Math & Science ⇒ align and multline

[omkardpd]

Hi,

I am arranging two equations under "align". The first one being too long has to be fit on two lines. The second can be fit in one line. However, I can not use "multline" under "align" for the first equation. If I write both equations under different "align" commands, the printing is not coming out that good. Can I use a single "align" under which print one equation on multiple lines and other as it is?

Thank you,

Omkar

[phi]

You can use the split environment for multi-line equations with alignment. Another options is provided by the multlined environment in the mathtools package.

[helpless]

hi everyone,

my problem is that i am trying to splilt up an equation that is surrounded by \exp{...}. as far as i see, i cannot put any \\ in between this braces....
this is how my code looks like...

Code: Select all

\begin{align*}
 \exp\left\{-\frac{1}{2(1-\rho^2)\sigma_1^2} \sum_{i=1}^n x_i^2 + \frac{\mu(\sigma_2-\rho(n-1)\sigma_1)}  {(1-\rho^2)\sigma_1^2 \sigma_2} \sum_{i=1}^n x_i + \frac{\rho}{(1-\rho^2)\sigma_1\sigma_2} \underset{i\neq j}{\sum_{i=1}^n\sum_{j=1}}x_i y_j  \\ 
+ \frac{\mu(\sigma_1-\rho(n-1)\sigma_2)}{(1-\rho^2)\sigma_1 \sigma_2^2}  \sum_{j=1}^n y_j  - \frac{1}{2(1-\rho^2)\sigma_2^2} \sum_{j=1}^n y_j^2  \right\}
\end{align*}

i would really appreciate any help!

[localghost]

The combination of left and right delimiters doesn't work this way. You have to supplement your code by a pair of invisible delimiters.

Code: Select all

\begin{align*}
\exp\left\{-\frac{1}{2(1-\rho^2)\sigma_1^2} \sum_{i=1}^n x_i^2 + \frac{\mu(\sigma_2-\rho(n-1)\sigma_1)}  {(1-\rho^2)\sigma_1^2 \sigma_2} \sum_{i=1}^n x_i + \frac{\rho}{(1-\rho^2)\sigma_1\sigma_2} \underset{i\neq j}{\sum_{i=1}^n\sum_{j=1}}x_i y_j \right. \\
\left. + \frac{\mu(\sigma_1-\rho(n-1)\sigma_2)}{(1-\rho^2)\sigma_1 \sigma_2^2}  \sum_{j=1}^n y_j  - \frac{1}{2(1-\rho^2)\sigma_2^2} \sum_{j=1}^n y_j^2 \right\}
\end{align*}

But this looks not very good because the closing brace appears smaller. This way of adjusting delimiters works automatically and so depends on the enclosed contents. But you can adjust the delimiters manually.

Code: Select all

\begin{align*}
\exp\Biggl\{-\frac{1}{2(1-\rho^2)\sigma_1^2} \sum_{i=1}^n x_i^2 + \frac{\mu(\sigma_2-\rho(n-1)\sigma_1)}  {(1-\rho^2)\sigma_1^2 \sigma_2} \sum_{i=1}^n x_i + \frac{\rho}{(1-\rho^2)\sigma_1\sigma_2} \underset{i\neq j}{\sum_{i=1}^n\sum_{j=1}}x_i y_j  \\
+ \frac{\mu(\sigma_1-\rho(n-1)\sigma_2)}{(1-\rho^2)\sigma_1 \sigma_2^2}  \sum_{j=1}^n y_j  - \frac{1}{2(1-\rho^2)\sigma_2^2} \sum_{j=1}^n y_j^2 \Biggr\}
\end{align*}

More information about typesetting complex math expressions is listed in "Math mode".


Best regards
Thorsten¹

[helpless]

perfect! a thousand thanks !