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Mallat algorithm and Wavelet Transform dwt (a, n, f,)

ptc-3011558
1-Newbie
1-Newbie
‎Nov 27, 2009 09:24 AM
‎Nov 27, 2009 09:24 AM

Mallat algorithm and Wavelet Transform dwt (a, n, f,)

I have been employing the Mathcad function dwt(a,n,f,[o,[i]]), which is included in the Wavelet Extension Pack. When I tried to compare the results obtained with this function with those obtained by means of the Mallat algorithm, they differ. In particular, the transform coefficients differ. Does anybody know in detail how the matrix algorithm is implemented in the Mathcad function dwt(a,n,f)?
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RichardJ
19-Tanzanite
19-Tanzanite
(To:ptc-3011558)
‎Nov 27, 2009 10:02 AM
‎Nov 27, 2009 10:02 AM

It states in the Wavelets ebook that it uses the pyramid algorithm, which I believe is Mallat's algorithm. Have you to compared to the dwts and dwti functions to see if it's a question of boundary conditions? Richard
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ptc-3011558
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1-Newbie
(To:RichardJ)
‎Nov 28, 2009 10:38 AM
‎Nov 28, 2009 10:38 AM

"Richard Jackson" wrote:

It states in the Wavelets ebook that it uses the pyramid algorithm, which I believe is Mallat's algorithm. Have you to compared to the dwts and dwti functions to see if it's a question of boundary conditions? Richard

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