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Re: Using Haar wavelet with wv_cwt [message #94789 is a reply to message #94000]

Fri, 13 October 2017 10:12

benjamin.castellani is currently offline

benjamin.castellani
Messages: 7
Registered: October 2017

Junior Member

On Sunday, December 18, 2016 at 12:32:21 PM UTC-7, owentr...@gmail.com wrote:
> Hi all,
> I've been trying to use wv_cwt to perform the wavelet transform on a 1d time series. It works fine with the morlet and paul wavelets but I cannot use it with the Haar wavelet. All I get in the console is "Keyword parameters not allowed in call."
>
> Any thoughts?
>
> Many thanks,
> Owen

I apologize that our wavelet documentation is a little "light" and confusing. The issue is that the Haar wavelet family is of type discrete. WV_CWT is for continuous wavelets only. You will want to use WV_DWT (for discrete).

You need to run WV_FN_HAAR separately first to create your coefficients based on the order you define.
Then you input all that information into WV_DWT to develop create wavelet transform.

============
Example:

coefficents_parameters = wv_fn_haar(1,scaling,wavelet,ioff,joff)
data = randomu(1,64)
part_wv = wv_dwt(data, wavelet,scaling,ioff,joff, N_LEVELS=3)

Does this make sense? For continuous families, you can use WV_CWT directly. For discrete families, you must wave the WV_FN_FAMILYNAME function first, then WV_DWT.

============

Hope this helps.

P.S. I will look into making this more clear in the IDL Documentation Center.

Ben Castellani
IDL Team
Harris Geospatial Solutions

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[Message index]

		Using Haar wavelet with wv_cwt By: owentrefonwys on Sun, 18 December 2016 11:32
		Re: Using Haar wavelet with wv_cwt By: benjamin.castellani on Fri, 13 October 2017 10:12
		Re: Using Haar wavelet with wv_cwt By: o.wyn.roberts on Wed, 13 December 2017 05:14

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