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I use the following:

\documentclass{article}
\usepackage{algpseudocode}
\usepackage{algorithm}
\usepackage{textcomp}
\usepackage{mathtools}


\date{\today}
\title{Some Title}


\begin{document}
    \section{Introduction}
    bla afdsdjkh
    \begin{algorithm}
        \caption{Caption}
        \textbf{INPUT:} Some input\\
        \textbf{OUTPUT:} Some Output
        \begin{algorithmic}
       \State Function $UpdateNodes($x$)$:
       \State   Set $AED_i$ = $\sum_{j=1}^{n}$  $DM_i_j$ / $n$  
                \end{algorithmic}
            \end{algorithm} 
        \end{document}

Although I get the required result for the line:

\State  Set $AED_i$ = $\sum_{j=1}^{n}$  $DM_i_j$ / $n$  

I get an error message:

"Double subscript. ...ate Set $AED_i$ = $\sum_{j=1}^{n}$ $DM_i_"

Why do I get it? and how can I fix it?

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1  
You should type $\mathit{AED}_{i}=\sum_{j=1}^{n}\mathit{DM}_{i_j}/n$, not going in and out from math mode. – egreg Jan 19 at 8:57

Perhaps, instead of $DM_i_j$ you need to type $DM_{i_j}$ or ${DM_i}_j$ depending of what you have in mind.

share|improve this answer
6  
...or $D_{ij}$... – Werner Jan 19 at 6:40

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