MS {IDPmisc} | R Documentation |
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.
data(MS)
A data frame with 45213 observations on the following 2 variables.
mz
I
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.
Medical research project.
data(MS) MS <- log10(MS[MS$mz>12000&MS$mz<1e5,]) P <- peaks(MS, minPH=0.025, minPW=0.0015) plot(MS, ty="l", xlim=c(4.15,5)) abline(v=P$x,col="blue", lwd=1)