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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