MALDIquant (version 1.0)

warpMassSpectra: Run warping functions on AbstractMassObject objects.

Description

These functions run warping functions on AbstractMassObject objects (warping is also known as phase correction).

Usage

warpMassPeaks(l, w)
warpMassSpectra(l, w)

Arguments

l

single MassPeaks/MassSpectrum object or a list of these objects.

w

single warping function or a list of warping functions determined by determineWarpingFunctions. Has to be of the same length as l.

Value

• Returns a single or a list warped MassPeaks or MassSpectrum objects (depending on l).

Details

The warping function w is called in the following way: $$newMass = oldMass + w(oldMass)$$

References

See website: http://strimmerlab.org/software/maldiquant/

See Also

determineWarpingFunctions, MassPeaks, MassSpectrum

Examples

## load library
library("MALDIquant");

## create a MassPeaks object
p <- createMassPeaks(mass=1:5, intensity=1:5);

## simple warping function (see determineWarpingFunctions for details)
simpleWarp <- function(x) { return(1); }

## run warping function
w <- warpMassPeaks(p, simpleWarp);

## compare results
all(mass(w) == mass(p)+1); # TRUE