LA(8) from R wavelets package equivalent in pywt

[ajety...@gmail.com]

Hi, does the pywt package offer a LA8 wavelet, the closest i can get seems to be the D4 but they still differ, and also the naming convention in pywt, is done by counting the number of vanishing moments not the actual lenght right?

[Gregory Lee]

Does LA stand for "least asymmetric"? Can you try comparing to 'sym4' in PyWavelets. 'sym4' is a length 8 symmlet (perhaps also known as LA?).

On Mon, Apr 8, 2019 at 5:41 PM <ajety...@gmail.com> wrote:

Hi, does the pywt package offer a LA8 wavelet, the closest i can get seems to be the D4 but they still differ, and also the naming convention in pywt, is done by counting the number of vanishing moments not the actual lenght right?

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[Gregory Lee]

To follow up on my answer, 'sym4' is indeed the same as LA(8)

see pywt.Wavelet('sym4').dec_lo vs. the coefficients in:

https://rdrr.io/rforge/waveslim/src/R/wave.filter.R

The coeffs look the same up to 12 digits or so. I don't know which library is more accurate after that.

[Ajet Luka]

Hi Gregory it does seem to be the same one thanks for your help :)

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