Re: A question about programming using dynamically linked function

[David Bateman]

According to address@hidden <address@hidden> (on 06/01/04):
> Hi
> 
> I am writing dynamically linked functions. In my function, I
> need to copy the data from a complex matrix (in octave_value
> type) to a double buffer. I was wondering if there is a way to
> find a pointer to the real data in the complex matrix (in
> octave_value type), so that I can use memcpy to copy it to my
> own buffer. The similar function can be found in MATLAB which
> is mxGetPr. Does Octave have similar functions like mxGetPr?


You want the pointer to the raw data? Then in this case something
like

DEFUN_DLD (foo, args, , "help message") {
  int nargin = args.length ();
  for (int i=0; i < nargin; i++) {
    <snip> 

    if (args(i).is_complex_type()) {
      ComplexMatrix a = args(i).complex_matrix_value();
      Complex *vec = a.fortran_vec ();
      <snip>
    }
  }
}

But the pointer is of type "Complex" and not "double".. Is this what you
were after?

regards
D.



> 
> Thanks a lot!
> 
> Jia
> __
> 
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David Bateman                                address@hidden
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