Please do not use this tag for general LaTeX questions. {latex3} is about the new material being developed by the LaTeX3 project. This includes the expl3 programming language along with higher-level concepts such as xparse and xtemplate.

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2
votes
1answer
21 views

Including a multi page PostScript document into latex

Is there a hack to include a multi page Postscript document into a a final ps document through latex and dvips? Essentially what I have is a ps article that i need in my latex>dvi>ps document. Is ...
4
votes
1answer
36 views

Modify contents of environment using l3regex and then write to file

I want to define an environment (in a class file, as it happens) the contents of which are both displayed on-screen as they are written, but they are also modified (e.g. using the l3regex package) and ...
1
vote
2answers
82 views

Vertical spacing in list — latex3 syntax

Consecutively to this question, I need to add something after the inclusion of on itemed file to be sure that what comes next begins on a nexwline. I don't want skip blanck line in the source I'd like ...
50
votes
3answers
1k views

LaTeX3-sensitive editors

I'm starting to embed LaTeX3 code in my custom classes and packages -- and enjoying it more the further I learn about it --, but at least to me it would make for an even better experience if, as it is ...
4
votes
1answer
569 views

Package xparse continues to throw “Support package l3kernel too old”

I tried to compile a (flawlessly working) LaTeX document on a different computer, and suddenly was faced with the above error message printed by the xparse package (after that, many errors follow). ...
5
votes
3answers
125 views

Create tabular depending on counter

I want to create a tabular with i+2 many columns where i is a counter. The tabular should have the following layout: ------------------------------- | 1 | 2 | ... | i | foo | bar | ...
13
votes
2answers
633 views

Factorial (or, even better, binomial coefficient) function

Is there a function in l3fp for calculating factorials or, even better, binomial coefficients directly?
0
votes
0answers
51 views

LaTeX3 Problem Loading “xparse”

I am trying to use the code for dimensions from this post: Dimension of a Technical Drawing in Tikz However, xparse will not load with the new LaTeX3 updates. I get the following errors: Missing ...
32
votes
3answers
2k views

Always use \NewDocumentCommand instead of \newcommand?

Are there compelling reasons to stick with \newcommand or should one always use \NewDocumentCommand instead, even when not using any of the additional features offered by xparse? In addition and more ...
14
votes
3answers
1k views

How to change operator symbols in truth table

I need to type truth tables for my computer architecture classes. Until now I was using a manually typed tabular but today I've found this answer from Scott H. which provides a command called ...
0
votes
0answers
22 views

XeLaTeX with fontspec gives “Undefined control sequence” error after MiKTeX update [duplicate]

I updated MiKTeX this morning and now I can't get XeLaTeX with fontspec to compile at all. It throws an "undefined control sequence" error for \sys_if_engine_luatex:T A minimum working example is: ...
1
vote
1answer
115 views

Expandability: LaTeX3 VS LaTeX

The expandability is the heart of macros/functions. I wonder to know: If a better understanding of expandability in LaTeX3 can only be through a good background of expandability in LaTeX. How far ...
28
votes
5answers
1k views

Reducing fractions automatically using LaTeX 3

Consider the following code: \documentclass{article} \begin{document} \noindent Can I make \LaTeX{} reduce a fraction automatically?\\[\baselineskip] For example, I would like the fraction \[ ...
9
votes
1answer
148 views

Where are the sources for LaTeX3 development in TeX Live?

I'd like to take a look at the sources for some of the LaTeX3 development to model after, but I'm having trouble finding them. Where might I find the sources for texdoc interface3, texdoc xparse, and ...
2
votes
0answers
65 views

How to sort a comma separated list?

Using receipt of How to process a comma separated list?, I elaborated the following code for my needs: \ExplSyntaxOn %\seq_new:N \l_input_seq % declare a list (seq) variable \cs_if_exist:NTF ...
8
votes
1answer
74 views

Does expl3 key-setting syntax have an equivalent of TikZ/PGF's .cd?

This question has the following form: 'I know how to do X using Y. I can also do X using Z but not so elegantly as using Y. Can I do X using Z in the same way that I can do X using Y, for a more ...
3
votes
2answers
56 views

Creating a command that builds a 1 dimensional diagram from tokens

This question is indeed very similar to Creating a command that concatenates an input string token by token, but the solution probably looks different and I have difficulties reading up on the ...
7
votes
1answer
121 views

LaTeX3 best practice: using newed commands within package code

I'm quite new to LaTeX programming and currently looking into LaTeX3 and how to write a small ExplClass. This class should provide an allcaps command that I defined as follows: ...
17
votes
2answers
197 views

How to \let an xparse defined command?

Let \example be an xparse defined command, which takes one optional and one mandatory argument. The definition of \example cannot be modified (e.g. because it comes from a third-party package). The ...
5
votes
2answers
75 views

Build table in new command results in too long vertical lines

I am trying to build a table inside a LaTeX 3 command. A MWE: \documentclass{article} \usepackage{xparse} \ExplSyntaxOn \NewDocumentCommand{\createTable}{ m m }{ \begin{tabular}{|c*{#2}{|c}|} ...
1
vote
1answer
29 views

Detecting empty key values when key is provided

I believe I am looking for a LaTeX3 type syntax solution to more appropriately detect a missing argument. To me I would have expected key={} to be a valueless, blank, or empty argument key. After ...
0
votes
1answer
57 views

How to stop indentation of new paragraph in tufte-handout? [duplicate]

I'm using the tufte-handoutclass, but I want to deviate slightly from the template. I would like to separate paragraphs through a small space, not through indentation. I usually do this in my Latex ...
3
votes
1answer
55 views

LaTeX3 loop expanding to repeated {}s

I’m using the ExPex package for vertically aligned linguistics glosses. For various reasons I have some stuff that looks like this: \ex \begingl \gla \rlap{thisisaverylongword} @ {} @ {} @ {} @ ...
9
votes
2answers
232 views

Workaround how to use expl3 functionality in tikz

What I want to do I want to create a command \planfigur{<edges>}{<angles>} which draws a triangle using TikZ. \planfigur should have 2 mandatory arguments, which let me specify edges ...
3
votes
2answers
161 views

How to make marginratio from geometry package work also with LaTeX3?

With LaTeX2e, the marginratio key provided by geometry package can be used safely: \documentclass{book} \usepackage{geometry} \usepackage{calc} \newlength{\mylayoutwidth} \newlength{\mylayoutheight} ...
19
votes
2answers
692 views

Write new package with LaTeX2e or LaTeX3

I’m planning to create a package and I wonder if it’s better do do this with LaTeX3 syntax or the „old“ LaTeX2e, which is the one I know. Will LaTeX2e packages be supported by LaTeX3? I can give ...
22
votes
5answers
2k views

What is missing in LaTeX?

I have been reading this article and started to think about the position of LaTeX amongst the current competitors. Currently, I am using it (or XeTeX) even for ‘casual writing’ and sometimes I spend ...
7
votes
1answer
171 views

Is a graphical document author/designer interface realizable with LaTeX3?

With the separation of document authorship, design, and implementation, is a graphical tool for the end-user within reach? LyX tries to do this today, but LaTeX2e is not well-designed for such an ...
1
vote
1answer
171 views

Will TeX become mainstream one day? [closed]

I remember starting LaTeX when I was in the last year of my undergraduate studies .I was fascinated by a book in Industrial Organisation, partly because it was a good book per se, but also because I ...
51
votes
3answers
23k views

Difference between LaTeX, LaTeX2e, LaTeX3 ?

I was wondering, what is the difference between LaTeX, LaTeX2e and LaTeX3. Are the 2 higher versions available for use? I use LaTeX. How can I use the other 2 on Windows 7?
11
votes
1answer
206 views

Penalty-enhanced approach to float placement in LaTeX3

This question is quite related to Penalty-enhanced approach to float placement, but here I am focusing on the situation for LaTeX3. The LaTeX2e float placement algorithm does not look backward ...
10
votes
2answers
163 views

Misunderstanding from l3keys documentation

Based on the interface3 documentation and a nice article in TUGboat, Volume 31 (2010), No. 1 called Programming key–value in expl3 by Joseph Wright, I have been trying to put together a MWE that will ...
5
votes
1answer
80 views

Is \int_step_inline:nnnn inserting something after it finished?

The following snippet \RequirePackage{xparse} \documentclass{article} \usepackage{tabu} \ExplSyntaxOn \NewDocumentCommand\trop{}{ \int_step_inline:nnnn{0}{1}{3}{ a & b & c & ...
1
vote
2answers
105 views

How can I use a LaTeX3 variable as a path in includegraphics (solving the expansion problem)?

This problem is driving me nuts. I'd like to change the includegraphics path depending on some conditions. It seems simple, right? I already read the answers to this question: Passing image path to ...
10
votes
1answer
198 views

Forthcoming LaTeX3 User Manual

I read very recently that Frank Mittelbach has a Latex3 user manual/developer's reference (not sure which) in the pipeline - in fact its said "... only 250 days to go!". Unfortunately now I cannot ...
2
votes
0answers
156 views

How can I migrate commands and environments from LaTeX2e to LaTeX3? [XeTeX]

Sometimes forcing consistency makes things much easier to maintain. The motto "keep it simple" comes to mind. xparse offers the most bang for your buck when it comes to defining commands with various ...
9
votes
1answer
687 views

\pdfstrcmp or \strcmp in pure TeX

I'm trying to get LaTeX3 working with an old e-TeX kernel, and it fails due to the lack of \pdfstrcmp (or XeTeX's \strcmp equivalent). Is there a pure TeX definition of \pdfstrcmp that I could insert ...
7
votes
1answer
111 views

Has LaTeX3 syntax possibly changed since this question was last answered

I am adapting the LaTeX3 answer in this question: http://tex.stackexchange.com/a/61603 But I can't get the original MWE answer to compile using xelatex. I have renamed the variables, but the error ...
2
votes
0answers
47 views

Access xparse's \BooleanTrue via latex3 expl3

I'm implementing a command with xparse's boolean token processing \NewDocumentCommand{\op}{s o t' t. t^ g}{ % Here I need to check for % (#3 || #4 || #5) && !(#3 && #4 ...
7
votes
2answers
103 views

how to space after LaTeX3 commands

I am trying to define a message that includes a computed number. \RequirePackage{expl3} \ExplSyntaxOn \int_set:Nn \l_tmpa_int { 42 } \msg_new:nnn { package } { message } { The~number~ \int_use:N ...
2
votes
1answer
111 views

Combine code from two LaTeX 3 answers

I'n trying to combine the code from the answers "Sum of finite series using LaTeX 3" and "Reducing fraction using LaTeX 3" to automatically calculate a finite sum as either the numerator or ...
10
votes
1answer
143 views

Translate \typeout to LaTeX3

The command \typeout{argument} expands its argument and writes the result to the log and the terminal. Writing l3build tests, I sought for an equivalent command in LaTeX3, but only found \iow_log:x ...
5
votes
1answer
98 views

How can the knots TikZ library be used with current l3 (e.g. TeX Live 2015)?

The knots library for TikZ seems to be incompatible with the current l3 packages as provided, for example, by TeX Live 2015. The following example, taken from the library's documentation compiles ...
5
votes
2answers
268 views

Splitting delimited token list argument

I wrote a little piece of code (function \getfirst:w) that splits its delimited argument at the first embedded :. The code works well if used standalone, but I am unable to place it into the .code:n ...
4
votes
3answers
118 views

Define control sequences in terms of control sequences

I want to set up aliases for changing control sequences using composed control sequence names. Here is an example. \documentclass{standalone} \usepackage{expl3} \ExplSyntaxOn \cs_new:Npn \name { ...
16
votes
1answer
257 views

Patching commands in LaTeX3

Is there some facility in the LaTeX3 kernel to modify existing commands like etoolbox's \preto \appto and \patchcmd do?
1
vote
0answers
45 views

LaTeX3 \clist_sort:Nn — How has this function been implemented?

I have recently read in the documentation of package l3sort about the usage of \clist_sort:Nn to sort lists. I would like to know how and where \clist_sort:Nn has been implemented. In l3sort.dtx I ...
6
votes
2answers
48 views

Why can you not skip lines in document when providing optional environment parameters with xparse?

Is it intentional that you cannot skip lines when using optional environment parameters with LaTeX3's xparse? It seems that you can skip lines with mandatory parameters. Compare ...
1
vote
0answers
211 views

PDF file size massive in MikTex [closed]

I did my thesis in Latex/Linux using raw gs commands and managed to produce the whole 150page monster within a few megabytes. For brevity I've decided, some 10 years on, to use Miktex under windows ...
4
votes
2answers
78 views

Writing a token list conditional with expl3

This is a follow-up question to LaTeX3 conditional with grouping fails to compile. I would like to write a token list conditional with expl3 that is fully expandable in order to use it as a predicate ...