Alberto Vieira Ferreira Monteiro <[EMAIL PROTECTED]> writes:
> Why this kind of assignment does not work?
>
> n <- 1
> f <- ifelse(n == 1, sin, cos)
> f(pi)
It's not supposed to.
'ifelse' returns a value with the same shape as 'test' which is
filled with elements selected from either 'yes' or 'no' depending
on whether the element of 'test' is 'TRUE' or 'FALSE'.
which makes very little sense if yes and no are functions.
> this must be rewritten as:
>
> n <- 1
> f <- cos
> if (n == 1) f <- sin
> f(pi)
No, it must not.
n <- 1
f <- if (n==1) sin else cos
f(pi)
or even
(if (n==1) sin else cos)(pi)
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