keyvalue {decoder}

Coerce to a keyvalue object

Description

Functions to check if an object is a keyvalue object, or coerce it if possible.

Usage

as.keyvalue(x, ...)

## S3 method for class 'data.frame'
as.keyvalue(x, standard_var_names = NULL, ...)

## Default S3 method:
as.keyvalue(x, y, ...)

is.keyvalue(x)

Arguments

x

object to test for, or coerce to, keyvalue (see the details).

...

arguments passed between methods

standard_var_names

a character vector with standard names for variables decoded with this key-values.

y

a value vector if x is an unnamed vector (argument must be named 'y = .')

Details

x can be of:

• a name of a package internal (or external) keyvalue object (character of length one)

• a data.frame with two columns "key" (with unique cells) and "value".

• a list as described in as.keyvalue.list

• a named vector with all names unique

• an unnamed vector with unique cells if supplemented by additional vector (y)

Value

as.keyvalue returns a data.frame with additional class keyvalue that fulfills the requirements for a keyvalue object and with the key column as character. It also has two extra attributes standard_var_names as described above and keyvalue11 which is TRUE for keyvalue objects with a 1:1 relation between its keys and values (otherwise FALSE).

See Also

as.keyvalue.list, decode, summary.keyvalue, key_and_value

Examples

snomed2 <- as.keyvalue(snomed)
is.keyvalue(snomed2)
summary(snomed2)