is.object

From base v3.3 by R-core R-core@R-project.org

Is an Object ‘internally classed’?

A function rather for internal use. It returns TRUE if the object x has the R internal OBJECT bit set, and FALSE otherwise. The OBJECT bit is set when a "class" attribute is added and removed when that attribute is removed, so this is a very efficient way to check if an object has a class attribute. (S4 objects always should.)

Keywords: classes, methods

Usage

is.object(x)

Arguments

x: object to be tested.

Note

This is a primitive function.

Examples

library(base)

is.object(1) # FALSE
is.object(as.factor(1:3)) # TRUE

Documentation reproduced from package base, version 3.3, License: Part of R @VERSION@

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