Math & Science ⇒ Alignment problem

[bazman]

Hi there,

I would like to know how to alter the following code so that the equals sign in both equations are aligned and that only one number appears for both equations.

Code: Select all

\documentclass{article} % Your input file must contain these two lines
\usepackage{natbib}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{bm}
\usepackage{grffile}
\usepackage{graphicx}
\usepackage[%
  font=small,
  labelfont=bf,
  figurewithin=section,
  tablewithin=section,
  tableposition=top
]{caption}
\numberwithin{equation}{section}

\makeatletter
  \def\env@matrix{\hskip -\arraycolsep
  \let\@ifnextchar\new@ifnextchar
  \array{*\c@MaxMatrixCols l}}
\makeatother

\begin{document} % plus the \end{document} command at the end
\parskip = 1pc %change spacing between paragraphs
\parindent = 0pc

\begin{align}
f_j(t)=X_j(f) + \alpha    \\   
dX_j(t)=\beta(t)X_j(t)dW_t  
\end{align}

\end{document}

[gmedina]

Hi,

you can use something like the following:

Code: Select all

\begin{align}
  \begin{split}
     f_j(t) &= X_j(f) + \alpha. \\   
    dX_j(t) &= \beta(t)X_j(t)dW_t .
  \end{split}
\end{align}

P.S.: in other threads we have suggested you to read basic documentation about typesetting mathematical expressions using LaTeX; please, act accordingly.

[localghost]

With a close look into the amsmath manual you would have found a solution by yourself.

Code: Select all

\begin{equation}\label{eqn:aligned}
  \begin{aligned}
    f_j(t)&=X_j(f)+\alpha \\
    dX_j(t)&=\beta(t)X_j(t)dW_t 
  \end{aligned}
\end{equation}

Package manuals are made for searching a solution. Another source for possible solutions is the search function of the forum.


Best regards
Thorsten

[bazman]

OK thanks.