fshift | R Documentation |
The fshift()
methods return a spectral object of the same class as the
one supplied as argument but with the spectral data on a zero-shifted scale.
A range of wavelengths is taken as a zero reference and the summary
calculated with f
for this waveband is substracted. This results in a
zero shift (= additive correction) to the values in the returned object.
Metadata attributes are retained unchanged.
fshift(x, ...)
## Default S3 method:
fshift(x, ...)
## S3 method for class 'source_spct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "mean",
unit.out = getOption("photobiology.radiation.unit", default = "energy"),
...
)
## S3 method for class 'response_spct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "mean",
unit.out = getOption("photobiology.radiation.unit", default = "energy"),
...
)
## S3 method for class 'filter_spct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "min",
qty.out = getOption("photobiology.filter.qty", default = "transmittance"),
...
)
## S3 method for class 'reflector_spct'
fshift(x, range = c(wl_min(x), wl_min(x) + 10), f = "min", qty.out = NULL, ...)
## S3 method for class 'source_mspct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "mean",
unit.out = getOption("photobiology.radiation.unit", default = "energy"),
...
)
## S3 method for class 'raw_spct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "mean",
qty.out = NULL,
...
)
## S3 method for class 'cps_spct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "mean",
qty.out = NULL,
...
)
## S3 method for class 'generic_spct'
fshift(x, range = c(wl_min(x), wl_min(x) + 10), f = "mean", col.names, ...)
## S3 method for class 'response_mspct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "mean",
unit.out = getOption("photobiology.radiation.unit", default = "energy"),
...,
.parallel = FALSE,
.paropts = NULL
)
## S3 method for class 'filter_mspct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "min",
qty.out = getOption("photobiology.filter.qty", default = "transmittance"),
...,
.parallel = FALSE,
.paropts = NULL
)
## S3 method for class 'reflector_mspct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "min",
qty.out = NULL,
...,
.parallel = FALSE,
.paropts = NULL
)
## S3 method for class 'raw_mspct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "min",
...,
.parallel = FALSE,
.paropts = NULL
)
## S3 method for class 'cps_mspct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "min",
...,
.parallel = FALSE,
.paropts = NULL
)
## S3 method for class 'generic_mspct'
fshift(
x,
range = c(wl_min(x), wl_min(x) + 10),
f = "min",
col.names,
...,
.parallel = FALSE,
.paropts = NULL
)
x |
An R object |
... |
additional named arguments passed down to |
range |
An R object on which |
f |
character string "mean", "min" or "max" for scaling so that this
summary value becomes the origin of the spectral data scale in the returned
object, or the name of a function taking |
unit.out |
character Allowed values "energy", and "photon", or its alias "quantum" |
qty.out |
character Allowed values "transmittance", and "absorbance" |
col.names |
character vector containing the names of columns or variables to which to apply the scale shift. |
.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. |
A copy of x
with the spectral data values replaced with values
zero-shifted.
a new object of the same class as x
.
fshift(default)
: Default for generic function
fshift(source_spct)
:
fshift(response_spct)
:
fshift(filter_spct)
:
fshift(reflector_spct)
:
fshift(source_mspct)
:
fshift(raw_spct)
:
fshift(cps_spct)
:
fshift(generic_spct)
:
fshift(response_mspct)
:
fshift(filter_mspct)
:
fshift(reflector_mspct)
:
fshift(raw_mspct)
:
fshift(cps_mspct)
:
fshift(generic_mspct)
:
Method fshift
is not implemented for solute_spct
objects
as the spectral data stored in them are a description of an intensive
property of a substance. To represent solutions of specific concentrations
of solutes, filter_spct
objects can be used.
Other rescaling functions:
fscale()
,
getNormalized()
,
getScaled()
,
is_normalized()
,
is_scaled()
,
normalize()
,
setNormalized()
,
setScaled()
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