Opening an existing ntuple file - GNU Scientific Library -- Reference Manual
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### 23.3 Opening an existing ntuple file

— Function: gsl_ntuple * gsl_ntuple_open (char * filename, void * ntuple_data, size_t size)

> This function opens an existing ntuple file filename for reading and returns a pointer to a corresponding ntuple struct. The ntuples in the file must have size size. A pointer to memory for the current ntuple row ntuple_data must be supplied—this is used to copy ntuples in and out of the file.

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