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12:19 AM
@Sebastiano You linked to marmot's "shadow" post which seems completely unrelated, but no matter.
 
12:31 AM
@Sebastiano In support of @DavidCarlisle (something that does not seem to happen too often ;-) I would like to add that it makes perfect sense to ask in the chat for reopening votes for questions by others. Whether it is appropriate to ask for reopening votes of your own posts, I am not so sure. It sounds a little bit like jumping the line in the supermarket (if you know what I mean).
2
 
12:44 AM
@UlrikeFischer @marmot @PauloCereda The Christmas Extravaganza was mentioned in the TUG newsletter!
 
@samcarter Oh, good! The newsletter starts to grow up! ;-)
 
1:25 AM
Is it possible to plot this function using TikZ/PFGPlots and tikzpicture environment?:
4
Q: I want to plot the integral of sin(x^2) in pgfplots

Hankyboyi want to plot the integral of y=sin(x^2) in pgfplots but dont know what to put inside the ''{ }''. This is because its a prety hard function to integrate. Can someone help me!

I did not say anything, sorry
 
1:44 AM
@manooooh Do you have this question yourself or do you just want to remind us that, whenever there is a question asking how one can do something with TikZ or pgfplots, there are certain attempts to provide answers which use everything but TikZ or pgfplots and quickly close the question? ;-)
@manooooh Yes, this is really interesting. This question got closed as being a duplicate of a question which asked how to draw this with TikZ (and not pgfplots). And yes, if you look through the answers, you will indeed find one answer which uses pgfplots to some extent. Really really strange IMHO.
But I do not think that you can use pgfplots to solve differential equations without further ado, but it is not clear to me if that is really what is being asked in the question.
 
2:25 AM
@marmot haha.. I prefer not to answer that question...
@marmot oh yes, strange!!
Then I say "sorry" because I realized that the integral I am looking for does not say anything about the constant of integration, so, if we graph the indefinite integral where C=0 then it could be wrong; we should plot the infinite functions. So I take the decision to not plot it
But thank you for your concern!
 
@manooooh Mathematica claims the integral is (x - cos(x)*sin(x))/2 up to the constant. (Usually you get rid of the constant by specifying the lower bound of integration.)
 
3:26 AM
@marmot be careful! The integrand is sin(x^2), not sin^2(x) 😂. This is an indefinite integral, like the question, not a definite integral
 
 
1 hour later…
4:37 AM
@manooooh Sorry. Even simpler. ;-) sqrt(pi/2)*FresnelS(sqrt(2/pi)*x). Just kidding!
Anybody who is using a Mac and able to confirm this issue: could you perhaps consider helping to reopen the question?
 
 
1 hour later…
5:48 AM
@marmot XDDD
Now I know why you end up with learning Physics instead of Maths... :P
 
6:23 AM
@HenriMenke Because before asking for the reopening of a question, I prefer to know the reasons that led you to propose its closure. I don't find them relevant because your reasons are related to subjective questions, which my question is not. And moreover, I don't understand why people blame a question for being off-site resource. Nevertheless, since you are pleased to close this question, I do not upset you by asking for it to be reopened.
 
6:47 AM
@AndréC I'm not the one that has to be pleased, the community as a whole has to. If you vote to reopen and enough other users find that the questions should be reopened, then so it is.
 
6:58 AM
@marmot Does adding \directlua{pgf.gd.lib.random = math.random} after \usepackage[compat=1.1.0]{tikz-feynman} fix the problem?
 
@HenriMenke I am afraid it does not. The output does not change when I add this line.
 
@marmot Found the problem. Linux and Mac OS are generating different sequences of random numbers and tikz-feynman is using the spring layout which is force-based and uses a random configuration.
print(status.banner)
print(_VERSION)
math.randomseed(42)
for i = 0, 10 do
    print(math.random())
end
Execute this on Linux and Mac OS.
 
@HenriMenke Stupid question: how should I execute this? It does not look like a standard shell script.
 
7:13 AM
@marmot luatex --luaonly test.lua
@marmot But I just posted a screenshot. There is a university computer running Mac OS and MacTeX which I could access.
@marmot You can use any solution from here to get predictable random numbers
vvvvvvvvvvvvvvvv
19
Q: TikZ graphdrawing differences between LuaTeX versions

Henri MenkeWhat I will describe below is not yet a problem but will appear when TeX Live 2019 is released and LuaTeX will be upgraded to 1.09. MikTeX users might already experience this issue. When I typeset one of the graphdrawing examples from the TikZ manual, it appears mirrored between the LuaTeX ve...

 
@HenriMenke Yes, I confirm this.
@HenriMenke I guess you might want to answer the question. It is open again. (I also just realized that luatex survived my attempts to wipe out an older TeX installation. Otherwise I do no have any issues with the latex compilers.)
@HenriMenke Thanks for doing all this!
 
@marmot I was discussing with Christian Feuersänger, whether we should ship the RNG with TikZ, to ensure deterministic random numbers. He voted for yes, I for no.
@marmot BTW, this issue must have been there since the beginning. Why did nobody notice earlier?
 
@HenriMenke I have no opinion because I do not know what RNG is. (It is amazing what Christian achieved. Nevertheless LaTeX is not a computer algebra system.)
 
@marmot RNG = random number generator, specifically the one I present in the section “Implementation of glibc's rand() in pure Lua” in my answer to question linked above.
 
@HenriMenke I do not know. I guess that the sad truth is that the graph drawing library does not have really the tools to generate fantastic layouts of Feynman diagrams. In most situations it is better to draw the graphs without these algorithms, at least this is how I feel about it.
@HenriMenke And as you know arXiv does not run lualatex either so I guess that the graph drawing part of the package is not heavily used.
 
7:26 AM
@marmot I have never used graphdrawing apart from some answers on TeX.SX. The force-based algorithms (spring layout and spring electrical layout) are especially fragile, because they use random numbers.
@marmot Yes, that's really annoying. I wonder whether one could convince the people from Cornell to offer LuaTeX.
 
@HenriMenke Yes, I am happy to believe this. (BTW, I have created a slight variant of your nice path extrema answer.) I know some people from Cornell, but not those who run the show. Need to go hibernating now.
 
@marmot I started writing an answer but noticed that I'm essentially duplicating this answer, so I voted to close as duplicate instead.
 
8:27 AM
@DavidCarlisle ^^ don't you like the arara manual? It's so friendly. :)
 
8:40 AM
@PauloCereda you should add at the end, "If in doubt blame Paulo Cereda, as it's probably his fault"
 
@DavidCarlisle They do it regardless. :)
 
@HenriMenke (wasn't that a difference in Lua versions rather than a difference in OS, I saw something about Lua changing its RNG before) you could use the pdftex inspired RNG, we just got that into all the engines (including xetex and ptex) for tl2019 exactly to get consistent numbers in all implementaions.
@PauloCereda good!
 
@DavidCarlisle oh no
 
@HenriMenke on no you areusing 5.2 in both cases, that's bad:(
 
9:06 AM
@DavidCarlisle I'm not sure that I want to get involved in this random number chaos but on windows I get neither of Henris pictures and I remember a longer discussion where math.floor against math.round played a role in this feynman-stuff and lead to different outputs.
@DavidCarlisle the next tabu problem: tex.stackexchange.com/a/469309/2388 ;-(.
 
9:20 AM
@UlrikeFischer ctan/pkg/xtabu ?
 
@DavidCarlisle ooh zzztabu
 
@PauloCereda As you thought of the name, you are installed as maintainer and receiver of all bug reports. Thanks for offering.
 
@DavidCarlisle oh no
@DavidCarlisle "That's not a bug, it's a feature"
 
@PauloCereda another useful phrase you will need is "That's Frank's fault"
 
@DavidCarlisle I'm not sure. I never really liked tabu, I always had the impression it wants to do everything different (better) than the kernel and so created rather fragile code (as can be seen now). I would prefer to transport some of the ideas to array/longtable. Beside this this problem perhaps need an adjustment in array.
 
9:28 AM
@DavidCarlisle ooh
 
@UlrikeFischer nor me, but we broke it and so I think we should try to unbreak it somehow, if the maintainer can't be reached
 
@DavidCarlisle Frank is a nice bloke
@DavidCarlisle that means yet another GitHub organization taskforce thingy?
 
@PauloCereda simpler just to use github.com/cereda then it is clear where bug reports are going.
 
@DavidCarlisle oh no
 
@UlrikeFischer you have secret team mail that @PauloCereda can't see.
 
9:41 AM
@DavidCarlisle ooh a secret team mail
 
 
2 hours later…
11:16 AM
@UlrikeFischer just tried pdflatex tabu.dtx interesting outcome....
 
@DavidCarlisle nice ;-)
 
@UlrikeFischer Fortunately we can blame @PauloCereda
 
11:31 AM
@DavidCarlisle the \catcode164=14 is the problem. But I'm not sure I want to investigate why ;-). (But even without it it won't compile, some problem with zref).
 
@UlrikeFischer yes I did wonder if we had broken zref but then I saw there were so many other issues. I suggest we just wait for @PauloCereda to supply an arara rule to build the document.
@UlrikeFischer eek \catcode164=14 i means the file has to be stored in latin1, I wonder what encoding it is in, let me look...
 
@DavidCarlisle It is latin1, but the catcode setting is because of this here github.com/latex3/latex2e/issues/87.
 
@UlrikeFischer oh great:-)
 
@DavidCarlisle regarding the zref error (do you want to guess who is the author of enumitem-zref?).
\documentclass{article}
\usepackage{enumitem}
\usepackage{enumitem-zref}

\begin{document}
bub
\end{document}
 
what's he using globcount for:(
@UlrikeFischer then if you get past that you get the same error as in tabu.dtx with the comma list not being split up
\documentclass{article}
\usepackage{enumitem}
\let\globcount\newcount
\usepackage{enumitem-zref}

\begin{document}
bub
\end{document}
! Package zref Error: Property `zen@default,zen@page,zen@type,zen@depth,zen@lis
tctr,zen@listname,zen@index,zen@label,zen@ref,zen@starlabel,zen@parents,zen@ref
item,zen@commaref,zen@item,zen@currentlabel,zen@counter' does not exist.
 
11:47 AM
@DavidCarlisle yes I know (he is loading etex). So I would say this package is broken too. I do see a github organization lurking ...
@DavidCarlisle this is a rather simple bug in enumitem-zref: he uses \zref@addprop{zen@list}{..} instead of \zref@addprops{zen@list}{...} (plural s).
 
@UlrikeFischer but did that ever work?
 
@DavidCarlisle I don't know. But already in tl12 it doesn't work. So I doubt it ;-)
 
12:05 PM
% Between 2010/04/19 v2.13 and 2010/10/22 v2.19 a comma separated list
% of properties could be used as argument \meta{propname}.
% Since 2010/10/22 v2.19 the addition of several properties
% at once is supported by \cs{zref@addprops}.
@UlrikeFischer ^^
@UlrikeFischer so I guess he wrote this package in the summer of 2010:-)
 
@DavidCarlisle good detective work. ;-) And after the nice summer no one used the package?
 
 
1 hour later…
1:31 PM
I just tried to do the right thing and set up a Travis build for some updated old code and just can't get it to work :( Anyone want to be a guinea pig for me?
 
@WillRobertson Fire away
 
@JosephWright Thanks! Just to check my machine isn't wonky or my brain isn't fried, does this work for you?
git clone https://github.com/wspr/will2e.git
l3build check
(more like)
@JosephWright Of course it works for me on my Mac, but on Travis I get different results. I wouldn't think pdflastposy etc would be that fragile?
 
@WillRobertson Give me a few minutes
 
@JosephWright Of course :)
 
@WillRobertson Which package fails for you?
 
1:39 PM
@JosephWright Nothing fails except the actual output of the test!
@JosephWright If l3build check works for you, it must be something local to me...
 
@WillRobertson No, I get a failure for subdepth
 
@JosephWright Oops, I mean if it DOESN'T work for you, that confirms the problem is local to me ;)
 
@WillRobertson I get a failure here: shouldn't you test that the two values are the same, not the absolute values?
 
@JosephWright I was too lazy for that, but yes I should.
 
@WillRobertson Needs two passes I guess
 
1:43 PM
@JosephWright Nope, you can get the lastpos data at page shipout (although I did have to go back and check just then that's the case)
 
@WillRobertson Ah, yes, but still needs a test somewhere later
@WillRobertson I do wonder why it's not platform-stable
 
@JosephWright Yes, hence the difficulty with the test. I'm still not convinced it's a stability problem. But I am pretty stumped otherwise
Aha. I can't explain why but I may just have fixed the problem.
 
@WillRobertson ???
 
@JosephWright I think it's a very dumb and convoluted reason around not having the .ins file in version control somehow ?!
 
@WillRobertson Ah ... strange
 
1:50 PM
@JosephWright But thank you very much for trying it out to confirm it was indeed my fault!
@JosephWright Let's just say my brain hasn't fully re-engaged after the summer break...
 
@WillRobertson it must be confusing, having summer breaks in winter:-)
 
@DavidCarlisle most certainly!
 
2:26 PM
why doesn't travis know when i'm endlessly reloading the page that it should start a rebuild quick smart
 
@WillRobertson have you set the "auto cancel" option which means that it aborts anything in the queue if you commit, rather than sticking a new job at the end of the existing queue
 
@DavidCarlisle Apparently I have — I guess it's on by default? I'm really just complaining for the sake of it, it's not a big delay :)
 
2:52 PM
Bruno's idea to randomise the order of tests is genius
 
3:18 PM
Definitely, my falcon will hunt @marmot. Nevertheless, +1 For my tikizifying my Falcon!! I wish I could give more. Could you also suggest how to make teeth barrel shaped? — Raaja 6 mins ago
This sounds like a serious threat to @marmot! He should better hide in his burrow.
 
3:37 PM
@samcarter Will do. Wait! Today there will be basketball....
@WillRobertson I saw your nice Rio talk. Well, meanwhile we also got "blessed" with canvas but the IT won't allow me to use your tricks.... :-(
 
@marmot Basketball sounds safe enough, you can throw the ball at any approaching falcon
 
@samcarter It could be a trick by the falcons, though...
 
3:53 PM
@marmot Oh wow! I'm glad there was at least one person that found it relevant :)
@marmot Sorry to hear they've disabled the API. That's weird. Anyway, I find Canvas much better than Blackboard so I would still be happy to have made the move even without the API in place...
 
@WillRobertson We had EEE before, which is not great but worked. Canvas is worse IMHO. It is not great, very confusing and you have to do even more click-click-click.
 
@marmot I'm sorry to hear that. I haven't even heard of EEE!
 
@WillRobertson Lucky you. ;-)
 
4:48 PM
I really think we should optionally decouple l3build ctan from l3build check...
 
Bonjour André
 
@WillRobertson do you know how to create a rule with expl3? Is there a \hrule or something somewhere?
 
Bonjour Alex, comment allez-vous ?
 
@UlrikeFischer Not off the top of my head, sorry — this might not yet exist!
 
@UlrikeFischer you're not supposed to put ink on paper, just pass tokens around in interesting ways.
4
 
4:55 PM
Bien mercI, et vous? Avez vous déjà essayé les nouvelles possibilités de TikZ?
 
Non, j'ai essayé de compiler des exemples du manuel, et cela ne produit rien du tout.
 
Meme si vous les ouvrez dans un navigateur web? (les SVG )
 
@DavidCarlisle well I could use l3draw, but actually I'm trying to use as many primitives as possible here, as the code should run a few thousands time.
 
Je n'ai pas essayé, je vais essayer. En l'ouvrant avec un lecteur de PDF, la page est blanche. J'essaie immédiatement et je vous dis le résultat.
 
@DavidCarlisle With all my heart started school on January 7 and I already feel stressed and with my head in the clouds. I don't remember what I did, among a thousand things, not even five hours ago. I just got out of bed and I'm already nervous and confused. Nervous because some colleagues don't deserve the title of "teacher" at all. I really apologize for the nth time I do not remember what I sent you :-(
 
5:05 PM
@Sebastiano you didn't send me anything as far as I recall (nor was I expecting anything:-)
 
@AndréC, Hola', my best greetings from Sicily. My sincere congratulations for your works in LaTeX.
 
@AlexG Je n'ai pas essayé, je vais essayer. En l'ouvrant avec un lecteur de PDF, la page est blanche. J'essaie immédiatement et je vous dis le résultat
 
@UlrikeFischer Not yet. Getting a good syntax is tough.
 
@Sebastiano Thank you very much, I'm experimenting with the animations in the manual. I don't really understand it. Fortunately AlexG is here!
@AlexG Je viens d'essayer ce code de la page 221 :
\tikz
\node :fill opacity = { 0s="1", 2s="0", begin on=click }
:rotate = { 0s="0", 2s="90", begin on=click }
[fill = blue!20, draw = blue, ultra thick, circle]
{Click me!};
Sur Chrome, rien ne se passe en cliquant, ni sur Opera et encore moins avec Firefox. je dois mal m'y prendre.
 
@DavidCarlisle I had to deal with school-work alternation. Yesterday evening I was working on it a little (4 hours of wasted time) and I realized, after my administrative checks, that the proposal of a colleague was impractical. Do you know what happened? That the colleague who proposed the initiative knew that it could not be done and did not tell me anything. If I had not informed myself by now, I would have wasted so much time unnecessarily. I am very sorry.
@egreg Hi very kind Enrico I send you a warm greeting and I always thank you all. I almost always read your email. You are great! Greetings.
@marmot Yes, I have understood it perfectly (this time it's :-)). I wanted to ask you a courtesy if you could place the two images of the issue that I enclose not vertically but horizontally. When I compile the two images are vertical and not horizontal. My best regards.
5
Q: Wavelength for de Broglie waves

SebastianoStarting from this old question How to draw a sine wave on a circular path in tikz I have modified the source code according for my interest: \documentclass[tikz]{standalone} \usepackage{pgfplots} \usepackage{amsmath} \begin{document} \foreach \n in{3,4}{% \begin{tikzp...

 
5:13 PM
\documentclass[dvisvgm]{standalone}
\usepackage{tikz}
\usetikzlibrary{animations}

\begin{document}

\tikz
\node :fill opacity = { 0s="1", 2s="0", begin on=click }
:rotate = { 0s="0", 2s="90", begin on=click }
[fill = blue!20, draw = blue, ultra thick, circle]
{Click me!};

\end{document}
 
Wow it got late fast. But fontspec is now deprecation-free and on its way to CTAN. Night!
 
A best regards all your users into chat. Let's see if I can take a shower so I can warm up a bit.
 
@Sebastiano I need to go teach now. Hope not to forget.
 
@AndréC : Deux fois latex, ensuite: dvisvgm --exact --font-format=woff --zoom=-1
 
@AlexG On ne peut donc pas compiler avec pdflatex ?
 
5:16 PM
pdflatex --output-format=dvi
 
@marmot Sincerely, you and many others here I'm glad you make me laugh :-). Even if my students at the Art School are not studying much, I would say that they are fantastic from a human point of view and educated. Now I'm going, but I'd like some help from how to get away from my unprepared colleagues :_(. Here at me you are welcome.
 
@AlexG Avec texmaker, je dois donc créer une chaîne de compilation spéciale, si je comprends bien, non ?
 
@AndréC Oui, ce serait utile peut etre. Mois je fais tout sur la ligne de commande.
 
@AlexG Could you also add the German instructions how to compile this?
 
@marmot zweimal latex, dann: dvisvgm --exact --font-format=woff --zoom=-1
 
5:24 PM
Je ne suis pas habitué à la ligne de commande. Il serait certainement mieux que je pose une question sur ça sur le site afin que vous expliquiez comment on compile ce doument en ligne de commande (à défaut de Texmaker) ou de Texstudio, non ?
 
@AndréC Yes could be a good idea, because the TikZ manual doesn't tell much about it. But maybe someone else has it done already?
 
@AlexG merci, le temps d'écrire la question...
 
@AndréC Oui, et moi, je rentre chez mois maintenant. Assez de temps pour vous ;-)
 
@AlexG merci, bonne route, soyez prudent :-)
 
@AndréC Oui, beaucoup de neige ici.
 
5:31 PM
@AlexG Quelle chance ! Je rêve de voir la neige tomber ici à Paris, mais il fait trop chaud ! :-(
 
+2°, Il neige quand meme.
 
@DavidCarlisle: Precisamos quebrar a barreira linguística imposta.
 
@PauloCereda Peixe de babel?
 
@PauloCereda Ich verstehe alle Sprachen
 
@AlexG On appelle ça de la neige mouillée ici. Elle ne tient pas et rend tout glissant. Il faut être très prudent !
 
5:34 PM
@AlexG I should check my Hitchhiker's guide and see how they translated it to Portuguese. :)
 
@AndréC @PauloCereda comprend le français mais ne comprend pas la neige.
 
@AndréC Schneematsch sur la rue, Schneeregen qui tombe.
 
@AndréC Avec texstudio vous pouvez faire
% !TeX TS-program = latex % | latex % | dvisvgm --exact --font-format=woff --zoom=-1 %.dvi
\documentclass[dvisvgm]{standalone}
\usepackage{tikz}
\usetikzlibrary{animations}

\begin{document}

\tikz
\node :fill opacity = { 0s="1", 2s="0", begin on=click }
:rotate = { 0s="0", 2s="90", begin on=click }
[fill = blue!20, draw = blue, ultra thick, circle]
{Click me!};

\end{document}
 
@PauloCereda Obrigado!
 
5:37 PM
Mon aéroglisseur est plein d'anguilles.
@DavidCarlisle ^^
@samcarter Hum an arara rule....
 
@DavidCarlisle Che bisogno abbiamo dell'inglese, quando esiste Google Translator?
 
@PauloCereda a dvisvgm rule would be cool - or is there already one?
 
@samcarter No...
 
@PauloCereda mmm, maybe I'll try to make one tonight, but now I'm off for some exercise
 
@samcarter I can write one, provided that you help me with tohse parameters. :)
 
5:46 PM
@CarLaTeX È bello avere un oracolo infallibile
 
@DavidCarlisle Esatto!
 
0
Q: How do we compile and visualize the animations of Tikz 3.1?

AndréCI copied and pasted the example from page 221 of manual 3.1 and tried to compile it with texmaker. \documentclass[dvisvgm]{standalone} \usepackage{tikz} \usetikzlibrary{animations} \begin{document} \tikz \node :fill opacity = { 0s="1", 2s="0", begin on=click } :rotate = { 0s="0", 2s="90...

 
@AndréC That's a good question. :)
 
6:08 PM
@PauloCereda Do you have any experience with issue templates in GitLab? (Or maybe github has similar)
 
@AlanMunn A bit...
@AlanMunn will poke you, hold on.
 
6:55 PM
@PauloCereda Thank you, I feel less stupid after Ulrike's answer. I'm waiting for AlexG's now.
@PauloCereda Oui, brisons les chaînes qui nous entravent !
 
@AlexG Danke!
 
@DavidCarlisle Pour expliquer la neige aux enfants, ma grand-mère me disait autrefois que « le bon Dieu plume ses oies ». Je ne suis pas certain que cela soit mieux pour Paulo :-)
 
7:30 PM
@Sebastiano Something like this?
\documentclass{article}
\usepackage{amsmath}
\usepackage{subcaption}
\usepackage{floatrow}
\usepackage{pgfplots}
\usetikzlibrary{decorations.markings,calc}
\tikzset{mark two maxima/.style n args={3}{%
postaction=decorate,decoration={markings,
mark=at position #1 with {\draw[purple] (0,0) -- (0,-12pt) coordinate[midway] (x0);},
mark=at position #2 with {\draw[purple] (0,0) -- (0,-12pt) coordinate[midway](x1);
\draw let
\p1=($(x1)-(x0)$),\n1={atan2(\y1,\x1)},\n2={veclen(\x1,\y1)*(1/(2*sin(360*#2/2)))}
 
7:55 PM
@AndréC ducks not geese:-)
 
8:34 PM
@DavidCarlisle So he can now understand snow:-)
 
@AndréC he thinks anything below 20C is "freezing" so I think the concept of solid water is slightly problematic....
 
8:49 PM
@DavidCarlisle My niece who lives on Reunion Island has exactly the same problem: below 25°C, it is cold and she wears a wool sweater.
 
@marmot Your code not compile. Missing \begin{document} (peraphs). I would sonly that you edit your code here: tex.stackexchange.com/questions/457265/… to have two pictures in horizontal and not in vertical (thank you very much)
 
9:16 PM
Now the university moved my email to the alumni platform... hmmm....
 
@PauloCereda Is it a signal?
 
9:50 PM
@PauloCereda Could you have a look if the following simple dvisvgm rule makes sense?
!config
identifier: dvisvgm
name: DVISVGM
commands:
- name: The dvisvgm program
  command: >
    @{
        base = getBasename(file).concat('.dvi');
        return getCommand('dvisvgm', base, options);
    }
arguments:
- identifier: options
  flag: >
    @{
        if (isList(parameters.options)) {
            return parameters.options;
        }
        else {
            throwError('I was expecting a list of options.');
        }
    }
@PauloCereda and a test document:
 
\documentclass{article}
\usepackage{amsmath}
\usepackage{subcaption}
\usepackage{floatrow}
\usepackage{pgfplots}
\usetikzlibrary{decorations.markings,calc}
\tikzset{mark two maxima/.style n args={3}{%
postaction=decorate,decoration={markings,
mark=at position #1 with {\draw[purple] (0,0) -- (0,-12pt) coordinate[midway] (x0);},
mark=at position #2 with {\draw[purple] (0,0) -- (0,-12pt) coordinate[midway](x1);
\draw let
\p1=($(x1)-(x0)$),\n1={atan2(\y1,\x1)},\n2={veclen(\x1,\y1)*(1/(2*sin(360*#2/2)))}
 
% !TeX TS-program = txs:///arara
% arara: latex
% arara: latex
% arara: dvisvgm : {options: ['exact', 'font-format=woff', 'zoom=-1']}
\documentclass[dvisvgm]{standalone}
\usepackage{tikz}
\usetikzlibrary{animations}

\begin{document}

\tikz
\node :fill opacity = { 0s="1", 2s="0", begin on=click }
:rotate = { 0s="0", 2s="90", begin on=click }
[fill = blue!20, draw = blue, ultra thick, circle]
{Click me!};

\end{document}
 
@Sebastiano ^^^ another trial
 
10:11 PM
@marmot Great!!!!!!!!!!!!! Can I edit your primary question and put also this code, please? Or do you prefer that edit yourself? Thank you very much.
@marmot During the compilation there is: Missing chars ;,;,;,;,;,;,;,; Why?
@HenriMenke Good evening and welcome.
 
10:35 PM
@Sebastiano Sorry, first you say it works great and then you say it doesn't. (On my machine there are no issues.) Did you use this document literally?
 
@marmot There are a number of Missing character: There is no ; in font nullfont! in the log. @Sebastiano don't worry about them, they are harmless.
 
@UlrikeFischer Thanks! @Sebastiano I fixed them and posted the code here.
 

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