correctPeaks {alsace} | R Documentation

## Correct peak positions according to a ptw warping model

### Description

Once an appropriate warping model has been established, corrected retention times can be predicted for each peak. These are stored in a separate column in the list of peak tables.

### Usage

    correctPeaks(peakList, modList)

### 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.
`modList` | A list of ptw models.

### Value

The input list of peak tables is returned with extra columns containing the corrected retention time.

### Author(s)

Ron Wehrens

### See Also

`correctRT`

### Examples

    data(teaMerged)
    pks <- getAllPeaks(teaMerged$CList, span = 11)
    warping.models <- correctRT(teaMerged$CList, reference = 2,
                                what = "models")
    pks.corrected <- correctPeaks(pks, warping.models)

    ## original profiles and peaks, in black and gray
    plot(teaMerged, mat.idx = 3, what = "profiles", comp.idx = 2,
         showWindows = FALSE, col = "gray")
    abline(v = pks[[3]][[2]][,"rt"])
    ## shifted profiles and peaks, in red and pink
    CList.corrected <- correctRT(teaMerged$CList, reference = 2)
    lines(as.numeric(rownames(CList.corrected[[3]])),
          CList.corrected[[3]][,2], col = "pink")
    abline(v = pks.corrected[[3]][[2]][,"rt.cor"], col = "red")
    ## note that the rightmost peak in the uncorrected data is no longer
    ## within the range of the data

[Package alsace version 1.23.1 Index]