# LaTeX Align at multiple points

#### ATY

So, I got the following problem: I want to write my equation the way you can see it in the picture:

I am actually running this:

\ begin{align}
\begin{split}
......
\ end{split}
\ end{align}

My problem is, that I can not set multiple align points. I need one point to attach the first 4 lines to the left side (because due to split they would otherwise go to the ride side), but the lines 5-8 look like they got aligned to the "+" from the first line.
How do I do this ? I hope that somebody can answer my question.

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#### ATY

ok, I tried it, but I got the following problem:
1. if I add a "&" at the beginning of every column to align the first 4 columns to the left side and additionally add an "&" before the "+" in the first column the program divides(?), because it thinks that I want to create a table.

2. if I do not use the "&" before at the beginning of the first 4 columns, I manage to align the lines 5-8 properly, but the first columns are suddenly alligned to the right side of my paper.

#### DrClaude

Mentor
Sorry, that was a bad idea.

Thinking about it some more, try using fantom:
Code:
\begin{align*}
& + \frac{(\Delta t^4)}{6} [ (\frac{b}{8} + \frac{c}{8} + d)  \\
& \hphantom{{} + \frac{(\Delta t^4)}{6} [} (\frac{3c}{8} + \frac{3d}{4})
\end{align*}
\begin{align*} & + \frac{(\Delta t^4)}{6} [ (\frac{b}{8} + \frac{c}{8} + d) \\ & \hphantom{{} + \frac{(\Delta t^4)}{6} [} (\frac{3c}{8} + \frac{3d}{4}) \end{align*}

ATY

#### ATY

this works fantastically :D
Thank you so much :)

#### wle

You can also use the IEEEeqnarray environment for this sort of thing (install the IEEEtrantools package and load with \usepackage[retainorgcmds]{IEEEtrantools}). There's a nice explanation at http://moser-isi.ethz.ch/docs/typeset_equations.pdf.

Code:
\begin{IEEEeqnarray*}{rCll}
y^{n + 1} &=& \IEEEeqnarraymulticol{2}{l}{
y^{n} + \Delta t \bigl[ (a + b + c + d) (f)_{t = t^{n}} \bigr]} \\
&& \IEEEeqnarraymulticol{2}{l}{+\> \dotsb} \\
&& +\> \frac{(\Delta t)^{4}}{6} \Biggl[ &
\biggl( \frac{b}{8} + \frac{c}{8} + d \biggr)
\biggl( \frac{\partial^{3} f}{\partial t^{3}}
+ 3 f \frac{\partial^{3} f}{\partial t^{2} \partial y}
+ 3 f^{2} \frac{\partial^{3} f}{\partial t \partial y^{2}}
+ f^{3} \frac{\partial^{3} f}{\partial y^{3}} \biggr)_{t = t^{n}} \\
&&& +\> \biggl( \frac{3c}{8} + \frac{3d}{4} \biggr)
\biggl( \frac{\partial^{2} f}{\partial t^{2}}
+ 2 f \frac{\partial^{2} f}{\partial t \partial y}
+ f^{2} \frac{\partial^{2} f}{\partial y^{2}} \biggr)_{t = t^{n}}
\biggl( \frac{\partial f}{\partial y} \biggr)_{t = t^{n}} \\
&&& +\> \dotsb \\
&&& +\> \biggl( \frac{3c}{4} + 3d \biggr)
\biggl( \frac{\partial f}{\partial t}
+ f \frac{\partial f}{\partial y} \biggr)_{t = t^{n}}
\biggl( \frac{\partial^{2} f}{\partial t \partial y} \biggr)_{t = t^{n}}
\Biggr] \\
&& \IEEEeqnarraymulticol{2}{l}{+\> \dotsb} \\
&& \IEEEeqnarraymulticol{2}{l}{
+\> \mathcal{O} \bigl( (\Delta t)^{6} f^{(5)} \bigr) \,.} \IEEEyesnumber
\end{IEEEeqnarray*}
Produces this:

Last edited:

"Align at multiple points"

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