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I'm new to LaTeX. I'm using IEEEeqnarrayto align equations in my document (a compilation of solved problems), and I'd like to change equation numbering to (x,y) where x is the question number and y is the equation number (which resets with each question). Also I'd be using this within an enumerate environment, so I'd like the question number x to always match the item number.

If possible, please edit the sample below to make it work as described. I included the packages I'm using in my document to ensure compatibility. Thanks!

\documentclass[notitlepage]{article} \usepackage{amsmath,amssymb,amsthm,mathrsfs} \usepackage{IEEEtrantools,nccmath} \usepackage[margin=1in]{geometry} \begin{document} This is a test file for custom equation numbering. \begin{enumerate} \item The equations below should be labeled (1.1), unlabeled, and labeled (1.2), in order from top to bottom. \begin{IEEEeqnarray}{rCl} 1+1 & = & 2 \\ 1+2 & = & 3 \nonumber \\ 2+3 & = & 5 \end{IEEEeqnarray} \item The equations below should be labeled (2.1), unlabeled, and labeled (2.2), in order from top to bottom. \begin{IEEEeqnarray}{rCl} 3+5 & = & 8 \\ 5+8 & = & 13 \nonumber \\ 8+13 & = & 21 \end{IEEEeqnarray} \end{enumerate} \end{document}
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  • Welcome to TeX.SX! How should the equations be numbered outside of an enumerate environment? Commented May 16, 2020 at 0:43
  • @Vincent Thank you! I'm using an enumerate environment that covers my entire document, so there won't be any equations outside it that need to be numbered. Commented May 16, 2020 at 1:17

1 Answer 1

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You can use the command \numberwithin from amsmath. This command takes two arguments, both supposed to be counters. Using \numberwithin{<counter1>}{<counter2>} will reset <counter1> every time <counter2> is increased. It will also redefine how a number from <counter1> is displayed, representing it in the form "x.y", where x is the current <counter2> value, and y is the current <counter1> value.

The following example should work for your specific case.

\documentclass[notitlepage]{article} \usepackage{amsmath,amssymb,amsthm,mathrsfs} \usepackage{IEEEtrantools,nccmath} \usepackage[margin=1in]{geometry} \numberwithin{equation}{enumi} \begin{document} This is a test file for custom equation numbering. \begin{enumerate} \item The equations below should be labeled (1.1), unlabeled, and labeled (1.2), in order from top to bottom. \begin{IEEEeqnarray}{rCl} 1+1 & = & 2 \\ 1+2 & = & 3 \nonumber \\ 2+3 & = & 5 \end{IEEEeqnarray} \item The equations below should be labeled (2.1), unlabeled, and labeled (2.2), in order from top to bottom. \begin{IEEEeqnarray}{rCl} 3+5 & = & 8 \\ 5+8 & = & 13 \nonumber \\ 8+13 & = & 21 \end{IEEEeqnarray} \end{enumerate} \end{document}

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  • I think this will work, but what are the parameters of \numberwithin? Just in case I need to change something in the future Commented May 16, 2020 at 1:57
  • @FrancisGerardMagtibay I added some details in my answer, let me know if it's clearer now. Commented May 16, 2020 at 2:11
  • @FrancisGerardMagtibay No problem! :) To get used to the mechanics of the site, you could visit the help center, for example here. Commented May 16, 2020 at 3:28

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