At a rough look through I found out that about 90% of all pgfplotstable-questions are due to me. :()

I suspect that the author will invite me to coffee at some point.

@cis 28 = 90% of 979 :-)

@DavidCarlisle :)

@yo' I tried some overleaf promotion:-) tex.stackexchange.com/questions/564112/…

@DavidCarlisle Thanks :) I'll note this down for our Product team, actually...

@JosephWright Can you sanity check this, always dangerous to tell people they won't lose work... github.com/learnlatex/learnlatex.github.io/issues/…

@DavidCarlisle Yes looks ok: no rebase so no risks

@DavidCarlisle There's always the reflog anyway, although that's a fallback really

@JosephWright thanks

@JosephWright incidentally I went for putting a comment about the update in all the issues rather than send an email as I didn't have email contacts for everyone.

@DavidCarlisle I'd seen :)

@JosephWright it's OK but doesn't really scale and we didn't have open issues for all translations (I used a closed issue and a PR comment for two of them) we need a better plan going forward but that worked OK for now, and hopefully a public prompt may move some of them on.

@DavidCarlisle Yes: I wonder how other projects handle this

@DavidCarlisle In other news, I've restored the docs for l3backend, so people can see all of the comments about how we worked out the undocumented features of each one

@JosephWright sounds good

@DavidCarlisle Which reminds me I need to hassle Frank about how to safely activate link breaking in dvips: I've got lots of PostScript but nowhere to use it :(

@DavidCarlisle Yes: the issue turns out to be l3docstrip! (Or rather how we have to set it up for l3backend) - I'll be pleased when everything is merged back together in DocStrip

@JosephWright I thought afterwards a better thing would have been to add that comment to the lesson-06 PR but @ ping all the translators in the comment to notify them rather than duplicating the comment to each translators issue.

@DavidCarlisle Ah yes

Developer: We have a problem.

Manager: Remember, there are no such things as problems, only opportunities.

Developer: Well then, we have a DDoS opportunity.

\newcommand\myMacro{%
	\begin{aligned}%
		&def%
	\end{aligned}%
}
\begin{frame}{Church and Curry Products}
	\begin{align*}
		\myMacro
	\end{align*}
\end{frame}

This throws ! Extra }, or forgotten $. <recently read> }

Unfortunately, I cannot reproduce this error in a MWE. (If you pack the above code in an otherwise empty Beamer document, it'll compile.)

But why does it fail in my document if and only if I invoke \myMacro there?

Also, if I remove the ampersand from the def. of \myMacro, it compiles fine.

@DavidCarlisle, @UlrikeFischer With color spaces more-or-less done, I think I'll look at the business about drawing colour and using the stack: with the new dvipdfmx feature and the tricks @DavidCarlisle worked out for dvips, I can arrange that all colour is done that way I hope

If I got a .vrb file that emerged from a fragile frame in Beamer

with contents

\frametitle{Church and Curry Products}\framesubtitle {}
	\begin{align*}
		\curryProdTheory{}
	\end{align*}

does that look alright?

I don't know what "! Missing } inserted." should mean there.

Also "! Misplaced alignment tab character &."

So the problems seems to be the ampersands in the macro

@ComFreek without a mwe, just a guess: try a fragile frame

I already have to no avail

@ComFreek the make a copy of your document and trim it down to a mwe

@DavidCarlisle is that because it expands to \ifnum1=11\else0\fi? Or it's a more subtle reason? @cis

% !TEX TS-program = latexmk -xelatex -shell-escape -silent -latexoption="-synctex=1" -f %
% !TEX encoding = UTF-8 Unicode

\documentclass{beamer}

\usepackage{amsmath}
\usepackage{mathtools}

\newcommand\myMacro{%
	\begin{aligned}%
		&def%
	\end{aligned}%
}

\begin{document}
	\begin{frame}[fragile]{My Frame}{}
		\begin{align*}
			\myMacro
		\end{align*}
	\end{frame}
\end{document}

@samcarter_is_at_topanswers.xyz Is that minimal enough? ;)

If I remove the \usepackage{mathtools}, it compiles fine.

@Rmano that

@ComFreek you can make it more minimal by removing \usepackage{amsmath}, beamer already loads this for you :)

% !TEX TS-program = latexmk -xelatex -shell-escape -silent -latexoption="-synctex=1" -f %
% !TEX encoding = UTF-8 Unicode

\documentclass{beamer}

\usepackage{mathtools}

\newcommand\myMacro{%
	\begin{aligned}%
		&test%
	\end{aligned}%
}

\begin{document}
	\begin{frame}
		\begin{align*}
			\myMacro
		\end{align*}
	\end{frame}
\end{document}

I guess this is the most minimal version now

@ComFreek You can fix it by using \usepackage[allowspaces]{mathtools}

(see page 4 of mathtools docu)

indeed

thank you very much!

Do you think this merits a Q&A for TeX.SE?

in case other people have the same issue

@DavidCarlisle Thanks

@ComFreek I don't think it is worth the effort to post on tex.se. If you look at the close queue of the previous weeks, there is one user who is serial closing beamer questions (while voting to keep open even the worst tikz posts), so a question would only be visible for a short time and future users with the same problem would still have no solutution

@samcarter_is_at_topanswers.xyz Really? That's not really on, I'll look at it

Hi all! Would this be an appropriate place to ask for comments on a package before I submit it to CTAN? :)

@meide You can always ask

see: github.com/mikkelee/latex-units

It's for typesetting weird old currencies & such. Would like comments on the internals (pitfalls, best practices, etc -- im still learning) & whether the documentation makes sense

docs still have some beauty errors (page breaks between commands & their description is the biggest one)

also the naming of macros/keys. some of them feel clumsy & id like to avoid changing them after it goes on CTAN

@meide at least the package's name should be correct in the docs :) Currently it says \usepackage[<options>]{unicode-alphabets}

haha whoops

@meide our resident rabbit is very good at spotting stuff :)

@PauloCereda 👍

@JosephWright As fast as lightning! ;-)

I'll check in later today (CET), but github issues are also welcome :)

How can I calculate +1 in Beamer?

I'd like to come up with:

\newcommand{\branch}[3]{\only<-#1>{#2}\only<(#1+1)->{#3}}

e.g. \branch{2}{a}{b} should result in \only<-2>{a}\only<3->{b}

^^^ which brick colour will tastes best?

lovely

yellow

@ComFreek why don't you use \alt?

@ComFreek You don't 'calculate', you use the normal relative syntax: you really don't want to be passing slide numbers at all

uh my 500+ lines document is scattered with slide numbers

and I already got annoyed at increasing them manually all the time upon changes

@ComFreek texdev.net/2014/01/17/the-beamer-slide-overlay-concept, texdev.net/2014/10/13/beamer-overlays-beyond-the-visible

@samcarter_is_at_topanswers.xyz blue(berry)

@yo' :D

\documentclass{beamer}
\begin{document}
\begin{frame}
  \alt<+->{After}{Before}\only<2>{After2}
\end{frame}
\end{document}

@JosephWright Thanks for the links!

Why doesn't this code show Before anywhere?

I guess I don't understand how \alt works

\temporal if you need 3 cases

\temporal<⟨overlay specification⟩>{⟨before slide text⟩}{⟨default text⟩}{⟨after slide text⟩}

I just need two

say on slides 1,2,3 it should be "before", after that "after"

how would that look like?

@JosephWright can we have a faq somewhere about the mismatch error?

@ComFreek ` \alt<4->{After}{Before}`

\alt<+->{After}{Before}
	\only<2>{Some more}

That gives me slides with "After" and "After, Some more", respectively

I am confused.

@ComFreek if you use relative overlays, it will depend on which overlay you are before that. If you use that first thing in a slide, you will get the after stuff

\alt<2->{After}{Before} works as intended

Yeah, I used it as the first thing, hence thought that the "current counter" is 1

hence "+-" is equivalent to "2-"

\alt<+(1)->{After}{Before} works

Hello! Just to make sure: Is it correct that only for tokens which are macros the sequence "->" is part of what is delivered by `\meaning'?

@DavidCarlisle should links be language specific on learnlatex? So, should I use [nächste Einheit](de/lesson-02) or [nächste Einheit](lesson-02) in the German translation?

Greetings all. I'm just observing, as usual.

@Skillmonlikestopanswers.xyz they are local so without the de/

^^^ back home from Venice

@UlrichDiez yes including active characters that are macros

@UlrikeFischer ooh

@LaTeXereXeTaL 'ello

@PauloCereda Hello!

:D

@Skillmonlikestopanswers.xyz this is an in-text link, not the "next lesson" link added at the end of the page automatically?

@PauloCereda you are supposed to use ollo to palindromic visitors

@DavidCarlisle ooh

A TOYOTA

Oh my, this is a palindrome

@UlrikeFischer Nice to see that the bearwear collection is available in Italy :)

@DavidCarlisle Thanks.

@PauloCereda that's why they have 4 wheel drive

@DavidCarlisle correct.

@DavidCarlisle and thanks :)

@DavidCarlisle ooh

@Skillmonlikestopanswers.xyz I was just showing off my linguistic ability that I knew what the funny dotted text string meant.

@DavidCarlisle Just stumbled upon it: In more-01.md the title should be "The Art of Computer Programming“ (missing "The")

@DavidCarlisle (not sure whether that's still a valid error, I just noticed that I didn't pull in a while)

@Skillmonlikestopanswers.xyz looks like all translators fixed it but the english one has The outside the quote:

$ grep 'Art of' */more-01.md
en/more-01.md:well known for a series of books called the “Art of Computer Programming”
fr/more-01.md:_The Art of Computer Programming_ (« L'Art de la programmation », surnommés
pt/more-01.md:Knuth é conhecido pela série de livros chamada "The Art of Computer Programming"
vi/more-01.md:Donald Knuth. Knuth được biết đến là tác giả của bộ sách "The Art of Computer

@DavidCarlisle :)

@DavidCarlisle it just looks a bit strange with the abbreviation behind it.

@samcarter_is_at_topanswers.xyz nice that ducks can now hug ...

$ git commit -m "The Art"
[master d5555c1] The Art
 1 file changed, 1 insertion(+), 1 deletion(-)

@Skillmonlikestopanswers.xyz ^

@DavidCarlisle :)

@DavidCarlisle "It's the Arts" ;-)

@DavidCarlisle hmmm

I'm fascinated with the attention ducks get here.

@LaTeXereXeTaL quack

@UlrikeFischer As we humans are struggling with the pandemic, the ducks have to do all the hugging :)

@samcarter_is_at_topanswers.xyz ooooh ;-)

The new syntax highlighting on TeX.SE looks really meh, or is this just me who doesn't like it?

@UlrikeFischer Here is also one for you:

\documentclass{standalone}
\usepackage{tikzducks,tikzlings}

\begin{document}

\begin{tikzpicture}
	\duck[]
%  \bear[scale=0.7,xshift=1.3cm,back]
  \node at (0.8,0.6) {\includegraphics[width=1cm]{photo-ulrike}};
  \duck[invisible,wing,yscale=-1,scale=0.8,yshift=-1.7cm,xshift=-0.2cm]
  \duck[invisible,wing,yscale=-1,xscale=-1,scale=0.8,yshift=-1.3cm,xshift=-2.5cm]
\end{tikzpicture}

\end{document}

@Skillmonlikestopanswers.xyz ... also has a lot of glitches

Is there some easy way to see, in case of an error/traceback during compilation from a Lua file, where the Lua file is being referenced from? At least the current version of LuaTeX that I'm using doesn't obviously give this information.

@samcarter_is_at_topanswers.xyz yes, some macros aren't highlighted for no apparent reason.

@Skillmonlikestopanswers.xyz the zebra striped \\\\\ are also funny

Okay this is going to sound rather silly, but here goes. I have been under the (terribly wrong) impression that LuaLaTeX required learning an entirely new language (Lua). It doesn't. It's a LaTeX engine that processes LaTeX.

I'm sitting here composing mathematical expressions with unicode characters. I get it now. I'm just sorry it took me so long.

@samcarter_is_at_topanswers.xyz awww

@LaTeXereXeTaL Rather the other way round: you can more or less use all normal latex things, but if you happen to know lua, you can do a lot more

@PauloCereda :D

@samcarter_is_at_topanswers.xyz Yes! I completely see that now.

@Skillmonlikestopanswers.xyz on the other hand, there are languages which were hit much worse than latex. I just read an rmarkdown Q and at first thought the highlighting did not work at all. At closer inspection it is dark blue mixed with black :)

@LaTeXereXeTaL don't encourage them.

@DavidCarlisle quack

@Skillmonlikestopanswers.xyz it doesn't know @ is a letter so any command with @ get half coloured, I assume the protocol is to raise a bug at highlight.js

@PauloCereda dinner

@DavidCarlisle oh no

@DavidCarlisle I'm just watching the ducks. quack

@samcarter_is_at_topanswers.xyz ^^^

@LaTeXereXeTaL ooh

@LaTeXereXeTaL s/watching/eating/g

@UlrikeFischer ooh

@DavidCarlisle you are mean

@DavidCarlisle Sounds like \makeatletter is missing :)

@UlrikeFischer yeah!

@LaTeXereXeTaL Will you throw some bread crumbs?

@PauloCereda you got the wrong person

@DavidCarlisle ooh we need a list of these mentions

Always. I grew up near a duck pond where my father would take me to feed the ducks and geese.

Barbara once told me bread is not good for us ducks :)

@PauloCereda Auntie BBC said bread is OK as long as you also eat other things

@samcarter_is_at_topanswers.xyz ooh bread and Nutella

@PauloCereda That's OK, just don't put it on pizza

@PauloCereda no break and duck is OK

@samcarter_is_at_topanswers.xyz ooh Nutella pizza is good

@DavidCarlisle oh no

@samcarter_is_at_topanswers.xyz see footnote #2 of the TeXplate documentation (texdoc texplate). :)

@samcarter_is_at_topanswers.xyz highlight.js seems to have a lot of issues open since they started using it here two latex ones github.com/highlightjs/highlight.js/…

@PauloCereda :) one has to use this just for the entertainment value

@samcarter_is_at_topanswers.xyz sounds like the last paragraph of my thesis acknowledgments. :)

<markm> c++: the power, elegance and simplicity of a hand grenade

[paulo@cambridge ~] $

@DavidCarlisle there might be a correlation with a sudden increase in user numbers :)

@DavidCarlisle there is also a meta question.

@UlrikeFischer I braved a miktex comment tex.stackexchange.com/questions/564218/…

@DavidCarlisle we just said the same ;-)

@UlrikeFischer yes but I spoke from ignorance

@JosephWright I looked at the iccbased stuff in colorspace. Basically it creates a stream object from an icc, it maps DefaultRGB in the ColorSpace resource to this profile. It doesn't handle outputintents. It is not difficult, but I'm not quite sure where it belongs. From the topic it is color related, but most of the code is l3pdf/pdfresource stuff.

@JosephWright Can I run BibTeX with l3build check? Or should I have a pre-built .bbl file?