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I have to use iopart document class. One of major problems which I came across is aligning multiple equations. For example, for reach

\begin{align}
  a & = b \label{eq1} \\
    c & = d \label{eq2}
\end{align}

we must use either amsmath package or other ones. Unfortunately, iopart does not coincide with it. In this situation how can I align my equations that have gotten me to stack?

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  • 1
    Could you please provide a complete (compilable) minimal example?
    – CarLaTeX
    Jun 29, 2019 at 7:27
  • 4
    Then try with older format, \begin{eqnarray}...\end{eqnarray}
    – MadyYuvi
    Jun 29, 2019 at 7:30

3 Answers 3

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6

You can use \usepackage{IEEEtrantools} to align multiple equations without to use amsmath package.

enter image description here

\documentclass[a4paper,12pt]{article}
\usepackage{IEEEtrantools}
\begin{document}
\begin{IEEEeqnarray}{lCr}
 a & = b \label{eq1} \\
c & = d \label{eq2}
\end{IEEEeqnarray}
\end{document}
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3
  • 1
    Can you help me to understand that the difference between general eqnarray and IEEEeqnarray?
    – MadyYuvi
    Jul 1, 2019 at 7:11
  • @MadyYuvi Hi. Your question is correct and I'll give you the correct explanations. If you go to pag. 8, you can read that The eqnarray-environment, however, has a few very severe disadvantages:; The spaces around the equality signs are too big. Particularly, they are not the same as in the multline-and equation-environments; The expression sometimes overlaps with the equation number even though there would be enough room on the left, etc.I suggest the tutorial guide.
    – Sebastiano
    Jul 1, 2019 at 19:24
  • 1
    Thanks a lot...
    – MadyYuvi
    Jul 2, 2019 at 4:29
4

You can use the package witharrows which provides an environment DispWithArrows which has by default exactly the same behaviour as the environment align of amsmath.

\documentclass{iopart}
\usepackage{witharrows}
\begin{document}
\begin{DispWithArrows}
  a & = b \label{eq1} \\
    c & = d \label{eq2}
\end{DispWithArrows}
\end{document}

Compilation of the code above

With DispWithArrows, you have the ability to add arrows on the right for explanations (hence the name):

\documentclass{iopart}
\usepackage{witharrows}
\begin{document}
\begin{DispWithArrows}
  a & = b \Arrow{explanation} \label{eq1} \\
    c & = d \label{eq2}
\end{DispWithArrows}
\end{document}

Compilation of the code above

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With mathenv (good old) package which significantly improve eqnarray environment (package is based on mdwtab's table handling macros).

\documentclass[a4paper,12pt]{article}
\usepackage{mathenv}

\begin{document}
    \begin{eqnarray}[rl]
a   & = b \label{eq1} \\
c   & = d \label{eq2}
    \end{eqnarray}
\end{document}

enter image description here

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  • My compliments for using an old but efficient package :-)
    – Sebastiano
    Jul 3, 2019 at 21:38

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