I have the following main tex file and I wish to place the \usepackage commands in a different usepackage.tex file and compile it on main tex file. How can I do that. I tried but keep getting error as if it does not know where to find the file usepackages. (Pardon me for the messy packages, I know it is a disaster, I am trying to fix it now.)

\usepackage{enumerate}% http://ctan.org/pkg/enumerate
\newcommand\swb{{\scriptstyle\Box}} % "small white box"
\usepackage{upgreek} %use uptau greek letter
\usepackage{comment} %choose parts not to compile
\tikzset{mynode/.style={fill=white,text=black,font=\tiny,inner sep=1pt}}
\newenvironment{numberlists}[1][3\parindent] %for long numberlist command
  \begingroup\lccode`~=`,\lowercase{\endgroup\def~}{\mathcomma\penalty0 }%
  \thinmuskip=6mu plus 6mu minus 2mu
\mathchardef\mathcomma=\mathcode`, %end of numberlist command
\setlength{\oddsidemargin}{-1in}   \setlength{\evensidemargin}{-1in}
\setlength{\marginparwidth}{40pt} \setlength{\marginparsep}{10pt}
\setlength{\topmargin}{-5mm}      \setlength{\headsep}{0.5in}
\setlength{\textheight}{227mm}    \setlength{\textwidth}{165mm}
\renewcommand\floatpagefraction{0.8} %   Default = 0.5

\allowdisplaybreaks % allow page breaks
\includegraphics[width=0.70\textwidth]{logo} \\[2cm]

{ \large \bfseries Perfect Triangles : Rational points on Elliptic Curves }\\
Shahrina Ismail \\
\{Candidate's academic degrees\} \\[7cm]
{\em A thesis submitted for the degree of Doctor of Philosophy at\\
The University of Queensland in 2016} \\
School of Mathematics and Physics









\chapter{Background and Methodology}\label{chap:2}

\chapter{Values of $\delta(\mu)$}\label{chap:3}

  • @Mico. Sorry I will edit this. I actually has already deleted that instruction. – shahrina ismail Nov 19 '16 at 10:17
  • 1
    Move all the code lines that you want in a preamble.tex file and than put \input{preamble.tex} in your main file. – CarLaTeX Nov 19 '16 at 10:19
  • @CarLaTeX. Thank you it worked. the mistake i did before this was that I placed the premable.tex in the chapters folder, but wrote \input{preamble.tex} – shahrina ismail Nov 19 '16 at 10:27
  • 1
    You're welcome! Indeed \input{somefile.tex} can be put everywhere, but if somefile.tex contains \usepackage{...} must be put before \begin{document}. – CarLaTeX Nov 19 '16 at 10:32
  • apart from placing it in a file, don't load epsfig, don't load both enumerate and enumitem , your \floatpagefraction setting looks a very strict default, makes it very hard for latex to avoid sending all floats to the end of the document. (if you have two consecutive floats both 75% of page height then it will be impossible to set any floats and they will all stack up until flushed by \clearpage) It's a bad habit to use numbers in labels like \label{chap:3} (even though it works), not need to load amsmath if you have mathtools (which you have twice) also have booktabs twice – David Carlisle Nov 19 '16 at 12:19

I suggest you

  • Place all preamble instructions -- other than the \documentclass instruction, of course -- in a separate file, to be called (say) sharina.sty. (Note the filename extension). Save the file in the directory where your main tex file is located.

  • Place the single instruction


    in the preamble of your tex file. Observe: No filename extension.

    With this change, the document preamble should consist of only the following two lines:


Then, do please take the time to clean up and simplify the instructions contained in the file sharina.sty.

| improve this answer | |
  • Thank you so much Mico. This worked so well. And sharina.sty really really need some grooming.. Thanks again. – shahrina ismail Nov 19 '16 at 10:29
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    Or even a class can be made sharina-thesis.cls. Then the document just starts with \documentclass{sharina-thesis}\begin{document}. Both the package solution and the class solution have the advantage, that options can implemented for the case, the document needs processing with different settings. – Heiko Oberdiek Nov 19 '16 at 10:34

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