## Environment Access

## Usage

    environment(fun = NULL)
    environment(fun) <- value
    is.environment(obj)
    .GlobalEnv

## Arguments

`fun` | a `function` or `NULL`, which is the default.

## Value

If `fun` is a function then `environment(fun)` returns the environment associated with that function. If `fun` is `NULL` then the global environment, `.GlobalEnv`, is returned.

The assignment form sets the environment of the function `fun` to the `value` given. `is.environment(obj)` returns `TRUE` iff `obj` is an `environment`.

## See Also

The `envir` argument of `eval`.

## Examples

    ##-- all three give the same:
    environment()
    environment(environment)
    .GlobalEnv

    ls(envir=environment(approxfun(1:2,1:2, method="const")))

    is.environment(.GlobalEnv)# T

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