Urgent...........matrix environment in IOP journal style

[Anglea]

Hi everyone,

I have been struggling of how to write a matrix format that is
accepted in IOP journal style. In the guide provided in their website
there is not example of matrix environment.

I tried with the
\documentclass[a4paper,showpacs]{iopart}
\usepackage{graphicx}
\usepackage{bm}

\bibliographystyle{iopart-num}
\begin{document}


\begin{equation}
\begin{bmatrix}
\psi(0) \\[0.3em]
\psi(a) \end{bmatrix}=\sum_{x'\in\{0,a\}}\left[G_{\mbox{\tiny
0}}(x,x';k)\mu(x')-\frac{\partial G_{\mbox{\tiny 0}}(x,x';k)}{\partial
n'}\psi(x')\right]_{x=0,a},
\end{equation}_________________________________________

This is the warning message,

/Paper.tex:58:Environment bmatrix undefined. \begin{bmatrix}
.Paper.tex:60:\begin{equation} on input line 57 ended by
\end{bmatrix}. \psi(a) \end{bmatrix}

I tried ti include the \usepackage{amssymb} so the matrix appear fine
but other equation have disappeared.

any help please??

[Kalidoss Murugesan]

I tried with the
\documentclass[a4paper,showpacs]{iopart}
\usepackage{graphicx}
\usepackage{bm}

\bibliographystyle{iopart-num}
\begin{document}

\begin{equation}
 \begin{bmatrix}
      \psi(0) \\[0.3em]
      \psi(a) \end{bmatrix}=\sum_{x'\in\{0,a\}}\left[G_{\mbox{\tiny
0}}(x,x';k)\mu(x')-\frac{\partial G_{\mbox{\tiny 0}}(x,x';k)}{\partial
n'}\psi(x')\right]_{x=0,a},
\end{equation}

 

\usepackage{amsmath} in the preamble
will solve this problem.

--
With regards,

M. Kalidoss,
+91 99949 05343