On Fri, 15 Jan 2010, Barry Rowlingson wrote:
On Fri, Jan 15, 2010 at 6:57 AM, Ted Harding
<ted.hard...@manchester.ac.uk>wrote:
There is at least one context where the distinction must be
preserved. Example:
pnorm(1.5)
# [1] 0.9331928
pnorm(x=1.5)
# Error in pnorm(x = 1.5) : unused argument(s) (x = 1.5)
pnorm(x<-1.5)
# [1] 0.9331928
x
# [1] 1.5
Ted.
I would regard modifying a variable within the parameters of a function
call as pretty tasteless. What does:
foo(x<-2,x)
or
foo(x,x<-3)
do that couldn't be done clearer with two lines of code?
It allows the lazy evaluation mechanism to determine whether the assignment
happens. That would be very hard to do in two lines of code.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
tlum...@u.washington.edu University of Washington, Seattle
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