Hello,
2L is an integer, 2 might be or not. In the case of apply(), there is no
difference.
All possible values for margin? Any possible(*) combination of the
dimensions of 'x' in
apply(x, margin, function)
(*) non-null. If, say, x <- array(0, dim=c(2,3,4)) (3dim) then you can
call any of
apply(x, 1, fun) or apply(x, 2, fun) or apply(x, 3, fun) but not margin=4;
apply(x, 1:2, fun) or apply(x, c(1, 3), fun) or ...
apply(x, 1:3, fun)
Hope this helps,
Rui Barradas
Em 22-06-2012 23:23, Luba G escreveu:> What is the difference of using 2L versus 2 as the margin argument in the
> apply() function? Where can I find detailed information on all of the
> possible margin arguments?
>
>> x
> [,1] [,2]
> [1,] 1 2
> [2,] 3 4
> [3,] 5 6
> [4,] 7 8
> [5,] 9 10
>> sqrt(apply(x, *2L*, function(r.st) var(r.st[!is.na(r.st)])))
> [1] 3.162278 3.162278
>> sqrt(apply(x,* 2*, function(r.st) var(r.st[!is.na(r.st)])))
> [1] 3.162278 3.162278
>
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