Method to compute the "parallel" variance of values across members of a collections of spectra or of a spectral object containing multiple spectra in long form.
s_var(x, na.rm, ...)# S3 method for default
s_var(x, na.rm = FALSE, ...)
# S3 method for generic_spct
s_var(x, na.rm = FALSE, ...)
# S3 method for filter_mspct
s_var(x, na.rm = FALSE, ...)
# S3 method for source_mspct
s_var(x, na.rm = FALSE, ...)
# S3 method for response_mspct
s_var(x, na.rm = FALSE, ...)
# S3 method for reflector_mspct
s_var(x, na.rm = FALSE, ...)
# S3 method for calibration_mspct
s_var(x, na.rm = FALSE, ...)
# S3 method for cps_mspct
s_var(x, na.rm = FALSE, ...)
# S3 method for raw_mspct
s_var(x, na.rm = FALSE, ...)
If 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
summary spectrum, with variables with names tagged for summaries other
than mean or median.
An R object. Currently this package defines methods for collections of spectral objects.
logical. A value indicating whether NA values should be stripped before the computation proceeds.
Further arguments passed to or from other methods.
s_var(default):
s_var(generic_spct):
s_var(filter_mspct):
s_var(source_mspct):
s_var(response_mspct):
s_var(reflector_mspct):
s_var(calibration_mspct):
s_var(cps_mspct):
s_var(raw_mspct):
Method specializations compute the variance at each wavelength
across a group of spectra stored in an object of one of the classes defined
in package 'photobiology'. Omission of NAs is done separately at each
wavelength. Interpolation is not applied, so all spectra in x must
share the same set of wavelengths. An error is triggered if this condition
is nor fulfilled.