[BioC] How to conditionally exit from a function?

[SHEN, WEICHENG .]

Hi all:

I need to conditionally exit from a function, but don't know how. My example
below indicates that when x>0, I wish to immediately exit from the function
foo. I also with to return a flag value so that I could find out what
happend in executing this function. What command I can use to make it
happen? Your help and suggestions will be greatly appreciated. Thanks!

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===================================

foo<-function (x)
{
	if (x>0) {
		do something ....
	} else {
#		need to exit from this function at this point, and also
return a flag value
	}
	do something ...
}

Weicheng Shen, Ph.D.
Senior Image Analyst
Science Applications International Corporation
1710 SAIC Drive
Mail Stop 2-6-9
McLean, VA 22102
(703) 676-4189