On Wed, May 20, 2009 at 7:21 AM, Paulo Grahl <pgr...@gmail.com> wrote:
> A <- function(parameters) {
> # calculations w/ parameters returning 'y'
> tmpf <- function(x) { # function of 'y' }
> return(tmpf)
> }
>
> The value of the parameters are stored in an environment local to the
> function. Then I call
> x<- something
> B<-A(x)
>
> When R executes this last statement, does it perform all the
> calculations inside function A again (i.e., all the calculations that
> yield 'y')
> or the value of 'y' is already stored in the function's local environment
> ?
>
A <- function(q) {
print("calculating y")
y <- q+1
function(x) print(paste("value of x:",x,"value of y:",y))
}
> A(5)
[1] "calculating y"
function(x) print(paste("value of x:",x,"value of y:",y))
<environment: 0x07abe2a8>
> A(5)(4)
[1] "calculating y"
[1] "value of x: 4 value of y: 6"
> A5 <- A(5)
[1] "calculating y"
> A5(4)
[1] "value of x: 4 value of y: 6"
>
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