LaTeX and other markup!

For the discussion of math. Duh.

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gmalivuk
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LaTeX and other markup!

Postby gmalivuk » Fri May 02, 2008 3:37 pm UTC

As many of you already know, the fora now have LaTeX support. This, combined with the [sup] and [sub] tags which have been around for awhile, should make it far easier to type math formulae. jsMath, which is what the new math and imath tags use, only works properly in the prosilver or prosilver_left styles. Sorry, subsilver adherents, but your favorite skin is no longer supported.

Much of the syntax is pretty self-explanatory, and if nothing else you can quote an entry with math in it to see exactly what that person entered to typeset it that way. For a simple guide, you can check out Wikipedia's Help:Displaying a formula page.

What you would enter there between <math> and </math>, you would put here with square brackets. math places formulae in the center of a new line [math]something\ like\ this\ x^2_0[/math] while imath places it inline, which is only recommended for simpler (non-multiline) things, as it can get cramped otherwise. But for an example [imath]this\ is\ inline\ math\ x^2_0[/imath].

Please take advantage of this new feature, as it greatly expands the range of math that can be readably displayed on the forum.
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Re: LaTeX and other markup!

Postby SpitValve » Fri May 02, 2008 4:13 pm UTC

How complex can it be? Lesse:

[math]v(r)= \left\{
\begin{array}{rl}
2618.86r-11486.7r^2+27263.8r^3-36117.9r^4+24768r^5-6819r^6\mbox{ km/s } & \mbox{ if } r<0.09 \mbox{ kpc }
\\
319.8354-194.3591r+155.30181r^2-63.00332r^3+12.142556r^4-0.869573r^5 \mbox{ km/s } & \mbox{ if } r=0.09-0.45 \mbox{ kpc }
\\
-1931.3363+1768.47176r-606.461977r^2+112.102138r^3-11.9698505r^4 \mbox{ }& \\
+0.7367828r^5-0.02423453r^6+0.00032952r^7\mbox{ km/s} & \mbox{ if } r=0.45-1.6 \mbox{ kpc }
\\
264.76 \mbox{ km/s } & \mbox{ if } r>1.60 \mbox{ kpc }\\
\end{array}\right.[/math]

ooo-oooh... fancy.

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Re: LaTeX and other markup!

Postby Qoppa » Fri May 02, 2008 4:46 pm UTC

Before someone asks, to change the board skin from subsilver to prosilver:
User Control Panel (in the top right)
Board preferences (in the left options menu)
And then where it says 'My board style' change it to either prosilver or prosilver_left, the difference being prosilver has the avatars on the right side of the screen, and prosilver_left has them on the left (like subsilver).

Also, it's a good idea to change the size of the math to 150% so that it's easier to read and not distorted. You can do this by clicking on the little jsMath box in the bottom right corner, going options and then setting 'scale all mathematics to' to 150%. Make sure to set 'Save settings for' to '5 years' so that it actually stays like that.

Code: Select all

_=0,w=-1,(*t)(int,int);a()??<char*p="[gd\
~/d~/\\b\x7F\177l*~/~djal{x}h!\005h";(++w
<033)?(putchar((*t)(w??(p:>,w?_:0XD)),a()
):0;%>O(x,l)??<_='['/7;{return!(x%(_-11))
?x??'l:x^(1+ ++l);}??>main(){t=&O;w=a();}

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Re: LaTeX and other markup!

Postby Amnesiasoft » Fri May 02, 2008 8:04 pm UTC

gmalivuk wrote:Much of the syntax is pretty self-explanatory, and if nothing else you can quote an entry with math in it to see exactly what that person entered to typeset it that way.

You can also double click the formula to see as well.

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Re: LaTeX and other markup!

Postby ICDB » Sat May 03, 2008 11:16 pm UTC

I've heard people say this before, but the math looks much, much better on a Mac than on a PC.
Either, it's very nice!

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Re: LaTeX and other markup!

Postby Simon » Sun May 04, 2008 1:16 pm UTC

ICDB wrote:I've heard people say this before, but the math looks much, much better on a Mac than on a PC.
Either, it's very nice!

Proper TeX fonts at the correct weighting for both Mac OS and Windows (i.e. properly adjusted for the respective different gammas) are available here; installing the right set for your machine will make the maths look just as good on any machine.

(BTW, Linux (i.e. freetype) users should use the 'Mac' weighting; the PC ones show up too heavy.)
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Re: LaTeX and other markup!

Postby spaceinvader » Sun May 04, 2008 2:16 pm UTC

Hmm, does it support amsmath?

[math]\begin{align*}
\begin{bmatrix}
x\\
y
\end{bmatrix}
&= -\frac{1}{27} \begin{bmatrix}
4 & -5\\
-7 & 2
\end{bmatrix}
\begin{bmatrix}
17.1685\\
17.7848
\end{bmatrix}\\
\begin{bmatrix}
x\\
y
\end{bmatrix}
&= - \frac{1}{27} \begin{bmatrix}
-20.25\\
-84.6099
\end{bmatrix}\\
\begin{bmatrix}
x\\
y
\end{bmatrix}
&= \begin{bmatrix}
0.75\\
3.1337
\end{bmatrix}
\end{align*}[/math]

Wow, seems like it does! Neat.

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Re: LaTeX and other markup!

Postby Nimz » Mon May 05, 2008 7:43 am UTC

And pictures?
Spoiler:
[math]\begin{picture}(200,100)
\put(0,0){\line(1,2){12.5}}
\put(12.5,25){\line(0,1){50}}
\put(0,100){\line(1,-2){12.5}}

\put(50,0){\line(-1,2){12.5}}
\put(37.5,25){\line(0,1){50}}
\put(50,100){\line(-1,-2){12.5}}

\put(75,50){\line(1,0){50}}
\put(75,50){\line(1,1){6.25}}
\put(75,50){\line(1,-1){6.25}}
\put(125,50){\line(-1,-1){6.25}}
\put(125,50){\line(-1,1){6.25}}

\put(150,0){\line(1,1){37.5}}
\put(150,100){\line(1,-1){37.5}}
\put(187.5,37.5){\line(0,1){25}}

\put(200,0){\line(-1,1){18.75}}
\put(168.75,31.25){\line(-1,1){6.25}}
\put(162.5,37.5){\line(0,1){25}}
\put(162.5,62.5){\line(1,1){6.25}}
\put(200,100){\line(-1,-1){18.75}}

\put(-10,-10){a}
\put(55,-10){b}
\put(140,-10){c}
\put(200,90){d}
\put(140,40){e}
\put(205,-10){f}

\end{picture}[/math]
Heheh. I guess not.
LOWA

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Re: LaTeX and other markup!

Postby Fafnir43 » Wed May 07, 2008 1:52 am UTC

Hmm - is it just me, or has something interesting just been done to the LaTeX engine behind the scenes? Things seem to be rendered as text rather than images now, and for a brief period a few constructions (like [imath]\frac{\partial y}{\partial x}[/imath]) were borked...
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Re: LaTeX and other markup!

Postby ICDB » Wed May 07, 2008 2:23 am UTC

Simon wrote:Proper TeX fonts at the correct weighting for both Mac OS and Windows (i.e. properly adjusted for the respective different gammas) are available here; installing the right set for your machine will make the maths look just as good on any machine.

Ah I was using an old library computer vs. a newer mac, that probably made the difference.

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Re: LaTeX and other markup!

Postby ++$_ » Thu May 08, 2008 8:14 pm UTC

Any chance to add a few definitions?

In particular, an "\abs" control sequence (for vertical bars that automatically size themselves) would be nice:

\def\abs#1{{\left | #1 \right \vert}}

From my Plain TeX custom macros file on my machine, for the record.

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Re: LaTeX and other markup!

Postby Nimz » Fri May 23, 2008 4:07 am UTC

gmalivuk wrote:As many of you already know, the fora now have LaTeX support. This, combined with the [sup] and [sub] tags which have been around for awhile, should make it far easier to type math formulae. jsMath, which is what the new math and imath tags use, only works properly in the prosilver or prosilver_left styles. Sorry, subsilver adherents, but your favorite skin is no longer supported.

That said, does this excuse such things as "[imath]\{1,2\} < \{3,4\}[/imath] or [imath]\{3,4\} < \{1,2\}[/imath]" when it is simpler to write "{1,2} < {3,4} or {3,4} < {1,2}"? It renders just as well or better (e.g. unexpected failure of jsMath). And if you're assuming it's going to be a different size by putting it into [imath] tags, the font size tag is still simpler and more universal than imath, even among prosilver users.

Basically, can we have a policy of encouraging universal legibility? I don't suggest not using jsMath, as that would be mad. But I do suggest if something can be written using the typical characters on a keyboard without LaTeX, [math] and [imath] should be avoided.
LOWA

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Re: LaTeX and other markup!

Postby gmalivuk » Tue May 27, 2008 7:59 pm UTC

Yeah, I was actually going to say that things which could already be typed inline without any special tags, should still be posted that way. No need to increase rendering time and decrease the number of people who can read it correctly, when doing so accomplishes nothing of real benefit over typing it as normal.
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Re: LaTeX and other markup!

Postby Random832 » Fri Jun 20, 2008 7:29 pm UTC

Blackboard bold (i.e. ℤ Image for the integers) isn't supported (\mathbb just gives ordinary bold) is there any way to add support for that?

EDIT: it looks like this is what needs to be done.

Also - I've noticed that in some cases, what to do isn't obvious, and people don't seem to want to sift through that huge instruction page - I've started working on a "quick start guide" to doing math markup - would that be helpful to post here as a thread?

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Re: LaTeX and other markup!

Postby CFT » Sat Jun 21, 2008 8:58 am UTC

Random832 wrote:Blackboard bold (i.e. ℤ Image for the integers) isn't supported (\mathbb just gives ordinary bold) is there any way to add support for that?

Use \unicode{x????} for such fonts. For example \unicode{x2124} is [imath]\unicode{x2124}[/imath].
A page with useful codes is here: http://en.wikipedia.org/wiki/Letterlike_Symbols .

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Re: LaTeX and other markup!

Postby sh3l1 » Fri Nov 28, 2008 9:04 am UTC

[math]y=x/2[/math]
It seems that all it does on simple equations is make it italic. Oooh, italic. I must not know how to write up LaTex.

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Re: LaTeX and other markup!

Postby Mathmagic » Fri Nov 28, 2008 2:31 pm UTC

sh3l1 wrote:[math]y=x/2[/math]
It seems that all it does on simple equations is make it italic. Oooh, italic. I must not know how to write up LaTex.

You need to use actual TeX code, such as typing "y=\frac{x}{2}" (without the quotes, and in math tags) to get [imath]y=\frac{x}{2}[/imath]. I find myself referring to this site on a regular basis for TeX characters and the coding for them. :)
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Re: LaTeX and other markup!

Postby thinglie » Sun Dec 07, 2008 1:26 pm UTC

Is there a LilyPond parser available?

[math]\begin{lilypond}
\relative c'' {
a4 b c d
}
\end{lilypond}[/math]

Clearly, there needs to be.

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Re: LaTeX and other markup!

Postby gmalivuk » Mon Dec 08, 2008 2:51 pm UTC

To gauge actual demand for that, you could post about it in the Music forum.
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Re: LaTeX and other markup!

Postby Konstantin » Tue Feb 03, 2009 7:28 pm UTC

On an only tangentially related note, I need LaTeX for a class and it appears that quite literally every official mirror of it is down. Does forum code offer full LaTeX text setting support, or only the mathematics portion?

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Re: LaTeX and other markup!

Postby Random832 » Tue Feb 03, 2009 7:55 pm UTC

Konstantin wrote:On an only tangentially related note, I need LaTeX for a class and it appears that quite literally every official mirror of it is down. Does forum code offer full LaTeX text setting support, or only the mathematics portion?


Only math.

If you install almost any linux distribution you can probably load it from their package repositories.

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Re: LaTeX and other markup!

Postby Xv8M4g3r » Thu Feb 12, 2009 9:40 am UTC

[math]x_{1,2}=\frac{-b\pm\sqrt{\color{Red}b^2-4ac}}{2a}[/math]
Whys my colour only apply to the b?
Not the whole row? (b^2+4ac)
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Re: LaTeX and other markup!

Postby jestingrabbit » Thu Feb 12, 2009 9:44 am UTC

Xv8M4g3r wrote:[math]x_{1,2}=\frac{-b\pm\sqrt{\color{Red}b^2-4ac}}{2a}[/math]
Whys my colour only apply to the b?
Not the whole row? (b^2+4ac)

[math]x_{1,2}=\frac{-b\pm\sqrt{ \color{Red}{b^2-4ac}}}{2a}[/math]

Who the hell knows?
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Re: LaTeX and other markup!

Postby Xv8M4g3r » Thu Feb 12, 2009 11:51 am UTC

[math]x_{1,2}=\frac{-b\pm\sqrt{ \color{Red}{b^2-4ac}}}{2a}[/math]
Missed a space maybe? hmm cheers!
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Re: LaTeX and other markup!

Postby jestingrabbit » Thu Feb 12, 2009 1:02 pm UTC

Xv8M4g3r wrote:Missed a space maybe? hmm cheers!

[math]x_{1,2}=\frac{-b\pm\sqrt{\color{Red}{b^2-4ac}}}{2a}[/math]

Nope, that isn't the significant change that I made to your code.

[math]\color{Red}monkeys,\ \color{Red}{monkeys}[/math]
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Re: LaTeX and other markup!

Postby PM 2Ring » Wed Feb 25, 2009 11:32 am UTC

It appears that the forum software doesn't support the \binom tag. What's the preferred form for binomial coefficients here?

[imath]n \choose k[/imath] , [imath]{}^n \! \mathbf{C}_k[/imath] or [imath]{}_n \! \mathbf{C}_k[/imath] ?

I originally learned the 2nd form, though I'm quite familiar with the first form, and it's obviously the easiest to type.

I only noticed the last form quite recently, and FWIW I think it's ugly. :)

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Re: LaTeX and other markup!

Postby gmalivuk » Sat Feb 28, 2009 4:44 pm UTC

Pretty sure the first one is what basically everyone's been using since [math] tags were implemented in the first place.
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Re: LaTeX and other markup!

Postby Haeche » Sat May 02, 2009 9:23 pm UTC

[imath]\pi(x|y) = N\left(\mu_x + \frac{\sigma_{xy}}{\sigma_y^2}(y-\mu_y),\sigma_x^2(1-\rho_{xy}^2)\right)[/imath]

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Re: LaTeX and other markup!

Postby Haeche » Sat May 02, 2009 9:25 pm UTC

very nice. well... that was my first post. hallo folks

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Re: LaTeX and other markup!

Postby dinoian » Sun Aug 16, 2009 1:15 am UTC

I'm having some trouble with the \frac command when using LaTeXiT on my mac. I'm inputting:

Code: Select all

$g=\frac{2}{t_1+t_2} (\frac{D}{t_2} - \frac{d}{t_1})$


and getting the D/t_2-d/t_1 in the denominator next to t_1+t_2 and nothing in the numerator.

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Re: LaTeX and other markup!

Postby Talith » Sun Aug 16, 2009 3:13 am UTC

dinoian wrote:I'm having some trouble with the \frac command when using LaTeXiT on my mac. I'm inputting:

Code: Select all

$g=\frac{2}{t_1+t_2} (\frac{D}{t_2} - \frac{d}{t_1})$


and getting the D/t_2-d/t_1 in the denominator next to t_1+t_2 and nothing in the numerator.


Your code gives:

[math]g=\frac{2}{t_1+t_2} (\frac{D}{t_2} - \frac{d}{t_1})[/math]

is that not what you wanted?

if it looks something like

[math]g=\frac{2}{{t_1+t_2} (\frac{D}{t_2} - \frac{d}{t_1}})[/math]

then you've made a mistake with your bracing and need to correct that (it can get confusing with lots of nested braces).

double click on the typeset stuff above to see the LaTeX code.

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Re: LaTeX and other markup!

Postby dinoian » Sun Aug 16, 2009 3:37 am UTC

That is exactly what I wanted, but it is coming out like:
[math]g = 2 \frac{}{t_1+t_2 (\frac{D}{t_2}-\frac{d}{t_1})}[/math]

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Re: LaTeX and other markup!

Postby jestingrabbit » Sun Aug 16, 2009 4:03 am UTC

There'll be some white space in the "\frac{2}{" bit somewhere. Could be a tab, could be anything. Also, put a \left in front of your left bracket, and a \right in front of your right, like so

[math]\left(\frac{1}{2}\right)[/math]
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Re: LaTeX and other markup!

Postby MathChief » Tue Nov 03, 2009 12:55 am UTC

[math]\int_{\Omega} \Delta u dx = \int_{\partial \Omega} \frac{\partial u}{\partial \vec{n}} dS[/math]

some test
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Re: LaTeX and other markup!

Postby saxasm » Sat Feb 27, 2010 10:11 pm UTC

[math]t=\sqrt[3]{v+\dfrac{4}{3} \pi (6371+d)^3 \over {\dfrac{4}{3}\pi}}-6371-d[/math]


[math]v=(\dfrac{4}{3} \pi (6371+t+d)^3)-(\dfrac{4}{3} \pi (6371+d)^3[/math]

It seems to work well. I'm too lazy to figure out the third formula if you know t and v.. Also, first post. Hello. :)

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Re: LaTeX and other markup!

Postby antonfire » Thu Mar 11, 2010 1:58 pm UTC

Random832 wrote:Blackboard bold (i.e. ℤ Image for the integers) isn't supported (\mathbb just gives ordinary bold) is there any way to add support for that?
This is genuinely broken now. At the time of this writing, "\mathbb{Z}", [imath]\mathbb{Z}[/imath], gives the error "Unknown control sequence '\msbm'".

I can probably install fonts locally to make this go away (can I?), but that would hardly fix the problem of people being unable to read what I write.
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Re: LaTeX and other markup!

Postby gmalivuk » Thu Mar 11, 2010 8:31 pm UTC

In the meantime, putting ℤ in math tags gives the right character.
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Re: LaTeX and other markup!

Postby Mavrisa » Wed Apr 07, 2010 9:15 pm UTC

Simon wrote:Proper TeX fonts at the correct weighting for both Mac OS and Windows (i.e. properly adjusted for the respective different gammas) are available here; installing the right set for your machine will make the maths look just as good on any machine.


It looked pretty bad before I installed the fonts. After I installed the 25 font (I'm using a PC), it looked worse. 20 and 30 looked even worse. So I got rid of them altogether, and that seems to look the best... ?
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Re: LaTeX and other markup!

Postby bosecondensate » Tue Apr 13, 2010 12:38 am UTC

Testing support for xypic
[math]\xymatrix{T\times V\ar[r]^p\ar[dr]_i&T\otimes V\ar[d]^h\\&W[/math]

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Re: LaTeX and other markup!

Postby dotproduct » Mon May 03, 2010 11:34 pm UTC

It's not showing up right in preview, so I'll check if that's just the preview or if it's really not working.

<imath>\Delta^1_2</imath>


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