% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/preprocess-spc.R
\name{preprocess_spc}
\alias{preprocess_spc}
\title{Preprocess spectra}
\usage{
preprocess_spc(spc_tbl, select, column_in = "spc_mean", custom_function = NULL)
}
\arguments{
\item{spc_tbl}{Tibble that contains spectra to be preprocessed within
a list-column.}

\item{select}{Character vector of predefined preprocessing options to be
applied to the spectra list-column specified in \code{column_in}.
Common prefined values are stated as abbreviated preprocessing methods and
options such as \code{"sg_1_w21"}, where \code{"sg"} stands for
Savitzky-Golay and \code{1} for first derivative and \code{"w21"}
for a window size of 21 points.}

\item{column_in}{Character vector of single list-column in \code{spc_tbl} that
contain list of spectra (1 row matrix) to be processed by function supplied
in \code{select}.}

\item{custom_function}{A character string of a custom processing function
that is later parsed (produces expression in a list) and evaluated within
the function \code{preprocess_spc}.
The character vector argument of \code{custom_function}
needs to contain \code{"spc_raw"}, which is the single data table of spectra
that results from binding a list of data.tables (spectra to preprocess)
from the spectra list-column specified in \code{column_in}.
An example for a value is
\code{"prospectr::savitzkyGolay(X = spc_raw, m = 0, p = 3, w = 9)"}.
Optional argument. Default is \code{NULL}.}
}
\description{
Preprocesses spectra in tibble column by sample_id after
averaging spectra by \code{simplerspec::average_spc()}.
}