Afr2T {photobiology}

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

Afr2T(x, action, byref, clean, ...)

## Default S3 method:
Afr2T(x, action = NULL, byref = FALSE, clean = FALSE, ...)

## S3 method for class 'numeric'
Afr2T(x, action = NULL, byref = FALSE, clean = FALSE, Rfr = NA_real_, ...)

## S3 method for class 'filter_spct'
Afr2T(x, action = "add", byref = FALSE, clean = FALSE, ...)

## S3 method for class 'object_spct'
Afr2T(x, action = "add", byref = FALSE, clean = FALSE, ...)

## S3 method for class 'filter_mspct'
Afr2T(
  x,
  action = "add",
  byref = FALSE,
  clean = FALSE,
  ...,
  .parallel = FALSE,
  .paropts = NULL
)

## S3 method for class 'object_mspct'
Afr2T(
  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 Tfr 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.

Methods (by class)

• Afr2T(default): Default method for generic function

• Afr2T(numeric): Default method for generic function

• Afr2T(filter_spct): Method for filter spectra

• Afr2T(object_spct): Method for object spectra

• Afr2T(filter_mspct): Method for collections of filter spectra

• Afr2T(object_mspct): Method for collections of object spectra

See Also

Other quantity conversion functions: A2T(), T2A(), T2Afr(), any2T(), as_quantum(), e2q(), e2qmol_multipliers(), e2quantum_multipliers(), q2e()

Examples

T2Afr(Ler_leaf.spct)