fttconv2

[Patrick Dupre]

Hello,

I get the following error:

error: feval: function 'fftconv2' not found

octave-image provide fftconv2.m

can I use it? If yes, How?

Thanks

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 Patrick DUPRÉ                                 | | email: [e-mail]
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[stan]

On Mon, 17 Jan 2022 22:58:11 +0100
Patrick Dupre  wrote:
> Hello,
>
> I get the following error:
>
> error: feval: function 'fftconv2' not found
>
> octave-image provide fftconv2.m
>
> can I use it? If yes, How?

Not enough information.  What program is giving the error?  Where does
it think it should be getting this function from?  Is that dependency
installed?  I don't know what fftconv2.m is, but unless the program
that is giving the error knows how to use that api, it seems unlikely.
If octave-image knows how to use that, you might be able to research
what services it provides and see if they can do what you were trying
to do with the original program.

I don't know anything about octave-image, so this is just general debug
procedure.

[George N. White III]

On Mon, 17 Jan 2022 at 17:59, Patrick Dupre  wrote:
> Hello,
>
> I get the following error:
>
> error: feval: function 'fftconv2' not found
>
> octave-image provide fftconv2.m
>
> can I use it? If yes, How?

Are you trying to use octave's fftconv2 function?  In Fedora35 with octave
and octave-image installed using dnf:

octave:8> pkg load image
pkg load image
octave:9> help fftconv2
help fftconv2
'fftconv2' is a function from the file
/usr/share/octave/packages/image-2.12.0/fftconv2.m

-- Function File: fftconv2 (A, B)
 -- Function File: fftconv2 (V1, V2, A)
 -- Function File: fftconv2 (..., SHAPE)
     Convolve 2 dimensional signals using the FFT.

This method is faster but less accurate than CONV2 for large A and
     B.  It also uses more memory.  A small complex component will be
     introduced even if both A and B are real.

See also: conv2, fftconv, fft, ifft.

[George N. White III]

On Wed, 19 Jan 2022 at 03:44, Patrick Dupre  wrote:
> Yes, exactly.
> Actually the package * FFTConvolution
> https://github.com/jeremyfix/FFTConvolution call fftconv2 (*
> https://github.com/jeremyfix/FFTConvolution)
>
> In convolution_benchmark.cc
> feval ("fftconv2", functionArguments, 1);
>
> but, I get
> error: feval: function 'fftconv2' not found
>
> I do not know how to call the octave function from a c++ program.
> It is because a library si not linked?

The convolution_benchmark.cc was last updated in 2013.  Octave has changed
a lot
since then.
> The author of the package (jeremy.fix) did not answer to my request.

Can't really blame someone for not keeping on top of old projects.   Wonder
if someone
has forked the code.
> *Sent:* Tuesday, January 18, 2022 at 9:33 PM
> *From:* "George N. White III" 
> *To:* "Community support for Fedora users" 
> *Subject:* Re: fttconv2
> On Mon, 17 Jan 2022 at 17:59, Patrick Dupre  wrote:
> > Hello,
> >
> > I get the following error:
> >
> > error: feval: function 'fftconv2' not found
> >
> > octave-image provide fftconv2.m
> >
> > can I use it? If yes, How?
>
> Are you trying to use octave's fftconv2 function?  In Fedora35 with octave
> and octave-image installed using dnf:
>
> octave:8> pkg load image
> pkg load image
> octave:9> help fftconv2
> help fftconv2
> 'fftconv2' is a function from the file
> /usr/share/octave/packages/image-2.12.0/fftconv2.m
>
> -- Function File: fftconv2 (A, B)
>  -- Function File: fftconv2 (V1, V2, A)
>  -- Function File: fftconv2 (..., SHAPE)
>      Convolve 2 dimensional signals using the FFT.
>  This method is faster but less accurate than CONV2 for large A and
>  B.  It also uses more memory.  A small complex component will be
>  introduced even if both A and B are real.
>
>  See also: conv2, fftconv, fft, ifft.
>
>
>
> --
> George N. White III
>
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