oce (version 1.0-1)

[[,oce-method: Extract Something From an oce Object

Description

The named item is sought first in metadata, where an exact match to the name is required. If it is not present in the metadata slot, then a partial-name match is sought in the data slot. Failing both tests, an exact-name match is sought in a field named dataNamesOriginal in the object's metadata slot, if that field exists. Failing that, NULL is returned.

The full contents of the metadata slot of an object named x are returned with x[["metadata"]], and x[["data"]] does the same thing for the data slot. Even if the full contents are not needed, this scheme can be useful in circumventing the searching scheme described in the previous paragraph, e.g. x[["data"]]$longitude might be used to select longitude from the data slot of x, as an alternative to oceGetData(x,"longitude").

To get information on the specialized variants of this function, type e.g. ?"[[,adv-method" for information on extracting data from an object of adv-class.

Usage

# S4 method for oce
[[(x, i, j, ...)

Arguments

x

An oce object

i

The item to extract.

j

Optional additional information on the i item.

...

Optional additional information (ignored).

Examples

# NOT RUN {
data(ctd)
ctd[["longitude"]] # in metadata
head(ctd[["salinity"]]) # in data
data(section)
summary(section[["station", 1]])
# }