Retrieves or sets the wavelengths of a 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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