MS: Spectrum Measured by a SELDI TOF Mass Spectrometer

In IDPmisc: 'Utilities of Institute of Data Analyses and Process Design (www.zhaw.ch/idp)'

Description

The spectrum was taken from a sample of sheep blood. The instrument used was a so called SELDI TOF (Surface Enhanced Laser Desorption Ionisation, Time Of Flight) Mass Spectrometer.

Usage

data(MS)

Format

A data frame with 45213 observations on the following 2 variables.

mz

mass / charge

I

Intensity

Details

The measured masses lie between m/z=1000 and 200000. The intensities are raw output. Neither smoothing nor background subtraction was applied to the spectrum.

Source

Medical research project.

Examples

data(MS)

MS1 <- log10(MS[MS$mz>12000&MS$mz<1e5,])
P <- peaks(MS1, minPH=0.025, minPW=0.0015)

plot(MS1, ty="l", xlim=c(4.15,5))
points(P,col="red")

IDPmisc documentation built on Jan. 21, 2020, 5:06 p.m.