wl | R Documentation |
Spectra*
object.Either retrieves the wavelengths from a Spectra*
object, or creates a
Spectra*
object from a "data.frame"
object by setting some of
its columns as the wavelengths.
When applied to a Spectra*
object, this functions simply returns the
wavelengths of the spectra it is storing.
If applied on a "data.frame"
object, it is an helper function to
create a Spectra*
object. It then needs to be indicated the
wavelengths at which the spectra values are measured. The assumption is that
each row of the "data.frame"
is a spectra, and the column names of
the "data.frame"
contain the wavelengths values.
If all the columns are used to create the Spectra*
object, a
Spectra
object is created. If some attributes are left, they will be
used to generate a SpectraDataFrame
object.
## S4 method for signature 'Spectra'
wl(object)
## S4 replacement method for signature 'data.frame'
wl(object) <- value
## S4 replacement method for signature 'Spectra'
wl(object) <- value
object |
a |
value |
the wavelengths of the |
If applied on a "data.frame"
, either a Spectra
or a
SpectraDataFrame
object. If applied on a Spectra*
object, a
vector.
Pierre Roudier pierre.roudier@gmail.com
spectra
, Spectra-class
,
SpectraDataFrame-class
# Loading example data
data(oz)
spectra(oz) <- sr_no ~ ... ~ 350:2500
# Retrieving wavelengths from Spectra* object
wl(oz)
# Replacing wavelength values - USE WITH CAUTION!
wl(oz) <- 1:length(oz)
wl(oz)
# Use to initiate a Spectra* object from a data.frame
data(oz)
wl(oz) <- 350:2500
ids(oz) <- ~ sr_no
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