## load package
library("MALDIquant")
## create four MassPeaks objects and add them to the list
p<- list(createMassPeaks(mass=1:2, intensity=1:2),
createMassPeaks(mass=1:3, intensity=1:3),
createMassPeaks(mass=1:4, intensity=1:4),
createMassPeaks(mass=1:5, intensity=1:5))
## only use peaks which occur in all MassPeaks objects as reference peaks
refPeaks <- referencePeaks(p, minFrequency=1)
mass(refPeaks) # 1:2
intensity(refPeaks) # c(1, 1)
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