R help - Jan 2006 - Filters in waveslim

Dear R Users,
 For running  wavelet functions using dwt( ), modwt( ), and mra( ), a wavelet
filter  algorithm is applied. For all these functions, default is
"la8" and  other possibility is "haar". In related
documents, another  possibilities like as symlet and coiflet ... are not cited.
  Besides "la8" and "haar", which wavelet filters can be
used?
  Thank you for any help,
  Amir Safari
  

		
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Using R, I believe only the Haar and Daubechies wavelets are available. 
wavethresh does allow for you to use different filter numbers with the
Daubechies wavelets that I think you cannot do using waveslim.  You can do
cross-validation to find the best fit across different filter niumbers and
thersholdings.
   
  Hope this helps!
   
  Elizabeth Lawson

Amir Safari <amsa36060@yahoo.com> wrote:
  

Dear R Users,
For running wavelet functions using dwt( ), modwt( ), and mra( ), a wavelet
filter algorithm is applied. For all these functions, default is "la8"
and other possibility is "haar". In related documents, another
possibilities like as symlet and coiflet ... are not cited.
Besides "la8" and "haar", which wavelet filters can be used?
Thank you for any help,
Amir Safari



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Amir,

if you try the following code:

require(wavelslim)
data(doppler)
dwt(doppler, wf="la6")

you get:

Error in switch(name, haar = select.haar(), d4 = select.d4(), mb4 = 
select.mb4(),  :   Invalid selection for wave.filter

So, it seems that instead of "la8" (default) and "haar" you
can choose also
"d4" and "mb4" only.

HTH,

Rogerio.
>Message: 5
>Date: Sun, 8 Jan 2006 04:46:47 -0800 (PST)
>From: Amir Safari <amsa36060 at yahoo.com>
>Subject: [R] Filters in waveslim
>To: R-help at stat.math.ethz.ch
>Message-ID: ><20060108124647.94058.qmail at
web60415.mail.yahoo.com>
>Content-Type: text/plain
>
>
>
>  Dear R Users,
> For running  wavelet functions using dwt( ), modwt( ), and mra( ), a 
> wavelet >filter  algorithm is applied. For all these functions, default
is
> "la8" and  other >possibility is "haar". In related
documents, another
> possibilities like as symlet >and coiflet ... are not cited.
> Besides "la8" and "haar", which wavelet filters can be
used?
>Thank you for any help,
>  Amir Safari