{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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1answer
69 views

Check the value of a pgfkey

I need to be able to check if the value of a pgfkey is empty or not. A solution I have tried (using package etoolbox): \edef\temp{\pgfkeysvalueof{/path/key}}% ...
4
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2answers
73 views

Why is it not possible to embed \if construction in docstrip

I would like to create a DTX files which could be compiled in two different ways depending of a user's choice. One way to get only the user documentation, and another to get user documentation and ...
6
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0answers
139 views

Display beamer headline in frames conditional on section and subsection environments

I'm trying to create a beamer presentation (in LyX) where frames conditionally display a headline containing section and subsection navigation depending on (a) whether a frame is in a section ...
8
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1answer
80 views

Why won't \ifx match on list element of a foreach list if that element is a macro?

I have the following: \documentclass{minimal} \usepackage{tikz} \begin{document} \begin{tikzpicture} \def\nend{6} \def\rb{1.5mm} \draw (0,0) -- (\nend,0); \foreach \x in {0,...,\nend} {% ...
14
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2answers
387 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} ...
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1answer
54 views

Remove empty row inserted by etoolbox

I generate table with some conditional expression using toolbox package. \documentclass{article} \usepackage{etoolbox} \begin{document} \providetoggle{ch} \begin{tabular}{ |l|c|} \hline ...
4
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0answers
59 views

Checking environment in order to end it

I used to typeset verse with memoir package using some heavy \vspace trickery. The verse environment was too hard to control in terms of vertical space due to the immense amount of obscure glue. For ...
12
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4answers
473 views

Condition within condition

Consider the following logical satatements: If \conditionA != 100 and \conditionB != 100 do ``Something~A'' If \conditionA != 100 and \conditionB = 100 do ``Something~B'' If \conditionA = 100 and ...
3
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1answer
86 views

Check if a number is in a comma separated list (print or display selected sections from a specific list)

I'm trying to check if a section number belongs to a specified list: \ifnum\value{section}=\mylist % check if section number in mylist --- WRONG \dosomething \fi The conditional is ...
17
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2answers
367 views

Why does this simple \ifx test fail?

This should be easy, but I don't understand why the test below fails... I expected Hurrah! to be printed when the \currentchar count reaches 90 (i.e. the character code of Z). There must be some ...
7
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1answer
110 views

How to remove end-if in algorithms

I am writing an algorithm in latex, but there are lots of end-if and end-whiles in my algorithms which makes it un-professional and ugly. Is there a way to remove them from output of latex? ...
10
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2answers
154 views

Conditionally use package and define command

I'm creating a class which should define a command if some package is available: \IfFileExists{eforms.sty}{ \usepackage[xetex]{eforms} \everyTextField{\textFont{GaramondNo8}\textSize{12}} ...
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1answer
69 views

Can a latex IF loop take a perl variable?

I have a script written in perl which harvest data from an sql database, then produces a printed report in latex. I was looking to put an IF loop in the latex part of the script to print one set of ...
5
votes
1answer
198 views

Numerical conditional within tikz keys?

I would like to set up a presentation in which different parts of the same tikz picture appear, depending on the value of one, perhaps more, integer variables. I tried at first using a fixed picture, ...
18
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1answer
360 views

How to check if a variable contains a word in plain TeX?

I have a variable that contains a long list of keywords, e.g.: \keywords{computers, business, biology, fine art, literature, zoology} I need to make an if-then statement that checks for the ...
3
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0answers
176 views

Conditional formatting, rounding and postprocessing of a column in pgfplotstable

I want to round p-values in a table to two decimals (for example 0.05), have values less than 0.05 in bold font and have values less than 0.01 to come out as '<0.01' in bold font. Like this (the ...
5
votes
2answers
147 views

Is it possible to exit from the PostScript expression and abort the drawing?

I just want to draw a dot if the condition is satisfied and otherwise cancel the drawing of the single dot. The following code is the simplified version of my real scenario. Please don't suggest other ...
14
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3answers
902 views

Equivalent to “in” operator

I want to write a command that responds to an argument being in one set of reference strings or another. The argument takes a (musical) note name, and the command will print an accidental depending ...
10
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1answer
119 views

Pass conditional options to documentclass

I'd like to pass options to \documentclass basing on the compiler it runs, something in the lines \documentclass[if latex then use dvipdfm else nothing]{beamer} My motivation is that there're ...
2
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0answers
156 views

Constraint for a decoration: how to know result after decoration

My question is kind of extending of this answer. I want to decorate a path with text only when text fit the path, but also I want to know if decoration was success. I need to know this to be able to ...
5
votes
1answer
116 views

Using `ifthenelse` to combine two related functions into one

This question is based on Peter Grill's answer to "Table including rows of a master table".. The function PrintDTLTable was in Peter's original answer. I wanted a version that would run over all ...
4
votes
1answer
145 views

\ifnumcomp + \ref

I have a definition with 20 cases or so, and a proof about that definition has one case for each case of the definition. I'd like the proof cases to reorder themselves automatically when I reorder ...
7
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1answer
99 views

How to do pagenumbering in a fancy way

How do i get uneven increasing page numbers in the first half of my document, and in the second half in the second half? Example: 1,3,5,7,8,6,4,2 Here are my thoughts on how to solve it: My LaTeX ...
3
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0answers
59 views

how to add conditions inside itemize list?

List mentioned below is having three items. There are four variables : 1] varone 2] vartwo 3] varthree and 4] sub ; which are coming from external CSV file. Item 2 with "Value B" will be displayed if ...
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0answers
43 views

Indicating that the adjustwidth environment should be placed around text

I've been trying to work out a solution to this question about changing margins for body text without changing header/footer placement. Using the changepage package, I was able to work out the ...
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0answers
14 views

Commenting out large blocks in the preamble when in draft mode [duplicate]

I would like something to enable me to comment out large blocks of my preamble when I've specified that my document is a draft. The comment environment provided by the verbatim package works well for ...
6
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1answer
87 views

How to detect if there is one or multiple pages in a glossaries entry's number list?

I'd like to be able to print e.g. "p. 1" if an acronym is only used on one page and e.g. "pp. 1, 2" if it is used on multiple pages. I have tried to define a new counter and use its value in the ...
4
votes
1answer
66 views

Check if the last letter of a name is an s or x or neither nor

In German we have a (often disregarded) rule for using apostrophes. In English it is like so: "This is Mike's chair." In German it depends on the names ending. It's like this: "Das ist Mikes ...
2
votes
2answers
44 views

Display first (sub) environment in an environment

I would like to make a bank of problems of similar type--however, I only want to display the first of each time. For example: \begin{bank} \begin{exercise} 2+2 \end{exercise} \begin{exercise} 4+3 ...
7
votes
2answers
303 views

math conditionals using (if - else - fi) command

I saw these command when i searching sth. I wonder if we can increase numbers if conditions. it's like if{0} = a, if{1}=b, if{2}=c, if{3}=d etc. \newcommand{mycommand}[1]{ \if{#1 != 0} Some text, ...
3
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1answer
103 views

One source text, two outputs [duplicate]

I have very long source text. I want to create two outputs: All text Only small pieces of this source text, selected by condition command MWE (precisely: not working) \documentclass{article} ...
7
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2answers
117 views

\RequirePackage within \if\else\fi

Why does the package iftex have to be loaded outside of a \if...\else\fi structure? (The same goes for packages ifpdf, ifluatex, ifxetex.) Consider: ...
11
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2answers
187 views

New command with if/then statement conditioned on non-integer number?

In LaTeX, how do I declare a new command that gives different output depending no the result of a test with non-integer numbers? Specifically, I'd like to a command to compare a number with 0.01 (the ...
1
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2answers
141 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 ...
3
votes
0answers
62 views

Conditional Variation of \headheight

I'm trying to use \ifthenelse from the ifthen package to vary the size of \headheight within a document. I'd like this to be larger for the first page and then smaller for each subsequent page. I ...
8
votes
1answer
85 views

Very simple condition in macros

I try to define a macro in LaTeX. This macro should give a different output when I use condition true and false. This does not work: \documentclass{article} \usepackage{lipsum} \newif\ifABC \ifABC ...
12
votes
2answers
186 views

How to test whether the starred-version of a command is defined?

This question is similar to How to conditionally define a new command in LaTeX? but I want to test if the starred version of a command is defined. The naive thing \makeatletter ...
2
votes
1answer
190 views

Nested ifthenelse in tikz fails after arbitrary changes

Attempting to draw a random polymer mesh, which I intended to visualize by drawing a series of random walks between (x,0) and (x,1) where x is arbitrary. My first attempt is attached, and it compiles. ...
5
votes
1answer
79 views

Conditional expression to convert figure to table. Is it possible?

I have a though one for you: I'm writing in MultiMarkdown and all my figures, tables, charts are usually pictures. This allows me to write something like this: The MultiMarkdown input ![This is the ...
6
votes
1answer
62 views

Conditionally add multicols to enumerate environment

I would like an environment to be called by \begin{myenv} that conditionally adds multicols if called by \begin{myenv}{<number of columns>}. This is what I tried: \documentclass{article} ...
4
votes
1answer
85 views

Test if two things typeset identical results

I want to test if two somewhat arbitrary things typeset as exactly the same thing. For example I would like the test to tell me that abc is different from xyz, but is the same as \def\bar{abc}\bar. A ...
2
votes
0answers
139 views

Why can't I get a conditional command to work in a macro invoked within a tikzpicture?

I wanted to create a macro that can be invoked in the middle of a tikz path and behave differently, conditional on one of the arguments. Here is an example document: \documentclass[a4paper]{amsart} ...
5
votes
1answer
359 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> ...
8
votes
1answer
131 views

Fontsize determination

We usually point out explicitly or not normalfont size in \documentclass[11pt]{article} etc. 11pt may be absent here explicitly. Which variable contains this 11 or 10, 12pt?. I need get it in a ...
6
votes
1answer
276 views

Plot complex self defined function with TikZ

I'm trying to plot a function with TikZ that behaves different for several cases. Therefore I use an \ifthenelse in the \def statement. Using such a definition a plot with TikZ does not work. However, ...
2
votes
1answer
92 views

Conditional assignment in a loop

Objective: I want to compile the temporary.tex file containing PSTricks code twice. One with -jobname=Rotated and the other one with -jobname=Unrotated. The resulting Rotated.ps will be passed to ...
7
votes
1answer
143 views

Macros with binary trees as arguments

I would like to have some macros which have binary trees as arguments. For the purpose of these macros, a binary tree is either root or it is {branch1}{branch2} for two binary trees branch1 and ...
6
votes
2answers
132 views

How to optimize a conditional text translation?

I am working on a short story written in french, and containing a number of short dialogs in english. A friend suggested it might be a courtesy to potential readers to tranlslate the english content ...
3
votes
1answer
241 views

TikZ calendar and conditional tests

I would like to specially mark national holidays in my calendar. Some of the rules are "First Monday in June" and "Last Monday in October". I have been looking at the example on p. 280 of the PGF ...
7
votes
2answers
124 views

Generating random conversions

I am working on a system to randomly generate some exercises on unit conversion. The students get a exercise like 27.89 mm = ...... hm I achieved this whit the use of a random value generator ...