BiocGenerics (version 0.18.0)

eval: Evaluate an (unevaluated) expression

Description

eval evaluates an R expression in a specified environment.

NOTE: This man page is for the eval S4 generic function defined in the BiocGenerics package. See ?base::eval for the default method (defined in the base package). Bioconductor packages can define specific methods for objects not supported by the default method.

Usage

eval(expr, envir=parent.frame(), enclos=if (is.list(envir) || is.pairlist(envir)) parent.frame() else baseenv())

Arguments

expr

An object to be evaluated. May be any object supported by the default method (see ?base::eval) or by the additional methods defined in Bioconductor packages.

envir

The environment in which expr is to be evaluated. May be any object supported by the default method (see ?base::eval) or by the additional methods defined in Bioconductor packages.

enclos

See ?base::eval for a description of this argument.

Value

See ?base::eval for the value returned by the default method.Specific methods defined in Bioconductor packages should behave as consistently as possible with the default method.

See Also

• base::eval for the default eval method.

• showMethods for displaying a summary of the methods defined for a given generic function.

• selectMethod for getting the definition of a specific method.

• eval,expression,Vector-method in the IRanges package for an example of a specific eval method (defined for when the expr and envir arguments are an expression and a Vector object, respectively).

• BiocGenerics for a summary of all the generics defined in the BiocGenerics package.

Examples

eval  # note the dispatch on 'expr' and 'envir' args only
showMethods("eval")
selectMethod("eval", c("ANY", "ANY"))  # the default method