Install an expression as a function
Installs an expression in the given environment as a function, and registers
debug hooks so that breakpoints may be set in the function. Note: as of
Shiny 1.6.0, it is recommended to use quoToFunction() instead.
installExprFunction( expr, name, eval.env = parent.frame(2), quoted = FALSE, assign.env = parent.frame(1), label = deparse(sys.call(-1)[[1]]), wrappedWithLabel = TRUE, ..stacktraceon = FALSE )
expr |
A quoted or unquoted expression |
name |
The name the function should be given |
eval.env |
The desired environment for the function. Defaults to the calling environment two steps back. |
quoted |
Is the expression quoted? |
assign.env |
The environment in which the function should be assigned. |
label |
A label for the object to be shown in the debugger. Defaults to the name of the calling function. |
wrappedWithLabel, ..stacktraceon |
Advanced use only. For stack manipulation purposes; see
|
This function can replace exprToFunction as follows: we may use
func <- exprToFunction(expr) if we do not want the debug hooks, or
installExprFunction(expr, "func") if we do. Both approaches create a
function named func in the current environment.
Wraps exprToFunction(); see that method's documentation
for more documentation and examples.
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.