> The matter is that I have limited space to store several .hdf files with
> both imaginary and real part. I need to know how to get the result with
> only real part by C++.
>  
> Thanks!
>

Look into output_hdf5 method declaration in meep.hpp (line 863 in Meep
0.20.3:
  void output_hdf5(const char *dataname,  // OUTPUT COMPLEX-VALUED FUNCTION
                   int num_fields, const component *components,
                   field_function fun, void *fun_data_,
                   const geometric_volume &where,
                   h5file *file = 0,
                   bool append_data = false,
                   bool single_precision = false,
                   const char *prefix = 0,
                   bool real_part_only = false);

I think the last parameter will solve your problem :)

-- 
Regards,
Pawel Smolinski
Faculty of the Fundamental Problems of Technology
Wroclaw University of Technology, Poland

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