Module: Ms::Spectrum::Filter

Included in:
Ms::Spectrum
Defined in:
lib/ms/spectrum/filter.rb

Instance Method Summary collapse

Instance Method Details

#filter(by = :bins, opts = {}) ⇒ Object 



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# File 'lib/ms/spectrum/filter.rb', line 7

def filter(by=:bins, opts={})
  send("filter_by_#{by}".to_sym, opts)
end

#filter_by_bins(opts = {}) ⇒ Object

filters by binning the mz field bin_width is in m/z units num_peaks is the top peaks to include per bin



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# File 'lib/ms/spectrum/filter.rb', line 14

def filter_by_bins(opts={})
  (bw, np) = {:bin_width => 100, :num_peaks => 7 }.merge(opts).values_at(:bin_width, :num_peaks)

  stop = bw
  track = []
  track_all = [track]
  ints = self.intensities
  self.each do |mz,int|
    if mz > stop
      stop += bw
      track = []
      track_all << track
    end
    track << [int, mz]
  end

  include = []
  track_all.each do |track|
    track.sort!
    start = (track.size < np) ? track.size : np
    include.push( *( track[-start,np]) )
  end

  ret_ints = []
  ret_mzs = include.map {|int, mz| [mz, int] }.sort.map {|mz,int| ret_ints << int ; mz }

  return Spectrum.new([ret_mzs, ret_ints])
end