photobiology: s_sd – R documentation

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s_sd

Standard Deviation of a collection of spectra

Description

A method to compute the standard deviation of values across members of a collections of spectra. Computes the standard deviation at each wavelength across all the spectra in the collection returning a spectral object.

Usage

s_sd(x, na.rm, ...)

## Default S3 method:
s_sd(x, na.rm = FALSE, ...)

## S3 method for class 'filter_mspct'
s_sd(x, na.rm = FALSE, ...)

## S3 method for class 'source_mspct'
s_sd(x, na.rm = FALSE, ...)

## S3 method for class 'response_mspct'
s_sd(x, na.rm = FALSE, ...)

## S3 method for class 'reflector_mspct'
s_sd(x, na.rm = FALSE, ...)

## S3 method for class 'calibration_mspct'
s_sd(x, na.rm = FALSE, ...)

## S3 method for class 'cps_mspct'
s_sd(x, na.rm = FALSE, ...)

## S3 method for class 'raw_mspct'
s_sd(x, na.rm = FALSE, ...)

Arguments

`x`	An R object. Currently this package defines methods for collections of spectral objects.
`na.rm`	logical. A value indicating whether NA values should be stripped before the computation proceeds.
`...`	Further arguments passed to or from other methods.

Value

If x is a collection spectral of objects, such as a "filter_mspct" object, the returned object is of class "generic_spct", containing the standard deviation among the spectra at each wavelength in a column with name ending in ".sd".

Methods (by class)

default:
filter_mspct:
source_mspct:
response_mspct:
reflector_mspct:
calibration_mspct:
cps_mspct:
raw_mspct:

Note

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.

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.