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Next: <a href="Writing-ntuples.html#Writing-ntuples" accesskey="n" rel="next">Writing ntuples</a>, Previous: <a href="Creating-ntuples.html#Creating-ntuples" accesskey="p" rel="previous">Creating ntuples</a>, Up: <a href="N_002dtuples.html#N_002dtuples" accesskey="u" rel="up">N-tuples</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<h3 class="section">24.3 Opening an existing ntuple file</h3>

<dl>
<dt><a name="index-gsl_005fntuple_005fopen"></a>Function: <em>gsl_ntuple *</em> <strong>gsl_ntuple_open</strong> <em>(char * <var>filename</var>, void * <var>ntuple_data</var>, size_t <var>size</var>)</em></dt>
<dd><p>This function opens an existing ntuple file <var>filename</var> for reading
and returns a pointer to a corresponding ntuple struct. The ntuples in
the file must have size <var>size</var>.  A pointer to memory for the current
ntuple row <var>ntuple_data</var> must be supplied&mdash;this is used to copy
ntuples in and out of the file.
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