poissonScaling: generic method for "poissonScaling"

In tofsims: Import, process and analysis of Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) imaging data

Description

Possion scaling for data matrices.

Usage

poissonScaling(object, offset = 1, ...)

## S4 method for signature 'MassSpectra'
poissonScaling(object, offset = 1, ...)

Arguments

object	object of class MassSpectra
offset	numeric value for poisson scaling
...	further args

Details

Possion scaling is proposed as the method of choice for ToF-SIMS data see Keenan and Kotula 2004. This implementation was done according to a description in Multivariate Analysis of SIMS spectra in ToF-SIMS: Materials Analysis by Mass Spectrometry, Vickerman and Briggs 2013 and the eigenvector wiki. The offset is described in the eigenvector wiki.

Value

object of class MassSpectra with poission scaled mass spectra in slot nz

object of class MassSpectra

Author(s)

Lorenz Gerber [e-mail]

Examples

## poisson scaling of MassSpectra objects
testImage <- MassImage('dummy')
testImage <- poissonScaling(testImage)
## Not run: 
# poission scaling on real data
library(tofsimsData)
data(tofsimsData)
par(mfcol=c(2,2))
plot(testImage,type='l')
image(testImage)
testImage <- poissonScaling(testImage)
plot(testImage,type='l')
image(testImage)

## End(Not run)

tofsims documentation built on Nov. 8, 2020, 5:10 p.m.