[R] Argument visible of addTaskCallback

Eric Lecoutre lecoutre at stat.ucl.ac.be
Thu Jun 20 15:03:27 CEST 2002


Hello,

I have a question about addTaskCallback

It is said that the argument visible allows to know wether the result of 
the top-level evaluation was printed or not.

Nevertheless, in the following example, I encountered a problem, as it 
seems not all printed objects are visible...

Could someone tell me where is the tip?

TIA


-----------------------------------------------------------------------------
SimpleTask <- function()	{
	function(expr,value,ok,visible){
		print(visible)
		return(TRUE)  }		}
	
 > addTaskCallback(SimpleTask())

 > x<-rnorm(10)
	[ Visible= FALSE]
 > x
	[ Visible= TRUE]
 > summary(x)
	[ Visible= FALSE] !!
-----------------------------------------------------------------------------

Eric Lecoutre

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