| withVisible {base} | R Documentation |
This function evaluates an expression, returning it in a two element list containing its value and a flag showing whether it would automatically print.
withVisible(x)
x |
an expression to be evaluated. |
The argument, not an expression object, rather
an (unevaluated function) call, is evaluated in the
caller's context.
This is a primitive function.
value |
The value of |
visible |
logical; whether the value would auto-print. |
invisible, eval;
withAutoprint() calls source() which
itself uses withVisible() in order to correctly
“auto print”.
x <- 1 withVisible(x <- 1) # *$visible is FALSE x withVisible(x) # *$visible is TRUE # Wrap the call in evalq() for special handling df <- data.frame(a = 1:5, b = 1:5) evalq(withVisible(a + b), envir = df)