{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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5
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1answer
76 views

Wonky behavior from \@ifnextchar,

When I compile the below MWE the first \@ifnextchar, always evaluates to false, which is clearly wrong in the last case. However, the second one (within \punctuationcheck) works just fine. Why would ...
3
votes
1answer
103 views

program IF-THEN-ELSE alignment

I am using the 'program' package to describe a function. When I use the IF-THEN-ELSE statement I expect the lines to be aligned relative to the 'if'. But the lines are aligned relative to the 'then'. ...
25
votes
5answers
3k views

Testing for number

How do I test if a given parameter is a number, in order to apply a different style? And if not, just ignore... Like: \domorestuffifnumber{things} -> things \domorestuffifnumber{123} -> ...
5
votes
1answer
185 views

LaTeX block conditional including

I am researching possibility of building an automatic brief datasheet template in LaTeX, taking data straight out of a database. The database connection part is possible and can be done with such ...
3
votes
1answer
97 views

Nested \ifdefined statements

I am trying to populate a list of variables (in the attached example starting with \@addressone) with the values obtained from a set of commands. The first variable will get the first of whatever ...
4
votes
1answer
93 views

Trouble setting header content conditionally with titlesec and extramarks

I'm writing a commentary on a Classical text and trying to imitate many of the layout choices of the Cambridge Greek and Latin Classics series. In particular, I've been working on having the header ...
4
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1answer
119 views

incomplete ifnum

I am using a loop to define keys with the xkeyval package, as well as to actually read out the keys inside some self-defined command. Everything works perfectly - but for some reason, as soon as I ...
1
vote
0answers
13 views

overfull \hbox ..with figures (like to do If scale>width, use max width) [duplicate]

Well, I'm having a problem with figure. I'm using figures like this: \begin{figure}[!ht] \centering \includegraphics[scale=1]{\importacaodedados importacaodearquivos.png} \caption{Importação de ...
10
votes
4answers
154 views

# in conditionals in alignment tabs?

I am looking for ideas how to make TeX understand that when # appears both in the if-else and in the else-fi part of a conditional in an alignment tab, in the end there will never be more than one # ...
3
votes
1answer
72 views

Opening and closing brackets in combination with the ifthen package

Related to this question, however, I was not able to solve my problem. Let me give some background. I want to switch between the article style and a specific journal style. The journal style has ...
4
votes
2answers
74 views

Randomly select one of two possible texts

Let's say I have two possible questions. I want only one to be on the generated PDF and I want this one to be randomly selected among the two potential candidates. I thought this would be sufficient: ...
8
votes
1answer
148 views

Incomplete \iftrue is valid input?

Is LuaTeX beta-0.79.1 correct in thinking the following is valid input: \iftrue \bye
1
vote
1answer
27 views

Is there a way to display a specific command and hide the rest

I would like to use the same Latex source file for both my document and the accompanying slides. When creating a document it's easy to hide the slide sections by doing this: \newcommand{\slide}[1]{} ...
2
votes
1answer
91 views

How to test whether pic text is empty in TiKZ?

If I wish to add a pin to a node in TiKZ, I can do so like this: \documentclass[tikz,border=5pt]{standalone} \begin{document} \begin{tikzpicture} \node [draw, thick, circle, minimum ...
1
vote
0answers
21 views

Conditional for documentclass [duplicate]

I was wondering whether it is possible to execute a command depending on the used documentclass. \documentclass{dinbrief} %\documentclass[a4paper]{letter} \usepackage{ifthen} \begin{document} ...
3
votes
1answer
72 views

Smaller vertical space between repeated environments

I have a new environment that is defined with addvspace at the beginning and end. This works fine if it is surrounded by text. Now, I want this space to be smaller (smallskipamount) between these ...
13
votes
2answers
245 views

ifx, macros and grouping

I do not understand how \ifx interacts with macro definitions. Here is a minimal example: \def\a#1{\b} \def\b#1#2{[#1:#2]} \a ABC The output is [B:C], as expected. If I change the definition of \a ...
3
votes
2answers
113 views

Conditionals used in defining of new environment

I want to produce two versions of one document with different content. The idea is to comment out certain sections if a logical variable is false. This logical variable will be inputted eventually ...
16
votes
2answers
843 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 ...
7
votes
5answers
302 views

Read number from file

I have a file called _runs.ini. Depending on its content, the document is compiled differently. I tried to read the content and executed a \ifthenelse-command without success. Here's my MWE: ...
7
votes
2answers
174 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 ...
4
votes
1answer
85 views

Аnalog of \ifodd condition for verification if page number is equal to some constant

I have a great example of using \ifodd condition if \makeatletter environment showed by @Symbol 1. \begin{document} \makeatletter \newbox\LT@oddhead \newbox\LT@evenhead ...
3
votes
2answers
142 views

LaTeX3: If next in input stream is command X or environment X, do Y else Z

Because I write my own document class (okay, I try to ...), this question bothers me for weeks as there are many situation, in which I need something like this. Is there a way to test, if the next ...
1
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1answer
37 views

Is there a way to have different behavior for even pages and odd pages

I would like to modify the below template so that it prints out 1 problem per sheet. Example: Problem 1 on pages 1-3, problem 2 on 5-6 and nothing on page 4. Another Example: Problem 1 on Pages 1-2, ...
12
votes
1answer
217 views

What's the difference in behavior between ifx and ifthenelse?

Why does the \ifx test give a different answer than \ifthenelse in the following simple example? testclass.cls (without the head and tail): \newcommand{\isempty}{\@empty} ...
7
votes
1answer
132 views

Omega appears from if result

I am attempting to edit an if statement that I was using in an environment I created. Previously, the code was \if #1\empty \else \textbf{#1.}\hspace{0.5em}% \fi I want to change it to something ...
0
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0answers
43 views

Output two files

I'm tiring of maintaining two different CV and resume .tex files and want to combine them into a single file. I'm considering etoolbox as a way of combining my CV and resume into the same. Then I ...
4
votes
3answers
237 views

Tikz: draw a circle only in selected nodes

I created a table of nodes using tikz. And now I want to draw a circle inside every even node. I started from just trying to draw a circle in the second node. But my code is not working: ...
8
votes
1answer
130 views

Defining a command that scans every arguments' macro “looking for” a token

Knowing that every command declaration with conditionally optional arguments, as \foo{...} expanding into \foo[default]{...} can be defined by \newcommand\foo[1][default]{...} or the safer version of: ...
4
votes
1answer
123 views

Conditionals—do something, if a given command is being used in the document

Is it possible to have a conditional that allow us to do something if a given command is being used in the document? For example for the \part command would be: ...
5
votes
1answer
126 views

Defining a command that conditionally defines/checks for counters

In order to complete one custom package command I needed an internal macro, I called it \@test@count{❬argument❭}, and should accomplish the following: Internally defines a new counter \❬argument❭ ...
4
votes
1answer
78 views

Write multiple pdfs with different options

Thanks a lot for the help in advance. This might be a stupid question, or a potential overkill for this kind of forum, but the situation is as follows: I'm writing my dissertation and - of course - ...
8
votes
5answers
416 views

A command which concatenates a string an arbitrary number of times

I'm trying to define a command \repeatstring{#1}{#2} which repeats the string #2 #1 times. Here is what I tried: (it is based on what I found in How to concatenate strings into a single command?) ...
0
votes
1answer
88 views

Showing/Hiding verbatim environment based on boolean condition

I would like to show and hide a verbatim or spverbatim environment based on a boolean condition (sth. like \showenv). I tried the solutions proposed at Hide custom environment content based on ...
5
votes
1answer
190 views

Conditional based on the version of pdflatex?

I would like to do this: \pdfsuppresswarningpagegroup=1 However, this feature is only supported by pdftex 1.40.15 and higher. How can I do this conditionally, so that my document won't be broken in ...
1
vote
0answers
88 views

Conditional spacing based on length of chapter title

In LaTeX, (or possibly XeLaTeX), how can one achieve the following: A double spacing a 1- or 2-line chapter title, and single spacing under a 3- or more-line chapter title. A triple space ...
4
votes
1answer
60 views

Auto colour numbers in range

If I had some numbers in a tabular column, is there a way to automatically change the font colour of them if they are outside a range; eg red if under 10 and green if over 50? \documentclass{article} ...
2
votes
1answer
74 views

conditional placement of ocg content

I am using ocg-p package to add layers of information in a pdf document, to be accessed by the reader interactively. To place the ocg layer in the desired location on the document I used rput command ...
4
votes
1answer
84 views

text inside tikz node which can skip to an other

I would like to put text in a mini page with fixed length inside a tikz node using \sbox , if the text skip a specified length (10cm) it will be saved in an other \sbox and used inside a tikz node ...
6
votes
2answers
191 views

How can I check if the filename of a LaTeX document contains a string?

I am preparing a LaTeX beamer presentation for students. I am looking for a simple way to create two versions of my presentation. One version for the Students, which just contains the text of the ...
3
votes
1answer
73 views

Conditional Zebra Tables

First, I'm using LyX with a rather long preamble because I want things fairly specific, but almost all the code in the preamble is cut-n-pasted from the 'Net with a couple modifications. I'm not a ...
0
votes
1answer
72 views

Menu Selection in LaTeX [closed]

I want to create a menu selection for different documents, what I mean for example is to run latex over the terminal, and the terminal prompt you if you want to create a diploma, a letter, a book, ...
1
vote
2answers
210 views

Ifthenelse variable equality

Last week I made simple coordinate transformation in order to define \tdplotsetcoord in Cartesian coord. system. My work and support of exp. user can be viewed in this topic. The code looks as ...
4
votes
2answers
370 views

How to define a if-condition? [duplicate]

I found several entries about the fact that the ifthen package is obsolete. So my question is: how to define a condition check then? I have searched and I find several example for ifthenelse ...
2
votes
1answer
1k 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 ...
4
votes
2answers
47 views

vspace mysteriously being inserted after nested custom environment

I have created my own environment that creates a table using tabu and then puts some vertical space after it, unless my environment is being nested, in which case I want it to skip the vertical space. ...
0
votes
0answers
75 views

How do I add multiple macro definition inside an \ifbool compound statement?

What follows is my example doofus.sty: \NeedsTeXFormat{LaTeX2e} \ProvidesPackage{doofus}% [2014/01/01 v0.01a LaTeX doofus package]%\filedate\space\fileversion\space \typeout{Package doofus, \csname ...
41
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2answers
8k views

What does \ifx\\#1\\ stand for?

The following usage of \ifx can be found in several packages and also in answers on this site. What does this syntax exactly mean? Are there any alternatives and drawbacks? ...
8
votes
2answers
317 views

Is there any analog to #pragma once in (La)TeX?

In C, I can write #pragma once as a preprocessor directive at the top of a header file, which tells any compiler that supports it to include the file a maximum of one time per compilation cycle, ...
3
votes
0answers
104 views

\if and \fi inside different \def macros

Recently I failed to solve specific task in LaTeX. I wanted to make document with several sections, each divided on several subsections. Each section I had placed to separate files, and used \input ...