General ⇒ numberwithin

[cb2001]

hi,

i have problem with the latex command \numberwithin. i use it in combination with the algorithm package to set the numbering of all algorithms to the chapter level:

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usepackage{algorithmic}
\usepackage[boxed]{algorithm}
\numberwithin{algorithm}{chapter}

...

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\begin{algorithm}                      % enter the algorithm environment
\label{alg:algo}            % and a label for \ref{} commands later in the document
\underline{Objective} \\[10pt] bla.\\[10pt]
\caption{some algorithm} % caption
\end{algorithm}

now if i refer to this algorithm somewhere else in the document using

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\ref{alg:algo}

, latex uses the section counter instead of the actual algorithm numbering.
that means for example if the i add the algorithm inside section 2.5.1.2, which obviously is in chapter 2, the algorithm box correctly displays "Algorithm 2.1" but the reference (Algorithm \ref{alg:algo}) to the algorithm is displayed as "Algorithm 2.5.1.2".

Can anyone please give me a hand to solve this?

[Stefan Kottwitz]

Hi cb2001,

welcome to the board!
Just use \label after \caption, not before.

Stefan

[cb2001]

wow, that was fast!
thanks for the quick reply, and thanks for the help ... works like a charm!