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36

Merry Christmas! The syntax is \textwheel{string}{inner_color}{outer_color}{reps}{fade_length} where reps is the number of repetitions, and fade_length is the length over which the fade from the inner to outer color occurs (upon a recent EDIT, it can now be smaller or larger than the string length and work appropriately). If set to 0pt, it sets the ...

21

The main loop for comma separated lists in LaTeX3 is \clist_map_inline:nn The first argument is an explicit list, the second argument tells LaTeX what to do with each item. For instance, we want to print an enumerate environment from the items: \documentclass{article} \usepackage{xparse} \ExplSyntaxOn \NewDocumentCommand{\makeenumerate}{ m } { ...

12

There is a package lambda-lists by Alan Jeffrey for "Lists in TeX's mouth". Here's an example in plain TeX: \catcode@=11 \input lambda.sty \catcode@=12 \tracingmacros=1 % check out the log file afterwards! \def\mylist{\Listize[1, 2 ,3,,4=foo,5,]} \def\myfun#1{do something with #1\def\foo{}} \def\fooDefined?{\ifdefined\foo foo's defined\else foo's ...

12

With LuaTeX you can use the script language Lua: \documentclass{article} \usepackage{luacode} \begin{luacode} function permute(n) local tab = {} for i = 1, n do tab[i] = i end for i = 1, n do local j = math.random(i, n) tab[i], tab[j] = tab[j], tab[i] end for i = 1, n do tex.print("\\shortstack{"..i.."\\\\"..tostring(tab[i]).."} ") ...

11

The etoolbox package provides some list processing tools. For comma-separated lists there are \docsvlist{<list>} where each item is put in the input stream with \do{<item>}. This means a suitable definition of \do has to be provided. \forcsvlist{<handler>}{<list>} where each item is put in the input stream as argument to ...

11

Package kvsetkeys Package kvsetkeys provides parsers for key value lists and comma separated lists. Many formats are supported: LaTeX, plain TeX, it works even with iniTeX. Syntax: \comma@parse{⟨comma separated list⟩}{⟨code/processor with one argument⟩} Example The example is given for iniTeX to show the minimal requirements of the package. % Setup ...

10

This is using the under-development tabstackengine package, first introduced here at Writing a table with equally spaced columns, based on the widest column (source code available at Measuring align). The package extends the stackengine package by adding tabbing capability. This answer, Can I tab inside of align environment?, gives some of the syntax of ...

10

You can count how many elements there are in one of the arrays and use that number as the foreach limit. Then every spin accesses one element of the arrays; \documentclass[tikz]{standalone} \def\firstlist{{0,1,2}} % <== Notice the double brace for array notation \def\secondlist{{0,1,2}} \newcommand{\testa}{ \pgfmathdim{\firstlist}%Get the number of ...

10

Here is a very simple solution: \documentclass{article} \usepackage{tikz} \def\firstlist{0,1,2} \def\secondlist{0,1,2} \newcommand{\testa}{ \foreach \x [count=\c,evaluate=\c as \y using {{\secondlist}[\c-1]}] in \firstlist { \draw(0,\x)--(1,\y); } } \begin{document} \begin{tikzpicture} \testa \end{tikzpicture} \end{document} An extended ...

9

I'm not so sure you want to do it. ;-) \documentclass{article} \usepackage{xparse} \def\xforeach#1#{\xforeachaux{#1}} \ExplSyntaxOn \NewDocumentCommand{\xforeachaux}{mm} { \carlitos_xforeach:nn { #1 } { #2 } } \seq_new:N \l_carlitos_xf_first_seq \seq_new:N \l_carlitos_xf_second_seq \seq_new:N \l_carlitos_xf_list_seq \cs_new_protected:Npn ...

9

A classical implementation allowing also exponents: \documentclass{article} \makeatletter \newcommand{\env}[1]{% \sigma \expandafter\startm@keprimes\expandafter{\romannumeral#1000@}% } \def\startm@keprimes#1{\m@keprimes{}#1} \def\m@keprimes#1#2{% \if#2@% \expandafter\@firstoftwo \else \expandafter\@secondoftwo \fi {#1}% ...

9

Fireworks, in any flavor of TeX, but only text? Then the old package happy4th meets the requirements. Really is only an little obfuscated TeX file: % Author: Brian Blackmore <blb8@po.cwru.edu> % Date: July 4, 2007 % Version: 20120102 % Original source: efnet #TeX % License: Public Domain % Requirements: Plain TeX % \nopagenumbers ...

9

I think the problem arises because when the sprial changes direction two squares are drawn at each corner. For example, if the spiral is moving right, when the x < x_max condition is not met the direction is changed but the y coordinate is not moved up so the next square is drawn in the same place as the last square. I've corrected this in the code below ...

9

Use it without a second member (which would denote the step): \documentclass{article} \usepackage{tikz}% http://ctan.org/pkg/tikz \newcommand{\boucle}[1]{\foreach \x in {1,...,#1} {\x }} \begin{document} From 1 to 5 : \boucle{5} From 1 to 2 : \boucle{2} From 1 to 1 : \boucle{1} \end{document} The same result could be achieved using multido: ...

9

Using egreg's template for straight LaTeX \documentclass{article} \makeatletter \newcommand{\makeenumerate}[2][,]{\begin{enumerate}% \def\dolist##1{\expandafter\@dolist##1#1\@eol}% \def\@dolist##1#1##2\@eol{% \begingroup\setbox0=\hbox{##1\unskip}\ifdim\wd0=0pt\endgroup\else\endgroup\item \fbox{\ignorespaces##1\unskip}\fi% ...

8

I'd suggest you to switch to the more versatile algorithmicx package; using the noend option, you can achieve what you want: \documentclass{article} \usepackage[noend]{algcompatible} \begin{document} \begin{algorithmic} \IF{condition} \IF{another condition} \STATE do something \STATE do something else \ELSE ...

8


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When using xpatch (or the original commands in etoolbox) for patching macros, it's recommended to use the builtin diagnostics, that is \tracingpatches and the “fail” argument. If you add \tracingpatches to the preamble, before your usage of \IfPackageLoaded, you'll get the message [debug] tracing \pretocmd on input line 26 [debug] analyzing ...

8

The usual approach to grabbing tokens with a delimiter in TeX would be something like \catcode\@=11 % \def\grabargs#1#2#3{% \def\grabargs@aux##1#2{% \ifx\relax##1\relax% \else #3{##1}\par \expandafter\grabargs@aux \fi }% \grabargs@aux#1#2\relax#2 } \def\print#1{{\tt #1}'} \catcode`\@=12 % \grabargs {Humpty Dumpty sat on a ...

8

Here's an implementation of the Knuth shuffle algorithm with expl3. \documentclass{article} \usepackage{amsmath,xparse} \input{random} \ExplSyntaxOn \cs_new_eq:NN \knuthshuffle_get_random:Nnn \setrannum \tl_new:N \l_knuthshuffle_tempa_tl \tl_new:N \l_knuthshuffle_tempb_tl \int_new:N \l_knuthshuffle_random_int \prop_new:N \l_knuthshuffle_newperm_prop ...

8

Although using multiple \foreach loops does make the "semantic" layout of the network a little unclear, it certainly makes its creation easier. I have taken some liberties with the required connections otherwise the network starts to look a bit cluttered. \documentclass[tikz,border=5]{standalone} \usetikzlibrary{arrows.meta,calc} \begin{document} ...

8

There are various ways to accomplish your needs. \documentclass[11pt]{article} \usepackage{xparse} % for D % for A, B, C \newcounter{mycount} \makeatletter \newcommand\repeatstringA[2]{% \setcounter{mycount}{#1}% \ifnum\themycount>0 #2% \addtocounter{mycount}{-1}% \expandafter\@firstofone \else \expandafter\@gobble \fi ...

7

Repetition via \romannumeral trick The number is multiplied with 1000 to convert it to a roman number. Then TeX produces a long string consisting of letter m, whose length is the original number. Then \repeatstringX looks at the next token, if it is an m, then the string unit is output. Otherwise the next token is the end marker F and the loop stops. ...

7

An implementation with expl3; the complete list is generated, so relieving PGF from the burden of doing the work by itself. \documentclass{article} \usepackage{xparse,tikz} \ExplSyntaxOn \NewDocumentCommand{\mpfor}{mm} {% #1 = variable, #2 = keys \cfr_mpfor:nn { #1 } { #2 } } \keys_define:nn { cfr/mpfor } { start .fp_set:N = \l_cfr_mpfor_start_fp, ...

7

The page builder is asynchronous and TeX doesn't have any clue where a page ends when typesetting a paragraph. Only when a paragraph has ended page breaking decisions are made. My strategy is to build the gigantic paragraph in a box that's then compared to the desired text height. If it's still below it, a new box is prepared with more repetitions. When we ...

7

You could always "roll your own" solution, but it would require considerable work to make it look as nice as \foreach: \documentclass[tikz,border=5]{standalone} \makeatletter \def\attxt{@} \long\def\frch#1#2#3{\long\def\frchaction##1##2{#3}% \def\lsta{}\def\lstb{}% \edef\lst{#1,@,/#2,@,}\expandafter\@frch\lst\@} \def\@frch#1,#2/#3,#4\@{% ...

7

There are a number of possible approaches to doing this without the complexity: I'll cover a couple using expl3. First, if you don't mind keeping things non-expandable then you could do something like \documentclass{article} \usepackage{expl3} \ExplSyntaxOn \cs_new_protected:Npn \For #1#2#3#4 { \int_step_inline:nnnn {#1} {#2} {#3 - 1} {#4} } ...

7

You have to use a \protected@xdef: The first parameter of \coljoin as defined below can be used to pass in the macro that needs to be executed for each entry. It defaults to just passing the cell data thru without any additional processing. References: How do I use the ampersand (&) inside a foreach or conditional (or other group/environment) when ...

7

Remove the second item. \documentclass[preview,border=12pt,varwidth]{standalone} \usepackage{pgffor} \newcommand{\boucle}[1]{% \foreach \x in {1,...,#1} {\x } } \begin{document} From 1 to 5 : \boucle{5} From 1 to 2 : \boucle{2} From 1 to 1 : \boucle{1} \end{document}

7

Since the cross-over point is one of the nodes of the hobby path, you can use the soft blank feature of the hobby package. This allows you to specify some parts of the path as being blank. It also allows you to save and reuse the path and switch the behaviour of the "soft blanks". \documentclass{article} %\url{http://tex.stackexchange.com/q/162919/86} ...

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