Rank: 989 based on 69 downloads (last 30 days) and 6 files submitted
photo

Gylson Thomas

E-mail
Company/University
MES College of Engineering, Kuttippuram,Kerala, India

Personal Profile:
Professional Interests:

 

Watch this Author's files

 

Files Posted by Gylson View all
  • 1 - 5 of
  • 6
Updated   File Tags Downloads
(last 30 days) 		Comments Rating
14 Nov 2007 Fast 2D Walsh-Hadamard Transform The function implement the 2D dyadic(Paley) ordered fast in-place Walsh-Hadamard transform. Author: Gylson Thomas transforms, walsh transform2d, dyadic, paley, signal processing, pat 14 1
  • 4.0
4.0 | 1 rating
14 Nov 2007 Fast Walsh-Hadamard Transform The function implement the sequency(Walsh) ordered fast Walsh-Hadamard transform. Author: Gylson Thomas transforms, 1d, fast, hadamard, walsh transform, sequency 34 8
  • 4.33333
4.3 | 12 ratings
05 Dec 2006 Radix2 decimation in time 1D fast Fourier transform FFT The function implement the 1D radix2 decimation in time fast Fourier transform FFT algorithm Author: Gylson Thomas fast fourier transfor..., spectral analysis 10 2
  • 4.0
4.0 | 1 rating
05 Dec 2006 natural (Hadamard) and dyadic (Paley) ordered fast Hadamard transform The function implement the 1D natural(Hadamard) and dyadic (Paley) ordered fast Hadamard transform. Author: Gylson Thomas transforms, fast hadamard transfo..., 1d, haramard, dyadic, paley 6 1
  • 5.0
5.0 | 1 rating
17 Mar 2005 Dyadic (Paley) Ordered Hadamard Matrix The function generates the dyadic (Paley) ordered Hadamard matrix. Author: Gylson Thomas application, hadamard matrix, dyadic, paley, image processing, sig 3 0
Comments and Ratings on Gylson's Files View all
  • 1 - 5 of
  • 24
Updated File Comment by Comments Rating
19 Nov 2011 Radix2 decimation in time 1D fast Fourier transform FFT The function implement the 1D radix2 decimation in time fast Fourier transform FFT algorithm Author: Gylson Thomas Alex

Or you can have a equation for W like:
W=exp(-i*2*pi*(k-1)/N);

norm(fftf(x)-fft(x)) works fine for me.
05 Apr 2011 Fast 2D Walsh-Hadamard Transform The function implement the 2D dyadic(Paley) ordered fast in-place Walsh-Hadamard transform. Author: Gylson Thomas victorp

Hi Gylson,

 I'm trying to use your implementation to convert a gray-scale image (e.g., Lena). Unfortunately, i receive as output a matrix with ALL elements zero!
Could you clarify this?
Regards,
Victor

11 Aug 2009 Fast Walsh-Hadamard Transform The function implement the sequency(Walsh) ordered fast Walsh-Hadamard transform. Author: Gylson Thomas Becker, Stephen

As of R2008b, Matlab's Signal Processing toolbox has the functions "fwht" and "ifwht" for the Fast Walsh-Hadamard (aka Hadamard) Transform, and you can choose among three different orderings. This builtin code doesn't work on very large vectors though, whereas I know it is possible to operate on these large vectors because a friend gave me some mex code that does just that. I haven't compared with the file posted here.
27 Aug 2008 Fast Walsh-Hadamard Transform The function implement the sequency(Walsh) ordered fast Walsh-Hadamard transform. Author: Gylson Thomas A-Mohammed, Saifuldeen
26 Aug 2008 Radix2 decimation in time 1D fast Fourier transform FFT The function implement the 1D radix2 decimation in time fast Fourier transform FFT algorithm Author: Gylson Thomas chamy, mari
Top Tags Applied by Gylson
  • 1 - 5 of
  • 21
dyadic, paley, transforms, 1d, application
Files Tagged by Gylson View all
  • 1 - 5 of
  • 6
Updated   File Tags Downloads
(last 30 days) 		Comments Rating
14 Nov 2007 Fast 2D Walsh-Hadamard Transform The function implement the 2D dyadic(Paley) ordered fast in-place Walsh-Hadamard transform. Author: Gylson Thomas transforms, walsh transform2d, dyadic, paley, signal processing, pat 14 1
  • 4.0
4.0 | 1 rating
14 Nov 2007 Fast Walsh-Hadamard Transform The function implement the sequency(Walsh) ordered fast Walsh-Hadamard transform. Author: Gylson Thomas transforms, 1d, fast, hadamard, walsh transform, sequency 34 8
  • 4.33333
4.3 | 12 ratings
05 Dec 2006 Radix2 decimation in time 1D fast Fourier transform FFT The function implement the 1D radix2 decimation in time fast Fourier transform FFT algorithm Author: Gylson Thomas fast fourier transfor..., spectral analysis 10 2
  • 4.0
4.0 | 1 rating
05 Dec 2006 natural (Hadamard) and dyadic (Paley) ordered fast Hadamard transform The function implement the 1D natural(Hadamard) and dyadic (Paley) ordered fast Hadamard transform. Author: Gylson Thomas transforms, fast hadamard transfo..., 1d, haramard, dyadic, paley 6 1
  • 5.0
5.0 | 1 rating
17 Mar 2005 Dyadic (Paley) Ordered Hadamard Matrix The function generates the dyadic (Paley) ordered Hadamard matrix. Author: Gylson Thomas application, hadamard matrix, dyadic, paley, image processing, sig 3 0

Contact us at files@mathworks.com