# Page numbering different side of heading for odd and even page

Hello I am using a fancyhdr package and I want that the page number appear in the right side of the heading for odd pages and in the left side of the heading for the left side. I alredy used the command \fancyhead[RO,LE]{\thepage} but it does not work. Here is my code:

\documentclass[twoside,12pt]{elsarticle}%
\usepackage{amscd}
\usepackage{thmdefs}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{fancyhdr}
\usepackage[margin=0.5in]{geometry}
\setcounter{MaxMatrixCols}{30}
\providecommand{\U}[1]{\protect\rule{.1in}{.1in}}
\numberwithin{equation}{section}
\newenvironment{proof}[1][Proof]{\noindent\textbf{#1.} }{\ \rule{0.5em}{0.5em}}
\newtheorem{condition}[theorem]{Condition}

\journal{}

\pagestyle{fancy}
\newcommand\shorttitle{------------------------------}
\newcommand\authors{--------------------------}
\fancyhf{}
\renewcommand\headrulewidth{0pt}
\fancyhead[C]{%
\ifodd\value{page}
\small\scshape\authors
\else
\small\scshape\shorttitle
\fi }

\fancyhead[RO,LE]{\thepage}

\begin{document}
HELLO!!!!
\end{document}


I think it is something related to the class elsarticle, because if I change to another the class everything works well.

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If you're submitting an article to an Elsevier journal, they will override such settings before it is published. If you're not, why not use another document class? –  Christoph B. Apr 19 at 19:12
Welcome to TeX.sx! –  mafp Apr 19 at 19:19
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