specPeaks: Identify peaks in a sparse continuum mode spectrum

Description Usage Arguments Details Value Author(s) See Also

View source: R/functions-xcmsRaw.R

Description

Given a spectrum, identify and list significant peaks as determined by several criteria.

Usage

1
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

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.

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

Author(s)

Colin A. Smith, [email protected]

See Also

getSpec, specNoise


xcms documentation built on May 18, 2019, 2 a.m.