filterPeaks {alsace} | R Documentation

## Filter peak lists

### Description

Utility function to remove peaks from a peak list, e.g. because their intensity is too low. Currently one can filter on peak height, peak area, and width at half maximum.

### Usage

    filterPeaks(peakList, minHeight, minArea, minWHM, maxWHM)

### Arguments

`peakList` | A nested list of peak tables: the first level is the sample, and the second level is the component. Every component is described by a matrix where every row is one peak, and the columns contain information on retention time, full width at half maximum (FWHM), peak width, height, and area.
`minHeight` | Minimum peak height.
`minArea` | Minimum peak area.
`minWHM` | Minimal width at half maximum.
`maxWHM` | Maximum width at half maximum.

### Value

A peak list similar to the input peakList, but with all rows removed from the peak tables that are not satisfying the criteria.

### Author(s)

Ron Wehrens

### See Also

`getAllPeaks`

### Examples

    data(teaMerged)
    pks <- getAllPeaks(teaMerged$CList, span = 11)
    ## only retain peaks with a peak height of at least 2
    pks.filtered <- filterPeaks(pks, minHeight = 2)
    plot(teaMerged, mat.idx = 3, what = "profiles", comp.idx = 2,
         showWindows = FALSE, col = "blue")
    abline(v = pks[[3]][[2]][,"rt"], col = "gray", lty = 2)
    abline(v = pks.filtered[[3]][[2]][,"rt"])

[Package alsace version 1.16.0 Index]