ir_normalize.Rd

% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/ir_normalize.R
\name{ir_normalize}
\alias{ir_normalize}
\alias{ir_normalise}
\title{Normalizes infrared spectra in an \code{ir} object}
\usage{
ir_normalize(x, method = "area")

ir_normalise(x, method = "area")
}
\arguments{
\item{x}{An object of class \code{\link[=ir_new_ir]{ir}}.}

\item{method}{A character value specifying which normalization method to
apply. If \code{method = "zeroone"}, all intensity values will be normalized
to [0;1]. If \code{method = "area"}, all intensity values will be divided by
the sum of the intensity values at all wavenumber values of the spectrum. If
\code{method} is convertible to a numeric value, e.g. \code{method = "980"},
the intensity of all spectra at a wavenumber value of 980 will be set to 1
and the minimum intensity value of each spectrum will be set to 0, i.e. the
spectra will be normalized referring to a specific wavenumber value.}
}
\value{
An object of class \code{ir} representing a normalized version of
\code{x}.
}
\description{
\code{ir_normalize} normalizes the intensity values of infrared spectra.
Spectra can be normalized in three ways (value for argument \code{method}):
\describe{
\item{"zeroone"}{Normalization so that the intensity values range in [0;1].
Note that for different spectra, for different wavenumber values the
intensity may be 1 after normalization, depending on the location of the
peak with the maximum height.}
\item{"area"}{Normalization so that the intensity values of each spectrum
sum to 1. Note that in the case of negative intensities values, these will
be count as negative values during summation.}
\item{A numeric value}{Normalization so that the intensity at a specified
wavenumber value has value 1 and the minimum intensity value is 0.}
}
}
\examples{
# with method = "area"
x <-
   ir::ir_sample_data \%>\%
   ir::ir_normalize(method = "area")

# normalizing to a specific peak
x <-
   ir::ir_sample_data \%>\%
   ir::ir_normalize(method = 1090)

}