# How to split a very large latex line in Texmaker?

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1. Aug 3, 2013

### fluidistic

Hi guys, so I have a very large line of latex in texmaker. When i compile it icant read the right part of it. The latex code contains \left [ and \right ] part so i cant split it with  signs. Any idea? I also noticed that i have a huge unused left margin/edge in my whole document, despite having chosen article and a4paper as document type. So fixing this problem might fix the need to split the latex line. Thank you.

2. Aug 3, 2013

3. Aug 3, 2013

### fluidistic

Hmm I'm not really sure. Actually I realize I haven't been specific enough: I'm dealing with a mathematical line. This one:
$$\frac{\partial ^2 P}{\partial x^2}=\frac{1}{\sqrt{2\pi t} \sigma} \left [ \frac{1}{\sigma ^2 t} \exp \{ -\frac{(x+y-2B)^2}{2\sigma ^2 t} \} + \frac{(x-y)^2}{\sigma ^4 t^2} \exp \{ - \frac{(x-y)^2}{2\sigma ^2 t} \} -\frac{1}{\sigma ^2 t} \exp \{ - \frac{(x-y)^2}{2\sigma ^2 t} \} -\frac{(x+y-2B)^2}{\sigma ^4 t} \exp \{ -\frac{(x+y-2B)^2}{2\sigma ^2 t} \} \right ]$$ and it gets cut in the 3rd exponential term.
I tried to reduce the margin but the result is disastrous (it works for 0 cm margin but I can't use such a small margin!). So I really would like to split that line into 2.

4. Aug 3, 2013

### micromass

Like this?

\begin{align} & \frac{\partial ^2 P}{\partial x^2}=\frac{1}{\sqrt{2\pi t} \sigma} \left [ \frac{1}{\sigma ^2 t} \exp \{ -\frac{(x+y-2B)^2}{2\sigma ^2 t} \} + \frac{(x-y)^2}{\sigma ^4 t^2} \exp \{ - \frac{(x-y)^2}{2\sigma ^2 t} \}\right. \\ & \qquad \qquad \qquad \qquad \left. -\frac{1}{\sigma ^2 t} \exp \{ - \frac{(x-y)^2}{2\sigma ^2 t} \} -\frac{(x+y-2B)^2}{\sigma ^4 t} \exp \{ -\frac{(x+y-2B)^2}{2\sigma ^2 t} \} \right ] \end{align}

5. Aug 3, 2013

### fluidistic

Yes micromass, exactly.
However it returns 4 errors:
Code (Text):
! LaTeX Error: Environment align undefined.
Code (Text):
! Misplaced alignment tab character &.
Code (Text):
! Misplaced alignment tab character &.
Code (Text):
! LaTeX Error: \begin{document} ended by \end{align}.
Thanks guys for the help so far.

6. Aug 4, 2013

### micromass

$$\begin{eqnarray*} & & \frac{\partial ^2 P}{\partial x^2}=\frac{1}{\sqrt{2\pi t} \sigma} \left [ \frac{1}{\sigma ^2 t} \exp \{ -\frac{(x+y-2B)^2}{2\sigma ^2 t} \} + \frac{(x-y)^2}{\sigma ^4 t^2} \exp \{ - \frac{(x-y)^2}{2\sigma ^2 t} \}\right. \\ & &\qquad \qquad \qquad \qquad \left. -\frac{1}{\sigma ^2 t} \exp \{ - \frac{(x-y)^2}{2\sigma ^2 t} \} -\frac{(x+y-2B)^2}{\sigma ^4 t} \exp \{ -\frac{(x+y-2B)^2}{2\sigma ^2 t} \} \right ] \end{eqnarray*}$$

7. Aug 4, 2013

### fluidistic

This returns:
Code (Text):
! Display math should end with 2 dollar signs.
! Missing $inserted. ! Extra \endgroup. ! Display math should end with 2 dollar signs. ! Missing$ inserted.
! LaTeX Error: \begin{document} ended by \end{eqnarray*}.
! LaTeX Error: Too many columns in eqnarray environment.
! Extra alignment tab has been changed to \cr.
! Missing \endgroup inserted.
And what I did was writting 2 dollar signs, then your text (copied and pasted) and then 2 dollar signs. I tried with 1 dollar sign too, but I get errors too.

Edit: I also tried the example given in a paper about latex ($$\begin{eqnarray}\nonumber I_{00}&=& \frac{(2\pi)^3}{\alpha^{\prime 2}} \int d^6x \sqrt{-G}e^{-\Phi} \left[R_G+G^{MN} \partial_M\Phi\partial_N\Phi\right.\\ && \left.-\frac{1}{12}G^{MQ}G^{NR}G^{PS}H_{MNP}H_{QRS}\right] \end{eqnarray}$$) but I get the same errors.

Last edited: Aug 4, 2013
8. Aug 4, 2013

### D H

Staff Emeritus
In other words, you aren't using the AMS LaTeX package.

Use it.

9. Aug 4, 2013

### fluidistic

I see. I added \usepackage{amsmath} just before the \begin{document} line.
By trying micromass's first suggestion I get the error message:
Code (Text):
! Package amsmath Error: Erroneous nesting of equation structures;
And by trying his second suggestion I get more errors:
Code (Text):
! Missing \endgroup inserted.
! Extra alignment tab has been changed to \cr.
! LaTeX Error: Too many columns in eqnarray environment.
! LaTeX Error: \begin{document} ended by \end{eqnarray*}.
! Missing inserted. ! Display math should end with $$. ! Extra \endgroup. ! Missing inserted. ! Display math should end with$$. 10. Aug 4, 2013 ### D H Staff Emeritus Your error appears to result from doing something like this: Code (Text): \begin{align}<code omitted>\end{align} Don't do that. The align environment is a top-level command. You can't use it in math mode. Don't use $$, period. That's a plain TeX rather than LaTeX command. Until you can understand why this plain TeX code yields the Twelve Days of Christmas, it's best to steer clear of plain TeX: Code (Text): \let~\catcode~76~A13~F1~j00~P2jdefA71F~7113jdefPALLF PA''FwPA;;FPAZZFLaLPA//71F71iPAHHFLPAzzFenPASSFthP;A$$FevP A@@FfPARR717273F737271P;ADDFRgniPAWW71FPATTFvePA**FstRsamP AGGFRruoPAqq71.72.F717271PAYY7172F727171PA??Fi*LmPA&&71jfi Fjfi71PAVVFjbigskipRPWGAUU71727374 75,76Fjpar71727375Djifx :76jelse&U76jfiPLAKK7172F71l7271PAXX71FVLnOSeL71SLRyadR@oL RrhC?yLRurtKFeLPFovPgaTLtReRomL;PABB71 72,73:Fjif.73.jelse B73:jfiXF71PU71 72,73:PWs;AMM71F71diPAJJFRdriPAQQFRsreLPAI I71Fo71dPA!!FRgiePBt'el@ lTLqdrYmu.Q.,Ke;vz vzLqpip.Q.,tz; ;Lql.IrsZ.eap,qn.i. i.eLlMaesLdRcna,;!;h htLqm.MRasZ.ilk,% s;z zLqs'.ansZ.Ymi,/sx ;LYegseZRyal,@i;@ TLRlogdLrDsW,@;G
doTsW,Wk;Rri@stW aHAHHFndZPpqar.tridgeLinZpe.LtYer.W,:jbye

11. Aug 4, 2013

### fluidistic

Hmm what am I supposed to do with this strange-difficult looking code?

12. Aug 4, 2013

### micromass

Use my code, but don't put any \$ in front of it and in the end.

13. Aug 4, 2013

### fluidistic

That worked like a charm. Thanks a lot! Damn I feel stupid. XD

14. Aug 4, 2013

### fluidistic

By the way is there a way I can number such an equation? Apparently if I had used .$$.$$ the numbering would have been automatic.
However there's no numbering when I use .\begin{eqnarray*} .\end{eqnarray*}. (without the dots of course)
Edit: Removing the * signs in {eqnarray*} produces 2 numbering for each line of the single equation and the numbers are not placed enough on the right side (the (1) and (2) are basically placed inside the equation)

Last edited: Aug 4, 2013
15. Aug 5, 2013

### Pythagorean

16. Aug 20, 2013

### Hepth

You can choose a single line to show the equation number by putting /nonumber somewhere inside the other line.

This is archaic, and doesnt center the number, but I can't remember quickly the other way to do it I think it had to do with align.