getPeaks-methods {xcms} | R Documentation

## Get peak intensities for specified regions

### Description

Integrate extracted ion chromatograms in pre-defined defined regions. Return output similar to `findPeaks`.

### Arguments

`object` | the `xcmsSet` object
`peakrange` | matrix or data frame with 4 columns: `mzmin`, `mzmax`, `rtmin`, `rtmax` (they must be in that order or named)
`step` | step size to use for profile generation

### Value

A matrix with columns:

`i` | rank of peak identified in merged EIC (<= `max`), always `NA`
`mz` | weighted (by intensity) mean of peak m/z across scans
`mzmin` | m/z of minimum step
`mzmax` | m/z of maximum step
`ret` | retention time of peak midpoint
`retmin` | leading edge of peak retention time
`retmax` | trailing edge of peak retention time
`into` | integrated area of original (raw) peak
`intf` | integrated area of filtered peak, always `NA`
`maxo` | maximum intensity of original (raw) peak
`maxf` | maximum intensity of filtered peak, always `NA`

### Methods

object = "xcmsRaw"

  `getPeaks(object, peakrange, step = 0.1)`

### See Also

`xcmsRaw-class`

[Package xcms version 3.10.2 Index]