Environment bmatrix undefined. \begin{bmatrix} in Latex

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I also added amsmath package but that didn't seem to help. What could be the problem?

The instruction

\usepackage{amsmath, xparse}

has to earlier in the preamble. It should be executed immediately after \usepackage{booktabs} at the latest.

Why? Because the preamble then redefines the macro \env@matrix and the environment bmatrix. Both are defined in the amsmath package. Unsurprisingly, LaTeX crashes if it's told to redefine something that hasn't been defined yet.

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Updated on August 01, 2022

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  • Admin
    Admin over 1 year

    I've been using this thisspringer format latex document and wanted to add a matrix in the paper and I've been bumping into this error for a while now.

    \documentclass[a4paper]{article}
    \usepackage{pdfpages}
    \usepackage{graphicx}
    \graphicspath{ {./imgs/} }
    \usepackage{changepage}% http://ctan.org/pkg/changepage
    \usepackage{lipsum}% http://ctan.org/pkg/lipsum
    \usepackage{booktabs}
    \makeatletter
    \renewcommand*\env@matrix[1][*\c@MaxMatrixCols c]{%
        \hskip -\arraycolsep
        \let\@ifnextchar\new@ifnextchar
        \array{#1}}
    
    \renewenvironment{bmatrix}
    {{\ifnum`}=0 \fi\left[\env@matrix}
    {\endmatrix\right]\ifnum`{=0 \fi}}
    \makeatother
    \usepackage{amsmath, xparse}
    \usepackage{mathtools}
    \newlength{\extratrim}
    \setlength{\extratrim}{10mm}
    \newcommand*{\trimexpr}[1]{\dimexpr(#1)+\extratrim\relax}
    
    
    gsave
    newpath
      20 20 moveto
      20 220 lineto
      220 220 lineto
      220 20 lineto
    closepath
    2 setlinewidth
    gsave
      .4 setgray fill
    grestore
    stroke
    grestore
    \end{filecontents*}
    %
    \RequirePackage{fix-cm}
    %
    %\documentclass{svjour3}                     % onecolumn (standard format)
    %\documentclass[smallcondensed]{svjour3}     % onecolumn (ditto)
    \documentclass[smallextended]{svjour3}       % onecolumn (second format)
    %\documentclass[twocolumn]{svjour3}          % twocolumn
    %
    \smartqed  % flush right qed marks, e.g. at end of proof
    %
    \usepackage{graphicx}
    %
     \usepackage{mathptmx}      % use Times fonts if available on your TeX system
    %
    % insert here the call for the packages your document requires
    %\usepackage{latexsym}
    % etc.
    %
    % please place your own definitions here and don't use \def but
    % \newcommand{}{}
    %
    % Insert the name of "your journal" with
    % \journalname{myjournal}
    %
    
    
    \begin{document}
    
    
    \title{Random titl}
    
    
    
    \author{me   \&     him }
    
    
    \institute{x x of x, \at
                    Institute of x Technology and Electronics \\
                 {}           %  \\
    %            
               \and
               x x 
                  x, yy
                  \and  \\
                  x x 
                  x, yy
    }
    
    \date{May 15th 2020}
    % The correct dates will be entered by the editor
    
    
    \maketitle
    
    \[
        \begin{bmatrix}
        1  2 \\ 
        2  3
        \end{bmatrix}
    \]
    
    
    
    
    \section{Summary}
    \section{Appendix}
    
    %\begin{acknowledgements}
    %If you'd like to thank anyone, place your comments here
    %and remove the percent signs.
    %\end{acknowledgements}
    
    
    % Authors must disclose all relationships or interests that 
    % could have direct or potential influence or impart bias on 
    % the work: 
    %
    % \section*{Conflict of interest}
    %
    % The authors declare that they have no conflict of interest.
    
    
    % BibTeX users please use one of
    %\bibliographystyle{spbasic}      % basic style, author-year citations
    %\bibliographystyle{spmpsci}      % mathematics and physical sciences
    %\bibliographystyle{spphys}       % APS-like style for physics
    %\bibliography{}   % name your BibTeX data base
    
    % Non-BibTeX users please use
    \begin{thebibliography}{}
    %
    % and use \bibitem to create references. Consult the Instructions
    % for authors for reference list style.
    %
    \bibitem{RefJ}
    % Format for Journal Reference
    Author, Article title, Journal, Volume, page numbers (year)
    % Format for books
    \bibitem{RefB}
    Author, Book title, page numbers. Publisher, place (year)
    % etc
    \end{thebibliography}
    
    \end{document}
    % end of file template.tex
    

    I get an error Environment bmatrix undefined. \begin{bmatrix}. I also added amsmath package but that didn't seem to help. What could be the problem?

    • Teepeemm
      Teepeemm over 3 years
      Plus turn this into a minimal working example. A TeX file shouldn't have two separate \documentclass commands, and you close a filecontents* environment that never opens. Also, what are you intending with renewcommand*\env@matrix and renewenvironment{bmatrix}?