[R] monitor variable change

[Alaios]

Dear all I would like to ask you if there is a way in R to monitor in R when a value changes. 

Right now I use the sprintf('my variables is %d \n, j) to print the value of the variable. 

Is it possible when a 'big' for loop executes to open in a new window to dynamically check only the variable I want to.

If I put all the sprintf statements inside my loop then I get flooded with so many messages that makes it useless.  

Best Regards
Alex