're using?

I got some LaTeX documents that I have to compile them under different TeX Live, such as MacTeX or TeX Live. But in different OS, the font seems different too, for example, while in Windows, I prefer ...
9
votes
2answers
868 views

Expand command read from file

I have a file, that contains a list of latex commands each command per line. Now I want to read this file line per line and execute/expand the macros automatically. I tried the following but this only ...
9
votes
1answer
2k views

How to use mod operation in latex with tikz

I need something similar to \ifnum \j mod 2 = 0 rest of a number, but do not know how to do this in line 22. \documentclass{article} \usepackage{tikz} \usepackage[active,tightpage]{preview} ...
8
votes
2answers
436 views

Custom ToC — Put vspace only below chapters that have sections in them

I’m using the titletoc package in the book class. Currently, my chapter entries are configured like this (I left out the unimportant parameters for simplicity): \titlecontents{chapter}[0pc] ...
7
votes
2answers
236 views

How can I write a conditional coloring command that distinguishes variables within sectioning commands vs those within the body text?

Question Is it possible to write a conditional statement for commands that change them based on where they appear in the document? Example Situation When command appears in the body, it should be ...
7
votes
2answers
253 views

How to use the total page count in a conditional expression?

I would like to have different footer or page style depending on whether the document has one or more pages. I am not very experienced with TeX programming, so the answers about "Comparing an argument ...
5
votes
6answers
157 views

How to write macro with variable amount of text variables

I am trying to make a signature block macro that accepts a variable number of text variables so that I can add or subtract the text without using empty fields "{}" as arguments. ...
5
votes
1answer
845 views

TikZ calendar and conditional tests

I would like to specially mark national holidays in my calendar. Some of the rules are "First Monday in June" and "Last Monday in October". I have been looking at the example on p. 280 of the PGF ...
4
votes
3answers
277 views

Safe test for an empty expanded macro argument?

How can I test in a safe way (i.e. without reserving tokens as explained here) if an expanded macro argument is empty?
22
votes
2answers
516 views

Show footnotes on odd pages only

I'm writing my thesis using the scrbook-class. Is it possible to display footnotes only on the odd (right) pages? This should mean that \footnote{something} should be collected on even pages and ...
12
votes
4answers
2k 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 ...
11
votes
3answers
1k 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 ...
10
votes
1answer
292 views

querying whether a font feature has been activated via a fontspec command

A LaTeX package I'm currently writing makes use of -- and definitely requires -- some of the power of LuaLaTeX. I would like to make my package's user interface -- in particular, the options that need ...
9
votes
1answer
500 views

Testing lines read from external file

I am trying to read some data from an external file and perform specific actions based on the contents of a given line. Below is my attempt to test a read line using \ifx - it does not work. I've ...
9
votes
1answer
840 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
2k 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. ...
7
votes
1answer
842 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 ...
6
votes
2answers
164 views

Conditional code on page size

I've never done any coding in Latex than involves anything too complex (anything more than just writing and customizing a few stuff here and there), so I'm having troubles finding what I need to do ...
4
votes
2answers
111 views

Is is possible to conditionally switch languages within one document? [duplicate]

I'm quite new to biblatex. I'm typesetting a collection that has papers both in English and Russian, and I'm making a single bibliography at the end of the book. For the bibliography to look pretty, ...
4
votes
2answers
639 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 ...
3
votes
2answers
502 views

Beamer conditional pdf file generation

I would like to know if there is a method to generate beamer pdf presentation based on conditions. For example: -Main Beamer presentation: Slide 1 Slide 2 Slide 3 Slide 4 Slide 5 -For the first ...
13
votes
2answers
658 views

How to tell when to use pdflatex, latex, and xelatex for any given tex file?

I'm writing an automatic compiling pipeline that should be able to compile any given tex file into a pdf. The diversity of the input tex files mainly shows up in what format of figures they use and ...
12
votes
2answers
580 views

Missing Item number in enumerate

You would think that I would know better than to mess with an egreg solution, but in my defense I used a DavidCarlisle solution from \setbox vs. \sbox and \savebox - What are the differences I need to ...
11
votes
1answer
1k views

Conditional using non-integer numbers

I am trying to generate fractals using affine transformations. I need to generate a random number in the interval (0,1), and depending on the value of this random number choose a function to ...
10
votes
2answers
348 views

tikz, conditional setting of shape parameters

In my illustration I use simplified sketches of stopwatches (timers), which appear in three different "modes": (1) start of interval (coloured green), (2) time in progress (yellow), and time is ...
9
votes
3answers
359 views

Defining tabular rows with macros using `\ifnum` leads to `Incomplete \ifnum`

I am trying to define tabular rows using a macro which shall perform an conditional definition of the tabular row according to a given parameter. Please consider the following MWE: ...
8
votes
1answer
109 views

How to use \ref command in the test block of \ifnum?

Is there a way to use \ref{} inside the test part of \ifnum. The following example runs into an error. \documentclass{article} \begin{document} \begin{table} \caption{ex} \label{tab:ex} ...
7
votes
2answers
896 views

problem with \ifthenelse + multicolumn

I encounter various problems when i want to control the display of a table with a ifthenelse test. For example, consider the following M(non)WE : \documentclass{article} \usepackage{multirow} ...
6
votes
1answer
85 views

tabularx processes its body multiple times; how do I know which cycle I am in?

Assume that I enjoy setting my tables using an \itemized or list-like coding structure: \begin{mytabular}[.5\textwidth] \item head1 & head2% <-- header row \item abc & def \item ghi ...
6
votes
2answers
191 views

Enhanced fill-in-the-blank document

I am about to improve my lecture slides from last semester. Specifically, I would like to add a fill-in-the-blank option. I found this code suggestion (from here): \documentclass{article} ...
6
votes
2answers
183 views

Separators for author group (IF conditon)

I am new to LaTeX, just a beginner, basically a Perl developer. I have created a LaTeX file \begin{document} \cont{\iname{\isurname{Name1}\ifname{K. C. G.}}\iname{\isurname{Name11}\ifname{Y. ...
6
votes
2answers
156 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. ...
5
votes
1answer
344 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
1answer
35 views

Conditional input of a file depending on a keyword that its contains

I have several files containing each an exercise and to make a document I include a set of this files. Some of them need a special treatment so I need a to make a conditional input command that test a ...
4
votes
2answers
98 views

How to use conditional (if statements) with data from acronyms?

I am using acronym for autocomplete my text like mailing functions. So I want the long text from acronym using all the time, and I am using \acro{}{} to define, so \acro{Maria}{f} - for me shows that ...
4
votes
1answer
304 views

How to check image exists or not?

I'm working on Sweave and using includegraphics for include image in report dynamically. Pseudocode: <<> for ( i to 100) # run loop 1 to 100 { ...
4
votes
2answers
121 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 ...
3
votes
1answer
5k views

ifthenelse equal string comparison fails

I am trying to fix some problems with the accessibility.sty package from www.babs.gmxhome.de There is one string comparison which always results to false, i.e. the language code definition will not ...
3
votes
3answers
337 views

Show “Page X of Y” only if there are multiple pages?

I'm trying to add a line in the header to be "Page X of Y", but only if there are multiple pages. My main problem is how to format the if statement. So far I have \ifx \pageref{LastPage} 1 ...
2
votes
1answer
81 views

When using \IfEq to compare strings, is it one of those times when I should use an expandable xparse command?

I recently asked How can I migrate commands and environments from LaTeX2e to LaTeX3? [XeTeX] While that question is good, the answer is likely quite complex and would take a some time to effectively ...
2
votes
5answers
228 views

Package to test whether a string is in a list

Is there a package that provides a command for testing whether a string is in a list? I saw several answers that define their own commands to perform this or similar tasks, but I prefer a ...
2
votes
1answer
131 views

Nested conditional glossary terms using Glossaries \ifglsused in \newglossaryentry

If I want to conditionally expand a glossary entry based on or related to another glossary term, I find the conditional \ifglsused{}{}{} statement is very helpful. To satisfy parent modifications ...
2
votes
1answer
490 views

How to compare two counters using TeX conditionals in ConTeXt?

I have two counters, \definenumber[words] and \definenumber[items]. I have tried to use TeX conditionals to compare them, e.g.: \ifnum\getnumber[words]=\getnumber[items] This will print some text ...