[R] Function redefinition - not urgent, but I am curious

[Richard.Cotton at hsl.gov.uk]

> Suppose I write:
> 
> f1 <- function(x) x + 1
> f2 <- function(x) 2 * f1(x)
> f2(10)
> # 22
> f1 <- function(x) x - 1
> f2(10)
> # 18
> 
> This is quite obvious. But is there any way to define f2
> in such a way that we "freeze" the definition of f1?

f1 <- function(x) x+1
f1frozen <- f1
f2 <- function(x) 2*f1frozen(x)
f2(10)  # 22
f1 <- function(x) x-1
f2(10)  # 22

Regards,
Richie.

Mathematical Sciences Unit
HSL


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