# Primitive

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##### Look Up a Primitive Function

.Primitive looks up by name a ‘primitive’ (internally implemented) function.

Keywords
interface
##### Usage
.Primitive(name)
##### Arguments
name

name of the R function.

##### Details

The advantage of .Primitive over .Internal functions is the potential efficiency of argument passing, and that positional matching can be used where desirable, e.g.in switch. For more details, see the ‘R Internals Manual’.

All primitive functions are in the base namespace.

This function is almost never used: name or, more carefully, get(name, envir = baseenv()) work equally well and do not depend on knowing which functions are primitive (which does change as R evolves).

.Internal.
library(base) # NOT RUN { mysqrt <- .Primitive("sqrt") c .Internal # this one *must* be primitive! if # need backticks # }