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#' Product from collection of spectra
#'
#' A method to compute the product of values across members of a collections of
#' spectra. Computes the product at each wavelength across all the spectra in the
#' collection returning a spectral object.
#'
#' @param x An R object. Currently this package defines methods for collections of
#' spectral objects.
#' @param na.rm logical. A value indicating whether NA values should be stripped
#' before the computation proceeds.
#' @param ... Further arguments passed to or from other methods.
#'
#' @return If \code{x} is a collection spectral of objects, such as a
#' "filter_mspct" object, the returned object is of same class as the
#' members of the collection, such as "filter_spct", containing the product
#' of the spectra.
#'
#' @note Omission of NAs is done separately at each wavelength. Interpolation is
#' not applied, so all spectra in \code{x} must share the same set of
#' wavelengths.
#'
#' A product of spectral irradiance or spectral response is no longer a well
#' defined physical quanttiy, and these product operations return an object of
#' class generic_spct.
#'
#' Objects of classes raw_spct and cps_spct can contain data from multiple
#' scans. This functions are implemented for these classes only for the case
#' when all member spectra contain data for a single scan, or spliced into a
#' single column in the case of cps_spct members.
#'
#' @seealso See \code{\link[base]{prod}} for the \code{prod()} method used for
#' the computations.
#'
#' @export
#'
s_prod <- function(x, na.rm, ...)
UseMethod("s_prod")
#' @describeIn s_prod
#'
#' @export
#'
s_prod.default <- function(x, na.rm = FALSE, ...) {
warning("Metod 's_prod()' not implementd for objects of class ",
class(x)[1],
".")
ifelse(is.any_mspct(x), do.call(class(x[[1]])[1], args = list()), NA)
}
#' @describeIn s_prod
#'
#' @export
#'
s_prod.source_mspct <- function(x, na.rm = FALSE, ...) {
warning("A product of irradiance values does not yield response irradiance!!")
rowwise_source(
x,
.fun = base::prod,
na.rm = na.rm,
col.name.tag = ".prod",
.fun.name = "Product of"
)
}
#' @describeIn s_prod
#'
#' @export
#'
s_prod.response_mspct <- function(x, na.rm = FALSE, ...) {
warning("A product of response values does not yield response values!!")
rowwise_response(
x,
.fun = base::prod,
na.rm = na.rm,
col.name.tag = ".prod",
.fun.name = "Product of"
)
}
#' @describeIn s_prod
#'
#' @export
#'
s_prod.filter_mspct <- function(x, na.rm = FALSE, ...) {
rowwise_filter(x,
.fun = base::prod,
na.rm = na.rm,
.fun.name = "Product of")
}
#' @describeIn s_prod
#'
#' @export
#'
s_prod.reflector_mspct <- function(x, na.rm = FALSE, ...) {
rowwise_reflector(x,
.fun = base::prod,
na.rm = na.rm,
.fun.name = "Product of")
}
#' @describeIn s_prod
#'
#' @export
#'
s_prod.calibration_mspct <- function(x, na.rm = FALSE, ...) {
rowwise_calibration(
x,
.fun = base::prod,
na.rm = na.rm,
col.name.tag = ".prod",
.fun.name = "Product of"
)
}
#' @describeIn s_prod
#'
#' @export
#'
s_prod.cps_mspct <- function(x, na.rm = FALSE, ...) {
rowwise_cps(
x,
.fun = base::prod,
na.rm = na.rm,
col.name.tag = ".prod",
.fun.name = "Product of"
)
}
#' @describeIn s_prod
#'
#' @export
#'
s_prod.raw_mspct <- function(x, na.rm = FALSE, ...) {
rowwise_raw(
x,
.fun = base::prod,
na.rm = na.rm,
col.name.tag = ".prod",
.fun.name = "Product of"
)
}
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