{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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7
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2answers
184 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 ...
2
votes
1answer
54 views

How can I write a conditional coloring command that distinguishes variables within titles vs within the body text with titlesec/titletoc/tocloft?

Question Is it possible to write a conditional statement for commands that change them based on where they appear in the document, yet is fully compatible with the titlesec package and the tocloft ...
2
votes
0answers
13 views

Definition conditional on pgfversion [duplicate]

Due to a change in behaviour between versions of pgf, I want to introduce a conditional definition that depends on whether or not \pgfversion >= 3. How can I do this?
29
votes
2answers
5k views

How to form “if … or … then” conditionals in TeX?

I feel really stupid for asking this, but how do you form more complex if conditionals in TeX? I'm looking for something like: \ifnum\x=1 OR \ifnum\x=14 {do this} \else {do that} \fi I ...
4
votes
1answer
40 views

Conditional code based on token

This is a follow-up question to Xparse Adding backslash after each command. xparse allows for conditional tokens to be inserted into the parameter text for a macro using the t<token> directive ...
4
votes
2answers
341 views

Is it a convenient way to write longer program codes in LaTeX?

Before I only used ifthenelse and for loops, but not complicated data structures. I don't know what is the convenient way to write longer codes. As an example I would like to generate a random ...
2
votes
1answer
15 views

Conditional \addlegendentry

How can I add legend entries dependent on some variable? At least it does not work in the minimal example below. \documentclass{standalone} \usepackage{tikz,pgfplots} \begin{document} ...
9
votes
3answers
387 views

Understanding the math tikzlibrary

In my question The Spiral of Roots in TikZ, the answer by Mark Wibrow caught my attention but while trying to edit the code I found myself struggling with an ifelse statement. What I am trying to ...
4
votes
2answers
65 views

ifthenelse doesn't work in case of string comparison

I tried to use this code to place footer in all pages except the last page in which I just want an "end". \ifthenelse {\equal {\detokenize{\thepage}} ...
1
vote
1answer
36 views

Optional address on letter

I'm trying to add an optional letter address that I can add to the letter by defining as true or false. Is there any reason why the address isn't printing? \documentclass[letterpaper]{article} ...
7
votes
4answers
1k views

Logical String Length

How do I do a conditional 'if then else' statement, based on length of string being greater than (or less than, or equal) a specified value. For example, something Like \def\mystring{XYZ} ...
5
votes
2answers
91 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} ...
22
votes
4answers
592 views

Is there an \iftex4ht command, and if not, how should it be defined?

Background: I'm using TikZ to generate a load of pictures that I want to put on the web as SVGs. So I'm using the pgfsys-tex4ht.def driver and it's working very well. My gut feeling is that the SVG ...
11
votes
0answers
120 views

Test if paragraph has an overfull line

I'd like to test if the last paragraph has any overfull line. The naive approach of looking at the \badness once the paragraph is finished does not work, as it will only give the badness of the last ...
8
votes
1answer
141 views

How to translate \ifthenelse from “ifthen” to “etoolbox”?

Trying to make conditional expressions that inspect the total page count of the document (see this question), I've found this solution using ifthen package: \documentclass{article} ...
3
votes
1answer
48 views

Conditional table construction with datatool

The following minimal example creates a 3-row table width a horizontal rule separating rows 2 and 3: \documentclass{article} \usepackage{filecontents,datatool,booktabs} \usepackage[table]{xcolor} ...
15
votes
4answers
493 views

How to compare numbers with decimal point and logical OR operation?

I'm reading five values from external CSV file as [\sone, \stwo, \sthree, \sfour, \sfive]. Sample values could be [55.3, 89.0, 33.5, 40, 0.10]. Question : How to compare number with decimal points. ...
4
votes
1answer
81 views

Why a `Missing = inserted for \ifnum` error for empty l3seq sequences?

I'm trying to use expl3 sequences in order to stored 0, 1 or more affiliations to 1 or more authors stored in a datatool database. The following MWE works nicely: \documentclass{article} ...
4
votes
2answers
91 views

Return original argument if csname is not defined

For some #1,#2 I define the \csname base:#1:#2\endcsname. Then I define the following \def\data#1#2{\ifcsname base:#1:#2\endcsname \csname base:#1:#2\endcsname\fi} and afterwards ...
6
votes
1answer
179 views

Is it possible to test whether small caps are available with the current font?

Is it possible to test, in the document body, whether small caps are available with the current font (both for pdf(la)tex and xe(la)tex)? What I'd like to do is something like: \usepackage{xifthen} ...
3
votes
1answer
43 views

Set PGFplots coordinate label using ifnum

I can't overcome this little nasty issue. Using \ifnum I set labels position around the coordinates in my pgfplot. This works fine but : I am only able to test if variable \coordindex is greater or ...
3
votes
1answer
48 views

Checking the mainmatter

I need to check where the text (from package .sty), if it is in the mainmatter section, then include some headers \pagestyle{LL}, if the other then \pagestyle{plain} or some other. Construction ...
9
votes
3answers
214 views

Why in the discussion of the definition of \newif are the following things true

This is a couple of questions that stem from the answer to Problems understanding definition of \newif by @egreg. In that @egreg says Let's look at \expandafter\expandafter\expandafter ...
8
votes
2answers
145 views

Incomplete \iffalse using \phantom

Can anyone help me debug the code below? As written, it produces an Incomplete \iffalse error on the \xdef line on the final iteration. The problem is somehow related to the \phantom macro, as ...
9
votes
1answer
231 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 ...
3
votes
2answers
130 views

How to pass vertical line

I have the following problem. The general idea is to test whether #1 is empty and if it isn't then write vertical line "|" and #1: \documentclass{article} \usepackage{makeidx,hyperref} \makeindex ...
0
votes
1answer
34 views

Command (using \ifthenelse) within 2nd optional (post) argument of footcite

I have defined a new command \mypageref to reference page numbers of text parts in my appendix. The begin of such a text part is labeled, e.g., by \label{text_begin}, and the end of the text part is ...
2
votes
1answer
28 views

If used insdide \cs_new(_protected), \IfNoValue(TF) doesn't detect -NoValue- at document-level

I guess my problem is related to Commands from xparse inside functions created by \cs_new:Npn? but I still don't understand what's going on: in the following WE (not minimal, sorry for this), why ...
2
votes
2answers
41 views

Make an item in itemize disappear if a condition is not met

Here is the MWE: \documentclass{article} \newcommand{\VarOne}{1500} \begin{document} I want this list to have item Two if VarOne is more than 1000. If it is not, this will be a two item list. By the ...
5
votes
1answer
93 views

Conditional statement in beamer style file

Here is an example of a part of a beamer style file I use for a presentation: { \nointerlineskip% \begin{beamercolorbox}[wd=\paperwidth,ht=0.6cm,leftskip=.3cm,rightskip=.3cm]{frametitle} ...
1
vote
1answer
35 views

Biblatex: Selecting content depending on language

I am using biblatex and would like to quote English and German works. When writing a document in German, this works nicely with the help of \DeclareLanguageMapping and hyphenation to specify if a ...
3
votes
3answers
140 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?
2
votes
1answer
107 views

How to conditionally draw nodes of a tree in TikZ

I want to draw several trees with tikZ (Version 2.10) which are very similar in the sense that there is a first tree and the others are obtained by ommiting some of the nodes of the first one. I ...
5
votes
2answers
465 views

(x)ifthen in TikZ

I am searching for a way to conditionally handle some items in a TikZ \foreach specially using an \ifthenelse condition. However, the compiler responds ! Undefined control sequence. <argument> ...
2
votes
2answers
46 views

Environment which sends text conditionally to an appendix?

I am writing a paper and would like an environment that has the following property. If some flag is set to "true" in the preamble, all text wrapped in that environment is sent to the appendix. If the ...
1
vote
1answer
105 views

Incomplete \iffalse error in AMS alignment

MWE: \documentclass[a4paper]{report} \usepackage{amsmath,xparse} \makeatletter \newif\ifinvd@lims\invd@limsfalse \newif\iflr\lrfalse \ExplSyntaxOn \newcommand{\delim}[3][lr]{ \begingroup ...
3
votes
1answer
104 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 ...
5
votes
1answer
69 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 ...
40
votes
4answers
7k views

How to check if a macro value is empty or will not create text with plain TeX conditionals?

I have a macro which holds some text value, e.g. \macro{some text}. If it is empty, I would like for nothing to appear in the document, but it has some content of any kind which would produce text ...
3
votes
1answer
72 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
2k 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} -> ...
4
votes
1answer
178 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
62 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
77 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
votes
1answer
85 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
11 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
152 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
58 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
58 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
111 views

Incomplete \iftrue is valid input?

Is LuaTeX beta-0.79.1 correct in thinking the following is valid input: \iftrue \bye