Retrieves or sets the data slot of a SpectraDataFrame object.
Either retrieves the attributes values from the data slot of a
SpectraDataFrame object, or upgrades a Spectra object to a SpectraDataFrame
object by initialising its data slot by a suitable "data.frame"
object.
## S4 method for signature 'SpectraDataFrame' features(object,exclude_id) ## S4 replacement method for signature 'Spectra' features(object,safe,exclude_id,key,append) <- value
object |
a |
exclude_id |
see below |
value |
see below |
safe |
see below |
key |
see below |
append |
see below |
The features methods return a data.frame object, while
the "features<-" methods return a SpectraDataFrame object.
x=Spectra
features(object, safe=TRUE, key=NULL, exclude_id=TRUE) <- value
object |
A Spectra object |
|
safe |
Logical. If TRUE, data is being added to the object using a
SQL join (using a key field given by the key option), otherwise it is
assumed the order of the rows is consitent with the order of the rows in
object |
|
key |
Character, name of the column of the
data.frame storing the ids for the SQL join. Ignored if safe is
FALSE. |
|
exclude_id |
Logical, if TRUE, ids
used for the SQL join are removed from the data slot after the join. |
|
x=SpectraDataFrame
features(obj, exclude_id=TRUE)
features(obj, safe=TRUE, key=NULL, exclude_id=TRUE, append=TRUE) <-
value
object |
A SpectraDataFrame object |
|
safe |
Logical. If TRUE, data is being added to the object
using a SQL join (using a key field given by the key option),
otherwise it is assumed the order of the rows is consitent with the order of
the rows in object |
|
key |
Character, name of the
column of the data.frame storing the ids for the SQL join. Ignored if
safe is FALSE. |
|
exclude_id |
Logical. For
the features method, if TRUE, the spectra ids are added to the
data.frame that is returned. For the "features<-" method, If
TRUE, ids used for the SQL join are removed from the data slot after
the join. |
|
append |
Logical, if TRUE, the data is
appended to any existing data. if FALSE, the data provided is erasing any
existing data. |
|
Pierre Roudier pierre.roudier@gmail.com
# Loading example data data(oz) spectra(oz) <- sr_no ~ ... ~ 350:2500 # Printing available data features(oz) # Promoting a Spectra to a SpectraDataFrame object s <- as(oz, "Spectra") # Generating dummy data d <- data.frame( id = ids(oz), foo = runif(nrow(oz)), bar = sample(LETTERS[1:5], size = nrow(oz), replace = TRUE) ) head(d) # Affecting data to Spectra object features(s, key = 'id') <- d # Adding data to an existing SpectraDataFrame object features(oz, key = 'id') <- d features(oz) # Replacing data of an existing SpectraDataFrame object features(oz, key = 'id', append = FALSE) <- d features(oz)
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