{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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4
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2answers
57 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
47 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 ...
2
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0answers
63 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 ...
0
votes
1answer
64 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, ...
13
votes
2answers
686 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 ...
1
vote
2answers
61 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
291 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I found several entries about the fact that the ifthen package is obsolete.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
votes
1answer
50 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
33 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
44 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 ...
38
votes
2answers
6k 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? ...
7
votes
2answers
251 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
59 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
votes
1answer
128 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
votes
1answer
40 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
votes
1answer
49 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. ...
0
votes
0answers
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
44 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
55 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
votes
1answer
33 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
votes
2answers
129 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
votes
7answers
6k 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 ...
3
votes
1answer
47 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 ...
14
votes
2answers
360 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} ...
10
votes
1answer
135 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} ...
3
votes
1answer
68 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
votes
3answers
104 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
64 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
82 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 { ...
23
votes
2answers
11k 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
votes
1answer
111 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. ...
1
vote
2answers
135 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
votes
2answers
239 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: ...
4
votes
1answer
44 views

Using character literals with \ifcase

Is there a way to implement a switch-like macro in LaTeX or do I have to nest ifs? Something that would look like: \ifcase#1 \case a{} \or\case b{} \or\case c{} \fi If not, could you ...
0
votes
0answers
36 views

A&A template returns error \renewcommand{\Newassociation}

I got the template to make scientific papers from the Astronomy&Astrophysics official website. Since I can not compile my own document, due to an error, I tried to compile the demo that is within ...
2
votes
0answers
43 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 ...
3
votes
1answer
52 views

Conditional structure based on \rand value comparison

I have a simple code that inserts a complex layout for figures and I would like to randomly alternate the position options (for instance, alternating between top and bottom positioning: ...
15
votes
3answers
824 views

Implementing switch cases

I'd like to have command built around a switch-case environment in LaTeX, much like the example below: \documentclass{article} \usepackage{xstring} \newcommand{\dothis}[1]{% \IfStrEqCase{#1}{{a}{so ...
6
votes
2answers
185 views

If-then-else inside TikZ graph?

I want to draw a graph like in the second picture of the following code: \documentclass{article} \usepackage{mathptmx} \usepackage{tikz} \usepackage{verbatim} ...
2
votes
1answer
67 views

Multiple choice questions type setting

See the fourth question: the choices are showing twice one is along horizontal and another is along vertical, but I need only one like the above three. The commands I have used is given below. ...
5
votes
2answers
141 views

Define a New Macro via a Macro Using xparse Syntax

I am trying to set up a macro that defines a macro that is to be executed only once. With what I learned from Define a Macro via Macro if Given Macro is not defined I can do that via the ...
3
votes
1answer
44 views

Variable scoping of edef definitions in a local group (inside an ifx conditional)?

Consider this MWE: \documentclass{article} \def\testswitch#1{ \def\isA{A} \def\firstOpt{#1} \edef\tmpstr{-init-} { % start local \edef\tmpstr{-loc defined-} } % end local ...
7
votes
1answer
91 views

How can I set up my custom class to load a different class depending on the class option(s) passed?

I have written class files in the past. One of them is even up on CTAN. But that was ages ago, and I am rusty today. I am trying to roll a new class file for my University. I am being a little ...
1
vote
0answers
30 views

Creating multiple output files, with content that depends on a variable

I'd like to write a template for a letter, which is meant to be sent to many people. Thus, the content should change slightly depending on who is the addressee. For instance, I imagine that the ...
8
votes
3answers
163 views

How to include a second file only if environment variable is set?

I have a LaTeX document which exists in two versions, a short version and the long version. The long version has an additional chapter inserted in the middle of the document. What I want to do, is if ...
6
votes
3answers
173 views

A reusable newlength (no stop/break if length already defined)

Often I have separate .tikz files, which may contain stuff like \newlength{\mytmplen}; and given I'm not very original with names, the same statement ends up in multiple such files. Which turns out to ...
1
vote
0answers
57 views

macro: repeat a command if new page else do nothing

QUESTION: How does one write a pair of macros that work in 1) beamer class and 2) article class, respectively, such that if it, \macroname{...}, is executed at a point in the code, that point ...
1
vote
1answer
81 views

Referencing \pgfmathsetmacro variable inside an \ifthenelse statement

How do I correctly reference a value calculated using a \pgfmathsetmacro definition when defining the check condition of an \ifthenelse statement? Example Problem; Randomly scattering nodes within a ...
3
votes
1answer
36 views

Conditionals inside document

Sorry I was not able to reproduce this problem outside Friggeri's CV template... I am using Friggeri's CV template with the same friggeri-cv.cls (I have only changed all the Helvetica fonts to ...