specPeaks: Identify peaks in a sparse continuum mode spectrum
Description
Given a spectrum, identify and list significant peaks as determined
by several criteria.
Usage
specPeaks(spec, sn = 20, mzgap = 0.2)
Arguments
spec
matrix with named columns mz and intensity
sn
minimum signal to noise ratio
mzgap
minimal distance between adjacent peaks, with smaller peaks
being excluded
Value
A matrix with columns:
mz
m/z at maximum peak intensity
intensity
maximum intensity of the peak
fwhm
full width at half max of the peak
Details
Peaks must meet two criteria to be considered peaks: 1) Their
s/n ratio must exceed a certain threshold. 2) They must not be
within a given distance of any greater intensity peaks.