Questions on the wavelet analysis functions of Mathematica.
14
votes
2answers
620 views
Detecting spikes by shrinking WaveletPacket basis using a specific threshold
Last time, I asked how I can use the command DiscreteWaveletPacketTransform[data, filter, 0] for spike detection and I got answers mostly based on an automatically ...
4
votes
2answers
504 views
Wavelet Packet Transform in Mathematica 7 and 8
For finding location of spikes in a time series I used to transform the data into wavelet space using
DiscreteWaveletPacketTransform [ data, filter, 0]
and then ...
3
votes
1answer
122 views
Wavelets: Relative error vs compression ratio
I need to plot the relative error vs compression ratio diagram of a discrete wavelet transform on an image, but no luck so far ..
Here's the problem in short:
random_image.jpg
compress the image
...
1
vote
1answer
102 views
Function definition and delayed assignment
I need to define the following function
MyWavelet[n_]["PrimalLowpass", prec_ : MachinePrecision] :=
Table[(-1)^(j - 1) h[[2*n - j]], {j, 0, 2*n - 1}]
which ...
1
vote
0answers
56 views
Is there a relatively easy way to add the “Cone of Influence” to a waveletscalogram?
I am analyzing time series data using the ContinousWaveletTransform function, and plotting the results with WaveletScalogram. I would like to plot the cone of influence on top of the WaveletScalogram ...
