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<h3 class="section">22.3 Opening an existing ntuple file</h3>
<div class="defun">
— Function: gsl_ntuple * <b>gsl_ntuple_open</b> (<var>char * filename, void * ntuple_data, size_t size</var>)<var><a name="index-gsl_005fntuple_005fopen-1964"></a></var><br>
<blockquote><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—this is used to copy
ntuples in and out of the file.
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