{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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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
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0answers
49 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 ...
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2answers
90 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 ...
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1answer
33 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
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1answer
154 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
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113 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 ...
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37 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 ...
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3answers
109 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
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108 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: ...
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1answer
118 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
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1answer
51 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
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1answer
70 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 - ...
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5answers
373 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?) ...
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1answer
41 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
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1answer
64 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 ...
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62 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
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1answer
48 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
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1answer
57 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
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1answer
68 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 ...
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2answers
76 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
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1answer
55 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
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1answer
65 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, ...
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2answers
696 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 ...
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2answers
74 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 ...
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2answers
297 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 ...
0
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1answer
60 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 ...
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2answers
35 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. ...
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51 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 ...
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2answers
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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? ...
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2answers
258 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
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0answers
75 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 ...
4
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1answer
375 views

Simple if statement latex

Having difficulties understanding basic latex operations I want to use: if not (number between x and y): next iteration in loop Can anyone help me with a simple if statement for this? \newread\reader ...
3
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1answer
45 views

Print text when bibliography is empty

With biblatex, I'm looking for a way to check if the bibliography is empty, and if so, print some custom text. Something along the lines of this pseudocode: \ifempty\thebibliography [[ no ...
3
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1answer
55 views

conditional loop printing text and icon

I'm new in the Latex world. I'm writing a little guide and I've choose Latex, in particular Texmaker for writing it. I'm trying to do a loop for printing some instruction as File -> Save as -> Ok. ...
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24 views

How to define a show/hidden switch? [duplicate]

I'm preparing some notes, basically some theorems and their proofs. I'd like to define a show/hidden switch, so that when it was turned on (to show) , all content are generated into the pdf; if it's ...
6
votes
2answers
51 views

Background image used for a whole section/chapter at once

I've seen a few examples with \BgThisPage being used to specify a background image for 1 single page (or another command to set one for ALL pages at once). Those two extremes are the only options I ...
6
votes
1answer
70 views

testing parameter values with \ifx

Let's say that I would like to redefine \@seccntformat so that whenever the section counter is printed, it is prefixed by Section, but other counters should no be changed. Here is my failed attempt: ...
19
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6answers
9k views

If Then Else for odd page/even page

How to use if-then-else structure in LaTeX? I need a example of odd and even page. if odd then command 1 else command 2
2
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1answer
37 views

LYX - Conditional Sections

I've created an automatic report for my company that gets some input datasets and automatically returns a data analysis report with texts, figures, tables, and some data analysis results. Depending on ...
2
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2answers
137 views

Strange errors while writing a package

This short document: \documentclass[a4paper]{report} \usepackage{gnu} \begin{document} \end{document} with the following package: %!TEX encoding = UTF-8 Unicode \def\fileversion{2.7} ...
31
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7answers
7k views

Conditional typesetting / build

Let's say I have .tex file which is a set of problems and solutions, of which I want to make two pdf files, one which includes the solutions and one which doesn't. so I need to build the .tex file ...
14
votes
2answers
389 views

String comparison in \ifthenelse

I want find a certain line of text in a data file cities.txt: A;London B;Berlin C;Paris with the xstring and [xifthen][2] packages: \documentclass[12pt, a4paper]{article} \usepackage{xstring} ...
3
votes
1answer
70 views

Is there a way to know how often latex has already run? [duplicate]

A few days ago, I have seen an example of a latex file, that did conditional \defs on subsequent runs but I can't find that one again. I still remember that it was by looking into the \jobname.aux do ...
7
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3answers
114 views

Conditional compilation of code based on package version [duplicate]

I am working on a document with a colleague and we have different versions of PGF/Tikz installed -- I have version 3 and he has version 2.10. This is causing a problem for compilation on our two ...
4
votes
1answer
71 views

How can I loop back to a slide after showing conditional slides in Beamer?

I am working on a presentation that has conditional slides, using the formatting suggested here: Conditionally hidden slides in beamer I would like to be able to continue with my presentation after ...
7
votes
2answers
85 views

Detect closing braces with a command

I want to make a command that detects if the next token written in the document is a closing brace. My best approach is to use the \@ifnextchar command. In fact, the following code: \makeatletter { ...
24
votes
2answers
12k 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 ...
9
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1answer
120 views

Function rotated about the x-axis

I try to reproduce some figure from that file: http://tug.org/TUGboat/tb33-1/tb103wolcott.pdf I exactly need Figure 7: f(x) = sin x rotated about the x-axis. The code for Figure 7 is in appendix B. ...
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2answers
143 views

csvsimple filtering problem

The following code works as I would expect. \documentclass{scrartcl} \usepackage{csvsimple,filecontents} \begin{document} \begin{filecontents*}{chunk.csv} AAAA,aaaaa BBBB,bbbbb CCCC,ccccc ...
15
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2answers
332 views

\ifnum command with multiple conditions (lower and upper bound)

First time posting here, very much a novice. I'm creating some background templates in beamer and I can't figure out why this \ifnum command isn't working properly. This is the code: ...