Re: Wavelet "filter"?
- To: mathgroup at smc.vnet.net
- Subject: [mg84899] Re: Wavelet "filter"?
- From: Bill Rowe <readnewsciv at sbcglobal.net>
- Date: Fri, 18 Jan 2008 05:50:54 -0500 (EST)
On 1/16/08 at 3:21 AM, edsferr at uol.com.br (edsferr) wrote:
>I'm pretty new to wavelets so I'm not sure how to ask this.
>I have a database with 4096 points like this:
>1 0
>2 1
>3 1
>4 0
>...
>4096 1
>I have plot the wavelet power spectrum of this data using a Java
>routine in a website . What I need is to analise this plot and
>develop a special "filter" for 14 character strings based on the
>power time- frequency results.
It is very unclear to me what it is you want to do here. Are the
"14 character strings" to be found in your original data set? Or
are they found in the plot you seem to have made using Java?
If the "14 character strings" are in the original data set, what
defines the strings you want other than length?
If the goal is to simply find strings 14 characters long with
some pre-specified pattern, there are more efficient techniques
than using wavelet based filters. For example:
generate some data
data = RandomInteger[{0, 1}, 4096];
then the following finds all sequences of length 14 starting
with 8 1's
Cases[Partition[data, 14, 1], {1, 1, 1, 1, 1, 1, 1, 1, __}]
>I need to see if a 14 characters string (14 points) "fits" on the
>plot! How do I do that?
First, you could more clearly state what you want to achieve.
>Am I missing something important that I need before doing this? I need
>to know if it's possible to do this task using wavelets. Could the
>"Wavelet Explorer" package do that?
I have that package and I have found it quite useful.
Additionally, the manual that came with it was clear and
informative. But since it is not at all clear to me what you are
trying to do, I can't really determine if this package would be
useful for you or not.
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