Class: Noyes::PowerSpectrumFilter

Inherits:
Object
  • Object
show all
Includes:
NoyesFilterDSL
Defined in:
lib/ruby_impl/power_spec.rb,
lib/common/noyes_dsl.rb

Overview

The square of the DFT. You must specify the number of ffts. The power spectrum returns an array of arrays where each inner array is of length nfft/2 + 1. The length of the outer array does not change.

Instance Method Summary collapse

Methods included from NoyesFilterDSL

#+, #|

Constructor Details

#initialize(nfft) ⇒ PowerSpectrumFilter

Returns a new instance of PowerSpectrumFilter.



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# File 'lib/ruby_impl/power_spec.rb', line 7

def initialize nfft
  @nfft = nfft
end

Instance Method Details

#<<(data) ⇒ Object 



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# File 'lib/ruby_impl/power_spec.rb', line 10

def << data
  nuniqdftpts = @nfft/2 + 1
  data.map do |datavec|
    datavecfft = Noyes.dft datavec, @nfft
    Array.new(nuniqdftpts){|i| datavecfft[i].abs**2}
  end
end