@percusse: get your gun, sir: youtube.com/watch?v=2rjbtsX7twc

@egreg vim would do that. It's just that e`vi`l. I am a little concerned about the chances of LyX questions on this site though. We really don't have anyone (that I know of) versed well-enough with LyX to answer questions like this, or even to bounce questions back at the asker... :(

@AndrewStacey Huh, interesting, but explains a problem I had some time ago. The change also makes it impossible to do atan2(\p0) with calc and let … in :(

@Qrrbrbirlbel But it does bring PGF in line with the rest of the world so on the whole it's a Good Thing. For your let syntax you could define a new function which is a wrapper around atan2 but with the arguments swapped. In the latest version of hobby (on the launchpad page) then I do something like that to ensure that whichever version of atan2 is used then I get the right answer.

I'm trying to get a custom command to work that displays a small png graphic inside a table

About ready to pull my hair out

\newcommand{\yes}{\raisebox{-\totalheight}{\includegraphics{img/yes.png}}}

any reason why that wouldn't work?

Seems pretty straightforward

The error is:

Underfull \hbox (badness 3919) in paragraph at lines 207--208
[]|\OT1/cmr/m/n/10.95 PK, in-cre-mented by

@Dan Not an error

@JosephWright it won't compile

@Dan You have a line that TeX can't fill 'nicely'

@Dan Well that may be the case but has nothing to do with the underfull box

@JosephWright changing the only column width I have control over to almost 0 makes no different

*difference

@JosephWright what can I do?

@Dan About the box?

@JosephWright I don't understand, it is a table, not supposed to be a box

Whatever I need to do to get the document to compile

@Dan The two things you've posted don't show an error so there is not much I can say

Something else must be up

I have a table and I am inserting small png graphics in various columns, which I suspect is the culprit(s)

@Dan everything in TeX is a box or glue it doesn't mean a printed frame, just the internal structure TeX uses

@Dan That's normally fine: there must be something else

@Dan but you have not shown any problem that we can fix

! Missing $ inserted.
<inserted text>
                $
l.208 	ACC_
           LEV			& smallint				& 2 bytes				& \nope				& \yes			& Access lev...

?

[6] [7] <img/no.png, id=74, 4.58566pt x 4.58566pt> <use img/no.png>
<img/yes.png, id=75, 25.09375pt x 22.0825pt> <use img/yes.png>
Underfull \hbox (badness 3919) in paragraph at lines 207--208
[]|\OT1/cmr/m/n/10.95 PK, in-cre-mented by
! Missing $ inserted.
<inserted text>
                $
l.208 	ACC_
           LEV			& smallint				& 2 bytes				& \nope				& \yes			& Access lev...

?

@Dan that is an error _ is a math command for subscript you need \ _

is any of this an error?

@DavidCarlisle oh wow

\_ not \ _ stupid backtick formating in comments

<hangs head in shame>

all along my custom command codes were fine

I just put an underscore in there

gahhh!!!

well... thank you both VERY much

@DavidCarlisle @JosephWright on the bright side, I've mostly been able to get the hang of this

I'm thinking the late hour contributed to this error :P

@SeanAllred There's scottkosty who already commented on that one. You have a point though, but I'm not sure what can be done about it. I've referred people to the mailing list a couple of times, asking them to post there if no answer is given here.

@SeanAllred That question is not answerable anyway.

Happy Talk Like a Pirate Day!

arrrrrrr, really? That?s today. And I already missed 12,5 hours without doing so...

Well, maybe better. Don't know, if they would understand that in Switzerland

@PauloCereda How do pirates talk?

@egreg A good resource: yarr.org.uk/talk :)

@JosephWright: ^^ :) Good old times of hat features. :)

@PauloCereda Yo-ho-ho

@egreg Ahoy! Da'id is tryin to steal yer precious great doubloons!

@JosephWright On the search for a per mille sign in siunitx I found out, there is non. If I may do a feature request: In Germany we use that quite often (seems like in English speaking countries they don't). So a command for "per mille" (engl.) or "per mill" (am. engl.) would be cool. While searching I saw the sentence "[...] also predefines the \percent macro. While this is not a unit, it [...]". Regarding our discussion the last day, it actually is a unit. Just for your info. Thanks a lot.

@egreg the "ho-ho" sounds more like Santa Claus... :-)

But actually, apart of "arrrrrrrr" everywhere.... No clue, how a pirate talks in English

@LaRiFaRi I just followed instructions.

@egreg Oh, yeah, I see it at the end of the provided link. I will do my homeworks first...

@egreg Hi. Stuck again :(

@PauloCereda Hi Paulo

\documentclass[
  answers,12pt
]{exam}
\usepackage{environ,xparse}

\usepackage[
  a4paper,
  left=1in,
  right=0.8in,
  top=1in,
  bottom=0.8in,
  headheight=\baselineskip,
  %headsep=4mm,
  %footskip=13mm,
  %footskip=5mm,
]{geometry}
%%---------------------------------------------------------
\ExplSyntaxOn
\cs_undefine:N \choices
\cs_undefine:N \endchoices
\NewEnviron{choices}{%
  \par\nopagebreak
  \harish_dochoices:V \BODY
  \par
}
\tl_new:N \l_harish_choices_tl
\seq_new:N \l_harish_choices_seq

gives this:

My brain goes OFF with \ExplSyntaxOn

@HarishKumar Hi Harish! How are you?

ooh I see a pokémon!

:)

yes

yes you do

ummm i have a question

the other day i was talking in here with david carlisle

about how i am getting heaps of underfull hboxes

because i am a latex noob

i basically have latex that looks a little like this

david was saying it wasnt good, but we had to end the conversation there as he had to go

im sort of wondering if anyone has a hint or tip

@HarishKumar You put the choice in a makebox, which doesn't do line breaking. parbox instead, perhaps.

@nebffa got to go again but \textbf{Question 1} \\ is bad in three ways (not bad for such a small fragment:-) It has an explicit font change, and explicit number, and an explicit line break. it should be \question or \item or some such with all the font and numbering being automatic

@DavidCarlisle lol :p. yeah i thought to use the exam package for this, but i decided against using it because it didn't have the kind of formattting i wanted

@DavidCarlisle i presume you are saying it is good to use something like what the exam package offers, but more basic?

@nebffa or even just stick \newcounter{question}\newcommand\question{\refstepcounter{question}\textbf\theq‌​uestion}\par} in the preamble so you can use \question

@DavidCarlisle ok thanks david. i will ask some more questions if you are around tomorrow.

@DavidCarlisle i will use that neat command you just wrote

@TorbjørnT. Oh yes, but

\seq_map_inline:Nn \l_harish_choices_final_seq { \makebox[.5\linewidth][l]{\parbox{.5\linewidth}{##1}}\hspace{0pt plus .3\linewidth} }
 }

gives this:

but and in one line are not indented. I don't understand the expl3 code from egreg which needs to be changed to do this. :(

@HarishKumar Never really tried learning expl3 so I probably can't help. Easier to wait for @egreg.

@TorbjørnT. Me too. That is why I am troubling @egreg :)

@egreg When you get some free time can you please look into this please? No need to hurry though. Thanks.

@AndrewStacey That's what I did in an answer which could be optimized (the definition of atan2 will most likely not change in the document):

\tikzset{
  declare function={% in case of CVS which switches the arguments of atan2
    atan3(\a,\b)=ifthenelse(atan2(0,1)==90, atan2(\a,\b), atan2(\b,\a));},
}

@nebffa note that is the simplest possible thing (although even that allows automatic referencing and (with hyperef) linking with \label and ref) but a proper definition using list \item or \section style command would do more, controlling indentation and discouraging page breaks just after the heading etc.

@HarishKumar Oh, if the text doesn't fit in half a line you are in big trouble.

@DavidCarlisle ummm if you're still here david, it might be best if i tell you what exactly i am doing

@DavidCarlisle i am generating all of my latex file from a python program

@DavidCarlisle at the moment, i make an entire question in python with all its subparts, and then i traverse that question and write out the latex

@DavidCarlisle so what i have been doing up until now is just indenting parts of the question in proportion to how deep in the question those parts are

@DavidCarlisle also, because that's all i know how to do with latex

@DavidCarlisle from what you are saying, it sounds like i could make a custom function based on \item

@DavidCarlisle that does most of what i want to do?

@DavidCarlisle the main two things being question lines, and indented whitespace

@nebffa that's what latex lists do anyway try using \begin{enumerate}\item \begin{enumerate}.... If you let latex handle it (enumitem package makes it easy) then the generated document source will look a lot nicer. Compare the markup in the question with the markup on my answer (here it is case rather than Question, but same thing really) tex.stackexchange.com/questions/133511/…

@Qrrbrbirlbel Pretty much what I do, except that I do a one-time test as you suggest. I guess the most optimal would be that if the inbuilt atan2 command is the one that you want then not to define a wrapper but just an alias. Since, allegedly, Dr Who can't kill Hitler, I guess the next best thing would be to fix the definition of atan2 in the PGF source right from the start.

@PauloCereda Pennacchio

@egreg In Portuguese, pluma. :)

LaTeX3 folks: I would like to write the LaTeX3 equivalent of \let\oldexists\exists. Given that it takes no arguments, is it better to treat \oldexists as a token list variable (i.e., \tl_set_eq:NN \l__mymodule_oldexists_tl \exists) or as a control sequence (i.e., \cs_set_eq:NN \__mymodule_oldexists: \exists)?

@HenryDeYoung Probably a function, I think, as it's a document command (= function)

@JosephWright That's how I was leaning, too, but I felt slightly unsettled giving no argument specification after the :. Thanks.

@HenryDeYoung Definitely \cs_set_eq:NN and with a signature. You can even use \cs_generate_variant:Nn on the alias, then. I gave an example some days ago: tex.stackexchange.com/a/133779/4427

@HenryDeYoung Not your case, but it's worth noticing it.

People, @Jake is -602 from 100k

@egreg Roger that, leave it to me. :)

@DavidCarlisle And don't say I'm not sporting

@egreg but quite correctly I kept the points:-)

@DavidCarlisle I could offer a bounty to that question and give the rep points to egreg. :)

@PauloCereda It would be a waste of good rep points. You'd be better to give them to me.

@DavidCarlisle But you already have the green tick. :)

@PauloCereda Don't dare!

@egreg :)

iOS 7 is very good for the iPad, so I recommend the update to iPad users. :)

Hello :-)

@NicolaTalbot Yay Nicola is here!

@PauloCereda :-) It looks like I missed the chance to get a bounty last week for a glossaries question.

That will teach me to be really busy ;-)

@NicolaTalbot If I can make you feel better, Heiko understands arara way better than I do and answered a question before me. :)

@PauloCereda I wouldn't be surprised if Heiko understands glossaries way better than I do as well. :-)

@NicolaTalbot LOL

@Nicola: Meanwhile, @David got a TikZ badge by providing answers to TikZ questions via picture mode, plain TeX or using \tracingall. :)

@PauloCereda LOL :-)

How can I force a table to display at the location I want it and then continue onto the next page? I am using the longtable package already

@Dan I find that longtable usually starts from where I put the beginning of the longtable environment, but @DavidCarlisle's the one to ask.

@NicolaTalbot it isn't working for me

@Dan You surely don't have your longtable in a table environment, do you?

@egreg no, I had it in a figure and removing that made it go to separate pages

@egreg but it changes widths in the middle

@egreg all of a sudden the entire table gets wider

@egreg hold up, compiling it again fixed it

a fluke I guess?

@egreg: Maybe you are also interested in the comment: tex.stackexchange.com/questions/134121/…

@Dan You mustn't have longtable in a floating environment. The column widths are computed during several LaTeX runs; one or two are usually necessary, sometimes more.

@egreg gotcha, so that's why it takes numerous compiles

@Dan must be user error:-)

@DavidCarlisle it certainly was an ID10T error

:P

@PauloCereda silver no less

@DavidCarlisle You could give a keynote for this year's UK-TUG about the power of \tracingall and how manuals can be avoided. :)

@PauloCereda I could use the log file from this as slides

\tracingall
\documentclass{beamer}
\begin{document}
\end{document}

@DavidCarlisle How long will be the keynote?

@DavidCarlisle Sweet Lord. :) You'll kill the audience except @JosephWright. :)

@PauloCereda :-)

not sure how big that is 240000 lines so far....

oops emacs is warning it's over 9MB..

@DavidCarlisle Try with vim. :)

@PauloCereda -bash: vim: command not found

@PauloCereda still running (22M of log file so far)

@PauloCereda yeh it's finished:

$ wc -l b1.log
1281762 b1.log
$ ls -lh b1.log
-rw-r--r--+ 1 davidc Domain Users 31M Sep 19 22:13 b1.log

@DavidCarlisle Quite a long keynote indeed.

@egreg and any difficult questions I can defer to @JosephWright

@egreg Enrico, Does it mean that there is no rescue party? What to do then? Some of my answer do cross the limit. :(

@DavidCarlisle Emacs can open big files. I did it with nearly 4 lac lines! There is an addon (or whatever) to be installed. You can find it in the list inside Emacs.

@HarishKumar Typesetting alternatives in that way is bad. You can use a \parbox instead of \makebox. Unfortunately I have not the source here (it's in the machine at the office).

@egreg Thanks. You are still awake!. If you want, I can post the source again. And yes, we are forced to follow bad things some times :(

@HarishKumar Another half hour or so.

It isn't my answer that is big. Somebody typed it in word. And I want it in LaTeX ;)

@egreg Shall I repost the source if you are not tired? Or else tomorrow? I have two more days time. I don't want to squeeze your energy :)

@HarishKumar I can't promise to do it soon.

But it's better if you put it here now.

@egreg Thanks. It is I tried with \parbox But the answers are not indented in the second line. I am putting the code below:

\documentclass[
  answers,12pt
]{exam}
\usepackage{environ,xparse}

\usepackage[
  a4paper,
  left=1in,
  right=0.8in,
  top=1in,
  bottom=0.8in,
  headheight=\baselineskip,
  %headsep=4mm,
  %footskip=13mm,
  %footskip=5mm,
]{geometry}
%%---------------------------------------------------------
\ExplSyntaxOn
\cs_undefine:N \choices
\cs_undefine:N \endchoices
\NewEnviron{choices}{%
  \par\nopagebreak
  \harish_dochoices:V \BODY
  \par
}
\tl_new:N \l_harish_choices_tl
\seq_new:N \l_harish_choices_seq

@egreg Please take your time.

@HarishKumar OK

@HarishKumar Here it is

\documentclass[
  answers,12pt
]{exam}
\usepackage{environ,xparse}

\usepackage[
  a4paper,
  left=1in,
  right=0.8in,
  top=1in,
  bottom=0.8in,
  headheight=\baselineskip,
  %headsep=4mm,
  %footskip=13mm,
  %footskip=5mm,
]{geometry}
%%---------------------------------------------------------
\ExplSyntaxOn
\cs_undefine:N \choices
\cs_undefine:N \endchoices
\NewEnviron{choices}{%
  \par\nopagebreak
  \harish_dochoices:V \BODY
  \par
}
\tl_new:N \l_harish_choices_tl
\seq_new:N \l_harish_choices_seq

@egreg Thanks. It does work. I knew that! :) Thank you Thank you Thank you.

@HarishKumar You're welcome

Because it must be almost 12 midnight there for you. And I see you here aging within 5-6 hours almost everyday.