This function carries out normalization of the spectra in a <code>Spectra</code> object.  There are currently two options, though others are readily added.   <code>"TotInt"</code> normalizes by total intensity.  In this case, the y-data of a <code>"Spectra"</code> object is normalized by dividing each y-value by the sum of the y-values in a given spectrum.  This each spectrum sums to 1.  This method assumes that the total concentration of substances giving peaks does not vary across samples which may not be true. <code>"Range"</code> allows one to do something similar but rather than using the sum of the entire spectrum as the denominator, only the sum of the given range is used.

manip

utilities

normSpectra

A collection of functions for plotting spectra (NMR, IR etc) and carrying out various forms of top-down exploratory data analysis, such as HCA, PCA and model-based clustering.  The design allows comparison of data from samples which fall into groups such as treatment vs. control.  Robust methods appropriate for this type of high-dimensional data are available.  ChemoSpec is designed to be very user friendly and suitable for people with limited background in R.

normSpectra: Normalize a Spectra Object

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