Retrieve or set the extradata of a colorSpec object.
# S3 method for colorSpec
extradata(x)# S3 method for colorSpec
extradata(x,add=FALSE) <- value
extradata(x) returns a data.frame with M rows,
where M is the number of spectra in x.
The rownames are set to the specnames of x.
If there is no extra data then the number of columns in this data.frame is 0.
a colorSpec object with M spectra
a data.frame with M rows.
It is OK for value to have 0 columns,
and value can also be NULL; see add.
If add is FALSE,
then any existing extradata is discarded and replaced by value,
except when value is NULL when x is left with no extradata.
If add is TRUE, then value is appended to the existing extradata,
except when value is NULL when x is left unchanged.
If the organization of x is not 'df.row',
then extradata cannot be stored in x and the assignment is ignored, with a warning.
First change the organization to 'df.row',
and then assign the extradata.
If the organization of x is 'df.row', but value does not have
the right number of rows, the assignment is ignored, with a warning.
metadata,
organization