sampleDist {ChemoSpecUtils}  R Documentation 
Compute the distances between samples in a Spectra
or
Spectra2D
object. This is a means
to quantify the similarity between samples. A heat map style plot is an
option.
sampleDist(spectra, method = "pearson", plot = TRUE, ...)
spectra 

method 
Character. A string giving the distance method. See

plot 
Logical. Shall a level plot (heat map) be made? 
... 
Arguments to be passed to the plotting function. 
A numeric matrix giving the distances between the samples.
Bryan A. Hanson, DePauw University.
For Spectra
objects, see plotSpectraDist
which compares all spectra to a single reference spectrum.
if (checkForPackageWithVersion("ChemoSpec", "5.1")) { library("ChemoSpec") library("lattice") data(SrE.IR) SrE.dmatrix < sampleDist(SrE.IR, # cosine distance bounded on [0...2] method = "cosine", main = "SrE.IR Cosine Distance Between Samples" ) SrE.dmatrix < sampleDist(SrE.IR, # abspearson distance bounded on [0...1] method = "abspearson", main = "SrE.IR Absolute Pearson Distance Between Samples" ) SrE.dmatrix < sampleDist(SrE.IR, # euclidean distance unbounded method = "euclidean", main = "SrE.IR Euclidean Distance Between Samples" ) } if (checkForPackageWithVersion("ChemoSpec2D", "0.3")) { library("ChemoSpec2D") library("lattice") data(MUD1) MUD1.dmatrix < sampleDist(MUD1, method = "cosine", main = "MUD1 Cosine Distance Between Samples" ) }