T2Afr: Convert transmittance into absorptance.
In photobiology: Photobiological Calculations

T2Afr

R Documentation

Convert transmittance into absorptance.

Description

Function that converts transmittance (fraction) into absorptance (fraction). If reflectance (fraction) is available, it allows conversions between internal and total absorptance.

Usage

T2Afr(x, action, byref, clean, ...)

## Default S3 method:
T2Afr(x, action = NULL, byref = FALSE, clean = FALSE, ...)

## S3 method for class 'numeric'
T2Afr(x, action = NULL, byref = FALSE, clean = FALSE, Rfr = NA_real_, ...)

## S3 method for class 'filter_spct'
T2Afr(x, action = "add", byref = FALSE, clean = FALSE, ...)

## S3 method for class 'object_spct'
T2Afr(x, action = "add", byref = FALSE, clean = FALSE, ...)

## S3 method for class 'filter_mspct'
T2Afr(
  x,
  action = "add",
  byref = FALSE,
  clean = FALSE,
  ...,
  .parallel = FALSE,
  .paropts = NULL
)

## S3 method for class 'object_mspct'
T2Afr(
  x,
  action = "add",
  byref = FALSE,
  clean = FALSE,
  ...,
  .parallel = FALSE,
  .paropts = NULL
)

Arguments

`x`	an R object
`action`	character Allowed values "replace" and "add"
`byref`	logical indicating if new object will be created by reference or by copy of x
`clean`	logical replace off-boundary values before conversion
`...`	not used in current version
`Rfr`	numeric vector. Spectral reflectance o reflectance factor. Set to zero if `x` is internal reflectance,
`.parallel`	if TRUE, apply function in parallel, using parallel backend provided by foreach
`.paropts`	a list of additional options passed into the foreach function when parallel computation is enabled. This is important if (for example) your code relies on external data or packages: use the .export and .packages arguments to supply them so that all cluster nodes have the correct environment set up for computing.

Value

A copy of x with a column Afr added and other columns possibly deleted except for w.length. If action = "replace", in all cases, the additional columns are removed, even if no column needs to be added.