Math & Science ⇒ problem: right bracket "]" does not appear

[greenfalcon]

hello everyone,

i am new to the forum and haven't become very femiliar with latex, yet

i would like to get an equation that looks like that: (see uploaded picture at the bottom)

what i did now, is this:

Code: Select all

\begin{eqnarray}
  L & = & \sum_{t=0}^{\infty} \beta^t \left[ \left( log(C_t) + \theta  \frac{M_t}{P_t} +V\left( \bar{N} - N_t \right)  \right) \\
  & & {} +  \lambda_t \left( \frac{W_t}{P_t} N_t + \kappa_t I_{t-1} + \mu_t \frac{M_{t-1}}{P_t} - C_t - \frac{M_t}{P_t} - I_t  \right)\right]  \\
  
\end{eqnarray}

it does look pretty close: (the upper picture)

now, there are two things, that really puzzle me:

1) where is the bracket "]" at the very end? it is part of the code, but it doesnt appear in the pdf output

2) where do the (3) and (4) come from? this is really surprising to me...

thank you very much

[php1ic]

Don't use eqnarray, instead use the align environment provided by the amsmath package. See the link in this thread for why not to use eqnarray.

http://www.latex-community.org/forum/vi ... =46&t=8525

The code you gave doesn't compile for me as you don't have matching brackets on each line. This is probably why you don't get the right "]".

I can't see why you have (3) and (4), I guess it is something to do with the unnecessary line break followed by the blank line. I guess eqnarray simply puts a number on every line.

Anyway, as I said, the align environment will do what you want.

Code: Select all

\documentclass{article}

\usepackage{amsmath}

\begin{document}

\begin{align}
  L & =  \sum_{t=0}^{\infty} \beta^t \biggl[ \left( log(C_t) + \theta  \frac{M_t}{P_t} +V\left( \bar{N} - N_t \right)  \right) \notag\\
  & \quad + \lambda_t \left( \frac{W_t}{P_t} N_t + \kappa_t I_{t-1} + \mu_t \frac{M_{t-1}}{P_t} - C_t - \frac{M_t}{P_t} - I_t  \right)\biggr]
\end{align}

\end{document}

[greenfalcon]

thank you very much for your help!

that works perfectly

by the way, is there a way to get the (1) to move between the two lines?

thank you

[php1ic]

You can use the split environment (also provided by amsmath) which goes inside the equation environment. Looks like this is what you were looking for to start with, as it seems to be designed for single equations that are too long for a line.

Code: Select all

\documentclass{article}

\usepackage{amsmath}

\begin{document}

\begin{equation}
\begin{split}
  L & =  \sum_{t=0}^{\infty} \beta^t \biggl[ \left( log(C_t) + \theta  \frac{M_t}{P_t} +V\left( \bar{N} - N_t \right)  \right)\\
  & \quad + \lambda_t \left( \frac{W_t}{P_t} N_t + \kappa_t I_{t-1} + \mu_t \frac{M_{t-1}}{P_t} - C_t - \frac{M_t}{P_t} - I_t  \right)\biggr]
\end{split}
\end{equation}

\end{document}

[greenfalcon]

ah, okay, you can do it with {split}

thank you very much!