Extracting and replacing parts of Spectra* objects
These methods emulates classic base methods '[', '[[' and '$' to extract or replace parts of Spectra* objects.
\S4method{[}{Spectra}(x,i,j,...,drop=FALSE)
\S4method{[[}{Spectra}(x,i,j,...)
\S4method{$}{SpectraDataFrame}(x,name)
\S4method{$}{Spectra}(x,name) <- value
\S4method{[[}{Spectra}(x,i,j,...) <- valuex |
an object of class |
i, j, ... |
indices specifying elements to extract or replace |
drop |
currently ignored |
name |
A literal character string or a name (possibly backtick quoted) |
value |
typically an array-like R object of a similar class as x |
These methods either return an object of the same class as x,
or can promote a Spectra object to a SpectraDataFrame object
by adding data ("[[<-" and "$<-" methods).
x=Spectra
x[i, j, ..., drop = FALSE]
x$name <- value
x[[name]] <- value
x |
A Spectra object |
|
i
|
Row index of the selected individuals | |
j |
Selected wavelengths | |
name |
A literal character string or a name | |
... |
Ignored | |
drop |
Ignored | |
x=SpectraDataFrame
x[i, j, k, ..., drop = FALSE]
x[[name]]
x[[name]] <- value
x$name
x$name <- value
x |
A SpectraDataFrame object |
|
i |
Row index of the selected individuals | |
j |
Selected wavelengths | |
k |
Selected columns in the @data slot | |
name |
A literal character string or a name | |
... |
Ignored | |
drop |
Ignored | |
Pierre Roudier pierre.roudier@gmail.com
# Loading example data data(australia) spectra(australia) <- sr_no ~ ... ~ 350:2500 # Getting features information from SpectraDataFrame australia$carbon australia[['carbon']] # Creating new features australia$foo <- runif(nrow(australia)) australia[['bar']] <- runif(nrow(australia)) # Replacing values australia$foo <- sample( LETTERS[1:5], size = nrow(australia), replace = TRUE ) australia[['bar']] <- sample( c(TRUE, FALSE), size = nrow(australia), replace = TRUE ) # Promote Spectra to SpectraDataFrame s <- as(australia, 'Spectra') class(s) s$foo <- runif(nrow(s))
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