## Weblog update: LaTeX now available

After Jean S’s comments written in LaTeX, I decided it was time to add TeX support once and for all. Since the webhost doesn’t have LaTeX installed, I had to use mimeTeX, which supports just basic TeX without all the flourishes, but should be good enough to produce some good quality
equations and symbols sufficient for the uses employed here.

If Steve want to use TeX within posts then he can put [ tex] and [/ tex] either side of his formulae and they will be rendered into TeX when he saves the post. (Note that I’ve put an extra space in the square brackets so that they are not rendered here, but you need to remove the spaces when you use them)

For commenters, TeX is available in the same manner, but since there is no preview, and you cannot go back and edit your comments, you get one shot at it. I would suggest that you pre-render your LaTeX commands on your favorite platform to make sure that they will work, before adding them to the comment.

For example:

[ tex] x = \frac{ -b \pm \sqrt{b^2 – 4ac}}{2a}[/ tex]

will produce the general quadratic formula

$x = \frac{ -b \pm \sqrt{b^2 - 4ac}}{2a}$

1. fFreddy
Posted May 7, 2006 at 9:45 AM | Permalink | Reply

$\sigma\mu\alpha\chi\iota\nu\gamma$

2. Steve McIntyre
Posted May 7, 2006 at 10:22 AM | Permalink | Reply

John A., this is cool. Thanks for this. It’s particularly nice having some templates to cut and paste.

3. John A
Posted May 7, 2006 at 10:50 AM | Permalink | Reply

Autocorrelation:

$R(k) = \frac{E[(X_i - \mu)(X_{i+k} - \mu)]}{\sigma^2}$

4. Posted May 7, 2006 at 12:19 PM | Permalink | Reply

As Einstein and Maxwell would say,

$S = \int d^4x \sqrt{-g}\left(\frac{R}{16\pi G_N} - \frac{1}{4}F_{\mu\nu}F^{\mu\nu}\right)$

very good.

5. ET SidViscous
Posted May 7, 2006 at 12:50 PM | Permalink | Reply

$2+2=4$

6. Gerald Machnee
Posted May 7, 2006 at 1:21 PM | Permalink | Reply

Now we go back to school.

7. Posted May 7, 2006 at 2:41 PM | Permalink | Reply

here is a latex formula writing overview

8. Posted May 7, 2006 at 4:31 PM | Permalink | Reply

latex test…
$\includegraphics{http://home.casema.nl/errenwijlens/co2/centraleuropetempupd.gif}$

9. Posted May 7, 2006 at 4:34 PM | Permalink | Reply

didn’t work,

john a any plans to implement images like on the phbb fora?
http://www.phpbb.com/

10. Willis Eschenbach
Posted May 7, 2006 at 6:24 PM | Permalink | Reply

Re 7, Hans, thanks for the overview, very useful.

w.

11. The Knowing One
Posted May 7, 2006 at 9:44 PM | Permalink | Reply

It’s really nice to have TeX support. Currently, however, the images are rendered in a fixed number of pixels and do not scale. So for someone who has a very high resolution screen, the images are almost unreadably small. (Opera sort-of scales images; Firefox and IE don’t.)

There have been discussions about how to handle this problem at Wikipedia, and I think something is currently being implemented (to render images in em’s rather than px’s).

12. Jean S
Posted May 8, 2006 at 4:03 AM | Permalink | Reply

Nice, thanks John A. Can you also put a tag which would automatically correct my bad spelling and broken English

13. John A
Posted May 8, 2006 at 5:13 AM | Permalink | Reply

Re: #12

Mais oui! The button “Lookup” checks words against a good online English dictionary – at no extra charge.

14. ET SidViscous
Posted May 8, 2006 at 6:35 AM | Permalink | Reply

Well you could have told us that before.

15. Posted May 9, 2006 at 12:05 PM | Permalink | Reply

Hi John. What plugin did you use in wordpress for this?

16. John A
Posted May 9, 2006 at 1:04 PM | Permalink | Reply
17. Steve McIntyre
Posted May 9, 2006 at 1:20 PM | Permalink | Reply

John, if I wanted to write something that is LAtex-compatible, what software would you recommend?

18. John A
Posted May 10, 2006 at 4:10 AM | Permalink | Reply

Re: #17

Probably the best is the freeware TexMaker for Windows. (it’s also available for MacOS and Linux)

LaTeX is so frequently used in academia from anything from theses to research papers to books that I’d think it a worthwhile investment of time to learn the basics.

19. Jean S
Posted May 10, 2006 at 4:36 AM | Permalink | Reply

Re #17, #18: Notice that TexMaker is an editor (a shell) for LaTeX, i.e., essentially a text editor taylored for producing LaTeX code. So in order to compile your code, your need an actual TeX-instalation. Most Windows users I know use MikTeX, which is easy to install and update. Another good LaTeX editor for Windows is TeXnicCenter, which is directly integrated to MikTeX. I have that combination on my Windows laptop, but I mainly use teTeX+emacs (Linux) on my desktop.

20. John A
Posted May 10, 2006 at 4:39 AM | Permalink | Reply

Quite right. I installed mikTeX on Windows before installing TexMaker. I just forgot to mention it….

21. TAC
Posted Jun 12, 2006 at 6:24 PM | Permalink | Reply

$\Tau \Alpha \Gamma$

22. Steve McIntyre
Posted Jun 15, 2006 at 7:10 AM | Permalink | Reply

I just discovered something interesting about LaTex editing: if you don’t have your own LaTex editor, you can build LaTex expressions in the Comment section here and copy them into Word.

23. Jim Erlandson
Posted Jun 15, 2006 at 2:27 PM | Permalink | Reply

#22 Steve M.: Word 2007 has/will have (beta version available free) its own equation tools. Not LaTeX but still pretty.

24. Spence_UK
Posted Jun 15, 2006 at 3:25 PM | Permalink | Reply

For my “day job” I have to use the Microsoft Equation editor (standard where I work). I’ve been using it since Microsoft Word ’97, so it has been shipped with Office since then, but you have to use a custom install and check the equation editor option at install time. Annoyingly it uses non-standard fonts so if you subsequently look at the document on a machine that doesn’t have the equation editor installed stuff looks and prints wrong (dots over variables turn into ampersands… helpful!)

I don’t think I would use the Microsoft Equation editor if I had a choice. It is not especially intuitive or easy to use, and although it has a fair range of capabilities, I’ve come across expressions I’ve been unable to do in it. It also seems to make Word more crash-prone as well… certainly with an early release of Word 2003 and Equation Editor 3.0 I could get it to consistently crash just by copying an equation, editing it and then trying to save the document…

25. Mark
Posted Jun 15, 2006 at 4:40 PM | Permalink | Reply

I DL’d an add-on to Equation 3.0, called Mathtype I think. It adds to the functionality immensely and seems to make it work better.

Mark

26. bender
Posted Sep 28, 2006 at 3:38 PM | Permalink | Reply

test:
$latex y 27. bender Posted Sep 28, 2006 at 3:42 PM | Permalink | Reply test2: $y_{ij} ^2$ Stev – you need to have the closing saying [ /tex] – leave out the blank. 28. bender Posted Sep 28, 2006 at 4:08 PM | Permalink | Reply I tried that. I think the problem is “lt” test3: $y<-mx+b$ 29. bender Posted Sep 28, 2006 at 4:13 PM | Permalink | Reply Who on earth decided the $<$ character would make a good one for indicating a tag? Obviously not a mathematical programmer. This means it is not possible to get a cop-and-pastable $<$, which means you can’t copy and paste R scripts into posts. Rhetorical question. Thanks for allowing the tests. 30. Dave Dardinger Posted Sep 28, 2006 at 4:22 PM | Permalink | Reply I wonder if there’s a font handy which could be used to allow copy and paste of some of the troublesome things. Of course if the font wasn’t available on your computer things would look weird, but at least the rest of the string would be readable. There are generally lots of foreign and obsolete characters which could be replaced. 31. Paul Linsay Posted Sep 28, 2006 at 7:55 PM | Permalink | Reply Tex test$latex
\eqalign{&dK=-\lambda Kdt+Idt\cr &giving\ the\ ODE\cr \over {dt}}=-\lambda K+I\cr}
$32. Paul Linsay Posted Sep 28, 2006 at 7:58 PM | Permalink | Reply $%MathType!ZZhx47!eaaadCGceeqabiXGKjXGljGH9iGHTiaHSjXGljXGKjXG0jGHRiXGjj %XGKjXG0bqad4aaaeGedsMedUeabiXGKjXG0baacyypcyylcqiBsm4s %cy4ksmysaaaa!13A5!$$dK=-\lambda Kdt+Idt\cr
{{dK} \over {dt}}=-\lambda K+I\cr$$33. Paul Linsay Posted Sep 28, 2006 at 7:59 PM | Permalink | Reply Last try latex$$dK=-\lambda Kdt+Idt\cr
{{dK} \over {dt}}=-\lambda K+I\cr
$34. John Creighton Posted Feb 8, 2007 at 11:49 PM | Permalink | Reply $Pr(N_{t1}=k)= exp(- t 1 * ( \lambda _{1} '€" lanbda _{o}) )*( t* ( \lambda _{1} + \lambda_{o} ) ^{k}$ 35. John Creighton Posted Feb 8, 2007 at 11:52 PM | Permalink | Reply $Pr(N_{k1}=N)= exp(- k1 * ( t * \lambda _{1} '€" \lambda _{o}) )*(k* (t* \lambda _{1} + \lambda_{o} ) ^{N}$ 36. Hans Erren Posted Feb 9, 2007 at 2:59 AM | Permalink | Reply use the code tag  3  37. Hans Erren Posted Feb 9, 2007 at 3:04 AM | Permalink | Reply interesting: I was trying 3 left pointed bracket 4 (3 lt 4), which showed up nice in the preview but not in the post. $3 \lt 4$ 38. Gerald Browning Posted Feb 9, 2007 at 12:42 PM | Permalink | Reply test [tex} a = b^c [\tex] 39. Gerald Browning Posted Feb 9, 2007 at 12:43 PM | Permalink | Reply test$latex a = b^c [\tex]

40. Gerald Browning
Posted Feb 9, 2007 at 12:48 PM | Permalink | Reply

test

\$latex a = b^{c}[\tex]

41. Gerald Browning
Posted Feb 9, 2007 at 12:49 PM | Permalink | Reply

$a = b^{c}$

test

42. Posted Feb 9, 2007 at 1:14 PM | Permalink | Reply

You’ve now worked the syntax for tags Gerald?

43. Gerald Browning
Posted Feb 9, 2007 at 5:45 PM | Permalink | Reply

John A (#42):

I would like to write my presentation in its entirety before submitting it. But if I have to use the tex tag in quicktags, that will not be possible. Is there some way to write the presentation in LaTeX on my home computer and then submit it so that it will interface with your blog (so I can preview the mathematical equations)?

Jerry

44. MrPete
Posted Jun 2, 2007 at 4:22 AM | Permalink | Reply

Just testing. I think I understand tex a bit better. $10^{11}$ should look better than $10^11$. Why should it be so hard?

45. John Creighton
Posted Jan 6, 2008 at 10:59 PM | Permalink | Reply

Test:

[ tex] x = \frac{ -b \pm \sqrt{b^2 – 4ac}}{2a}[/ tex]