{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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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
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3answers
208 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
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3answers
269 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 ...
2
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0answers
95 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 ...
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1answer
182 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 ...
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1answer
47 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 ...
2
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1answer
52 views

Conditionally change font color of number passed from pythontex

I would like to color numbers red if they are less than zero. In my final report, these number will be generated from a python script. To use the pythontex package, I first run xelatex doc.tex, then ...
8
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2answers
198 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 ...
6
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1answer
147 views

Using conditionals in tabular preamble with array

I'm trying to use a conditional in the column setup for my tabular. That is, the definition of one column (actually several columns) is dependent on a boolean value (as set up from the etoolbox ...
2
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1answer
88 views

How to test if a string is empty

I tried several thing to test if a parameter is empty or equal to a specific carater. How should one proceed ? By the way, what is the best way to have conditionnal code on a parameter who can have ...
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5answers
206 views

new command with cases?

This has been answered here for text outputs with the use of \IfEqCase from the xstring package. But if I want to use the output as a value to set a parameter in a function, it fails. Here is my MWE: ...
8
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2answers
70 views

“Extra \else” and inserted “\inaccessible” when using textbf with pgffor

I'm getting errors whenever I try to make \textbf interact with pgffor and xparse. Here's an MWE that gives ERROR: Extra \else and ERROR: Missing control sequence inserted at the end of the \coljoin ...
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2answers
173 views

Why does this use of `\expandafter` not work?

I've written the following code: \newif\ifconsecutive \consecutivefalse \newcommand{\myfirst}[1]{#1\consecutivetrue\expandafter\consecutivefalse} \newcommand{\mysecond}[1]{\ifconsecutive ...
21
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2answers
3k views

Use “default” figure if file is missing?

I was recently in charge of organizing all of the references and labels in a very large scientific proposal document. My workflow typically involved compiling the document, seeing a "There were ...
2
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1answer
56 views

Customizable inclusion of frames-slides from a huge Beamer presentation [duplicate]

I have one master-huge beamer presentation having lots of frames. Depending on the audience I wish to customize, say, for lay audience I will just include basic slides, for experts I wish to include ...
3
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1answer
64 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 ...
5
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1answer
80 views

How to detect if \thepage is undefined?

The sig-alternate class by default disables page numbers, which breaks mparhack (amongst other things). How can I include tex code only if \thepage is properly defined? I tried \ifcsname and ...
5
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1answer
77 views

How to use If with on variables

I want to create my own documentclass and use some variables for creating titlepages etc with it. So what's the best way/package for doing this? the class file: \ProvidesClass{myOwnClass}[v0.1] ...
6
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1answer
213 views

How to do a conditional line break

I want to know how to do a conditional line break. Whenever the error message "There is no line to end here" comes, I want to disable the line break, otherwise to enable it, with a \\ command or ...
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2answers
72 views

newcommand with variable number of arguments

I have seen several related questions, but none seems to address specifically this. I would like to define a command that accepts a variable number of arguments. Something like ...
6
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2answers
106 views

Suppress month and day for journal articles and maintain for a newspaper articles

I haven't found a solution yet for this problem. I want to suppress month and day (if present) from all journal articles in bibliography but I at the same time I want to indicate year, month and day ...
1
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1answer
46 views

Macros with \fi for showing and hiding proofs [duplicate]

I would like to be able to globally showing and hiding proofs on a document, and be able to use macros to open and close the proof environments. Here is my current MWE: \documentclass{article} ...
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29 views

Changing a macro's output depending on immediate context [duplicate]

I've set up a macro for differential parts as so: \newcommand{\dd}[1]{\,\mathrm{d}#1} which is useful for differentials at the end of integrals because of the space. (I realise the argument ...
2
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1answer
29 views

textpos toggling noshowtext option

Is there a way of toggling the textpos option [noshowtext]? I would like some textboxes to show the frame but not the text. And others to show both frame and text, but can't seem to find a way of ...
2
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1answer
492 views

how to use memoir \ifoddpage

Why does \ifoddpage seem to always return false in the following example? This is related to question 6143 on this same forum. I'm using XeLaTeX to produce a pdf file (i.e., xelatex test.tex) ...
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3answers
182 views

Global Conditional

I'm writing a set of notes for my students on trigonometry. At present, they have not met radians, which comes next year. I would like to use the same set of notes for them, but this year, give them ...
16
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4answers
2k views

Making switch/case with etoolbox's \ifdefequal

I've got a define such as \def\doctype{SomeString}. \doctype can take on one of five values. I want to do something like a switch statement in a programming language, i.e. (pseudocode): switch ...
9
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1answer
203 views

Problems understanding definition of \newif

Reading http://profs.sci.univr.it/~gregorio/introtex.pdf, I have come across the definition of \newif on page 75: \def\newif#1{\@ifdefinable{#1}{\@newif#1}} \def\@newif#1{\count@\escapechar ...
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2answers
147 views

Detect whether I'm in a \footnote?

How do I detect whether I'm in a \footnote environment or not?
3
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2answers
67 views

Detect whether I'm on a left- or right-hand page? [duplicate]

How do I detect whether I'm on a left- or right-hand page? I would like to define a custom command with a conditional statement that executes a certain command if it's on a left-hand page and another ...
0
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0answers
27 views

Make left-hand pages' `\marginpar` text right-aligned [duplicate]

\marginpars only appear on the right margins of right-hand pages of my manuscript. For left-hand pages, they are are so far to the left that they aren't even on the page. The reason is because the ...
2
votes
1answer
123 views

How to get float numbers as parameter of \newcommand

I have defined a \newcommand function like into this code: \documentclass{scrartcl} \usepackage{pbox,calc} \newcounter{pointsExo} \setcounter{pointsExo}{4} \newcounter{pointsSousTotal} ...
5
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2answers
98 views

Is there a way to query the page size that I have set in the memoir class?

In my preamble, I have: \documentclass[a5paper,10pt,oneside,onecolumn,openany]{memoir} I would like to later define some layout options based on the value of the page size, which in this case is ...
6
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2answers
101 views

How to distinguish between Metafont and MetaPost?

Background I'm trying to make a nice SVG out of Knuth's Dangerous Bend symbol based on his own code, for which the obvious tool to use is MetaPost. However, I'd prefer to still be able to process the ...
4
votes
1answer
172 views

FancyVerb Error when using minted in a \ifthenelse

I'm new to LaTeX and wand to add some code with minted, which will only be rendered, when a \boolean variable is true. Here's my code: \documentclass{article} \usepackage {minted} \usepackage ...
4
votes
1answer
101 views

Command to disable environments [duplicate]

I have defined an environment called answer that displays the answer of a question of a test I'm supposed to prepare. The idea is to compile a version where the answers are displays and one were they ...
2
votes
1answer
214 views

TikZ-ifthen: decision making in a \foreach statement

Disclaimer I am not a programmer so I may not use the proper terminology to express myself. Please correct me if need be. Preamble I'm trying to draw a sinusoidal function and some arrows at ...
5
votes
1answer
61 views

How to check whether two labels fall on the same page?

I'd like to have something like 5--10 in the header of an article (my document is a journal issue) if it spans the pages 5-10, and 5 (as opposed to 5--5) if it is short and fits on one page. I use ...
4
votes
1answer
69 views

How to swap subcaptions of zoomboxes?

I greatly appreciate the zoomboxes given in this question: How to create magnified subfigures and corresponding boxes for portions of a large image. As the comments thread is already long enough I ...
4
votes
1answer
294 views

Conditions for fancy chapter title

I use a book class and here is a part of my fancy title page for the mainmatter chapters. \newlength\chapterwidth \settowidth\chapterwidth{\huge\chaptertitlename} \titleformat{\chapter}[display] ...
34
votes
3answers
4k views

Difference between \if and \ifx

I try to understand the subtleties of TeX programming, but it is not always easy. For example, in the following code : \def\first{abc} \def\second{abc} \ifx\first\second OK!\else false \fi I ...
1
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1answer
95 views

Conditional formatting in moderncv

We busily discussed a method of implementing conditional statements in the moderncv class (Conditional content in moderncv) last month. Sean Allred came up with a great solution to solve this (see ...
21
votes
1answer
128 views

Is implicit `\relax` in conditionals explained anywhere in the TeXbook?

I have been relying for years on TeX's behavior where, say \if1\fi expands to nothing and \if1\else\fi does the same. In the second case TeX inserts an 'implicit' \relax when it tries to expand \else. ...
16
votes
2answers
174 views

Does etoolbox's \ifboolexpr use lazy evaluation?

In other words, is bool{testB} evaluated at all in this example code? \newbool{testA} \newbool{testB} \booltrue{testA} \booltrue{testB} \ifboolexpr{ bool{testA} or bool{testB} }{OK}{Something's ...
5
votes
1answer
67 views

how to use conditional to define different \begin and \end environment at compile time

I just need little help on the syntax for this. I am using tex4ht, and I get an error when I use empheq for the align environment. I want to build this TeX file both in pdflatex and htlatex. I ...
6
votes
1answer
62 views

Conditional based on character following the macro

Basically, I would like to something like \xspace does, i.e. the meaning of the macro should depend on what is following it. So for example if I say \mymacro a it might expand to foo, and if any ...
1
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0answers
62 views

Special conditionals (TeX)

Is there a way to compare strings rather than single tokens? Is there a way to check if a parameter in a command is a string or a single character? If there is either, how do I?
5
votes
1answer
141 views

Only show header if section number > 0

The current section name + chapter.section number is shown in the header. This is normal behaviour (what I want). Example: How can I remove the header text, if there is no section on the page. The ...
0
votes
0answers
22 views

Conditional on counter definition (TeX) [duplicate]

Is there a way to make a conditional where the test is the definition of a counter with a specific name, i.e. "if there exists a counter named foo, then do [bar], otherwise do [baz]"? If so, how do I ...
2
votes
1answer
147 views

Conditionally Hiding Parts of Bibtex Fields Depending on Language Field Value

I would like to create a document with a bibliography using XeLaTeX with Biber. In the bibliography, there are Chinese books and articles, as well as English or German ones. Some of the authors have ...