TeX, LaTeX and Friends

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5:12 AM

(re [this question](http://tex.stackexchange.com/questions/27825/why-does-a-defined-command-appear-differently-in-the-align-environment) ) Does somebody know why
{\catcode`\,=\active \gdef,{\mbox{ok}}}
\def\macro{\begingroup \mathcode`\,="8000\relax \macrox}
\def\macrox#1{#1\endgroup}
…
$\macro{,}$
works, while
{\catcode`\,=\active \gdef,{\mbox{ok}}}
\def\macro{\begingroup \mathcode`\,="8000\relax \expandafter\endgroup\macrox}
\def\macrox#1{#1}
…
$\macro{,}$
doesn't?

2 hours later…

Joseph Wright

7:04 AM

@AndreyVihrov \mathcode and \catcode are not quite the same as each other. With \catcode, your approach would work as TeX will tokenize #1 as ,_{13}. On the other hand, \mathcode is not 'attached' to tokenized input, so it's the \mathcode at point of typesetting that is important.

Andrey Vihrov

7:44 AM

TeX is hard :-)

3 hours later…

egreg

10:36 AM

@AndreyVihrov \def\macro{\begingroup\mathcode\,="8000 \macrox` and \def\macrox#1{#1\endgroup} should work, because the \mathcode assignment is undone after the expansion of \macrox; but \def\macro#1{\begingroup\mathcode\,="8000 #1\endgroup}` is simpler.

When TeX finds a \mathcode with value "8000 it looks for the definition of the character as if it were active; but the character token found must have category 11 or 12 in order that its \mathcode is looked at.

Andrey Vihrov

@egreg Indeed. The two macros were there because I occurred to think that mathcodes, like catcodes, are assigned when reading input.

1 hour later…

Andrew Stacey

11:51 AM

Here's a bizarre error message ... though I doubt its veracity! Take a look at the linked screen shot in: tex.stackexchange.com/q/27852/86

Andrey Vihrov

@AndrewStacey Most likely some custom class file

@AndrewStacey Google proves me wrong, the line is generated by apacite (since when caps and triple exclamation marks are a good style?)

Martin Scharrer

The problem with ctanupload is that I sometimes find bugs only after I uploaded its new version to CTAN (using itself of course). :-(

@AndreyVihrov I found it as well using google code :-) It is indeed unrelated. A message like this shouldn't be produced by default.

egreg

12:08 PM

@AndrewStacey Emergency stop is issued in \nonstopmode when a required file is not found.

Or not writable; it probably has to do with the fact that some TeX file has the strange name wto_version2.0.tex with a "double extension".

1 hour later…

Alan Munn

1:34 PM

@AndreyVihrov It's probably APA style. :-) (Along with unnumbered sections and many other inanities.)

egreg

2:29 PM

@AlanMunn Would you make an answer out of your comments?

Q: Adding a .sty file to the appropriate directory?

I am using emacs on Ubuntu 10.10. I was trying to add doublespace.sty to my packages. To figure out what directory to put the doublespace.sty in I did a search on my computer for amsmath.sty, since I know that package works, and found the directory it was in, which was a subdirectory of /usr/s...

4 hours later…

Joseph Wright

6:25 PM

We are now down to 200 'unanswered' questions: someone has been working hard (@lockstep?)

Andrew Stacey

7:21 PM

I've now cobbled together a nice highlighting facility for a beamer presentation, using the background canvas to actually draw the highlighter strokes.

Going to use it "live" in tomorrow's lecture ..

Paulo Cereda

@AndrewStacey Cool, any preview for us?

Andrew Stacey

7:39 PM

@PauloCereda Scroll down to the last lecture (2011-09-09) on mathsnotes.math.ntnu.no/mathsnotes/show/lecture+notes+2011 and look at the beamer version.

Paulo Cereda

@AndrewStacey Awesome! They look very attractive to the eye. (a possible blog post?)

Paulo Cereda

8:04 PM

Congrats to Jukka Suomela, first one to earn the Populist badge: tex.stackexchange.com/badges/39/populist

Raphink

cool :)

lockstep

8:19 PM

@JosephWright No -- this must have been a co-production of many users. I only wrote two or three "Please convert your comment into an answer" messages.

Joseph Wright

@lockstep Well, it's done the job :-)

lockstep

After about a year, my not-too-spectacular answer to "Should I use center or centering for figures?" has received 50 upvotes. :-)

Martin Scharrer

I don't get the rules for that badge:
"Answer outscored an accepted answer with score of more than 10 by more than 2x. This badge can be awarded multiple times. "

The accepted answer has 16, Jukka's answer has 27 up-votes

Ok, the accepted answer must have over 10 up-votes (that's the case) and your answer must have more then 2x, which would be more than 32 up-votes, not 27.

lockstep

8:41 PM

@MartinScharrer The accepted answer gained some upvotes after Jukka had received the "Populist" badge. ;-)

Martin Scharrer

@lockstep Ahh, makes sense. It most likely had 13 up-votes then I guess.

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