Estimate precursor intensity for MS level 2 spectra
Source:R/functions-OnDiskMSnExp.R
estimatePrecursorIntensity.Rd
estimatePrecursorIntensity
determines the precursor intensity for a MS 2
spectrum based on the intensity of the respective signal from the
neighboring MS 1 spectra (i.e. based on the peak with the m/z matching the
precursor m/z of the MS 2 spectrum). Based on parameter method
either the
intensity of the peak from the previous MS 1 scan is used
(method = "previous"
) or an interpolation between the intensity from the
previous and subsequent MS1 scan is used (method = "interpolation"
, which
considers also the retention times of the two MS1 scans and the retention
time of the MS2 spectrum).
Arguments
- x
OnDiskMSnExp
orXCMSnExp
object.- ppm
numeric(1)
defining the maximal acceptable difference (in ppm) of the precursor m/z and the m/z of the corresponding peak in the MS 1 scan.- method
character(1)
defining the method how the precursor intensity should be determined (see description above for details). Defaults tomethod = "previous"
.- BPPARAM
parallel processing setup. See
bpparam()
for details.