R: Return both a value and its visibility

withVisible {utils}

R Documentation

Return both a value and its visibility

Description

This function evaluates an expression, returning it in a two element list containing its value and a flag showing whether it would automatically print.

Usage

withVisible(x)

Arguments

`x`	An expression to be evaluated.

Details

The argument is evaluated in the caller's context.

Value

`value`	The value of `x` after evaluation.
`visible`	logical; whether the value would auto-print.

Examples

x <- 1
withVisible(x <- 1)
x
withVisible(x)

# Wrap the call in evalq() for special handling

df <- data.frame(a=1:5, b=1:5)
evalq(withVisible(a + b), envir=df)

[Package utils version 2.5.0 Index]