R: Spectrum Measured by a SELDI TOF Mass Spectrometer

MS {IDPmisc} | R Documentation

## Spectrum Measured by a SELDI TOF Mass Spectrometer

### 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")

[Package IDPmisc version 1.1.20 Index]