Re: How do you pass two Octave functions to an .oct function?

[babelproofreader]

>I'd think these messages are pretty understandable.
>You simply can't pass a raw double * pointer (the local buffer) to
>feval, because it can't handle it. You need to create a valid
>octave_value from it. Declare rolling_vector as ColumnVector and it
>will likely work.

I have stripped my code down to the bare minimum, declared the input as
ColumnVector, and it still fails on compile. My revised code is 

#include <octave/oct.h>
#include <octave/dColVector.h>
#include <octave/parse.h>
     
DEFUN_DLD (rollingfft, args, , "Help String")
{
octave_value_list retval;
octave_value_list fft_result_vector;
octave_value_list ifft_result_vector;
octave_value_list real_result_vector;

 octave_function *fcn1 = args(0).function_value ();                             
  
// supply Octave "fft" function
 octave_function *fcn2 = args(1).function_value ();                             
  
// supply Octave "ifft" function
 octave_function *fcn3 = args(2).function_value ();                             
  
// supply Octave "real" function
 ColumnVector input_vector = args(3).column_vector_value ();
 ColumnVector output_vector = args(3).column_vector_value ();

 fft_result_vector = feval( fcn1 , input_vector );
 ifft_result_vector = feval( fcn2 , fft_result_vector ); 
 real_result_vector = feval( fcn3 , ifft_result_vector );
 retval = real_result_vector;                                                   
                     

return retval;                                                                  
     
}

and the error message is 

octave:1> mkoctfile rollingfft.cc
rollingfft.cc: In function ‘octave_value_list Frollingfft(const
octave_value_list&, int)’:
rollingfft.cc:18: error: no matching function for call to
‘feval(octave_function*&, ColumnVector&)’
/usr/include/octave-3.0.1/octave/parse.h:118: note: candidates are:
octave_value_list feval(const std::string&, const octave_value_list&, int)
/usr/include/octave-3.0.1/octave/parse.h:123: note:                
octave_value_list feval(octave_function*, const octave_value_list&, int)
/usr/include/octave-3.0.1/octave/parse.h:126: note:                
octave_value_list feval(const octave_value_list&, int)
 






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