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How to write algorithm and pseudocode in Latex ?\usepackage{algorithm},\usepackage{algorithmic}

Friday 31 December 2010, by Nadir SOUALEM

Keywords: algorithm , algorithmic , Latex .

All the versions of this article: [English] [français]

We must use the following packages

\usepackage{algorithm}

\usepackage{algorithmic}

Here is an exemple:

\begin{algorithm}

\caption{Calculate $y = x^n$}

\begin{algorithmic} 

\REQUIRE $n \geq 0 \vee x \neq 0$

\ENSURE $y = x^n$

\STATE $y \leftarrow 1$

\IF{$n < 0$}

\STATE $X \leftarrow 1 / x$

\STATE $N \leftarrow -n$

\ELSE

\STATE $X \leftarrow x$

\STATE $N \leftarrow n$

\ENDIF

\WHILE{$N \neq 0$}

\IF{$N$ is even}

\STATE $X \leftarrow X \times X$

\STATE $N \leftarrow N / 2$

\ELSE[$N$ is odd]

\STATE $y \leftarrow y \times X$

\STATE $N \leftarrow N - 1$

\ENDIF

\ENDWHILE

\end{algorithmic}

\end{algorithm}

Here are useful commands

Single line statements

\STATE <text>

If-statements

\IF{<condition>} <text> \ENDIF



\IF{<condition>} <text> \ELSE <text> \ENDIF



\IF{<condition>} <text> \ELSIF{<condition>} <text> \ELSE <text> \ENDIF

For-loops

There are two forms

\FOR{<condition>} <text> \ENDFOR



\FORALL{<condition>} <text> \ENDFOR

While-loops

\WHILE{<condition>} <text> \ENDWHILE

Repeat until condition

\REPEAT <text> \UNTIL{<condition>}

Infinite loops

\LOOP <text> \ENDLOOP

Precondition

\REQUIRE <text>

Postcondition

\ENSURE <text>

Returning variables

\RETURN <text>

Printing variables

\PRINT <text>

Note: Due to a bug, the algorithmic package is not compatible with hyperref.

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