G'day Rolf,
On Sun, 7 Nov 2021 19:33:40 +1300
Rolf Turner <[email protected]> wrote:
> library(Deriv)
> d1 <- Deriv(dnorm,"sd")
> source("d2.txt") # d2.txt is attached
>
> d1(1,0,3,TRUE) # [1] -0.2962963
> d2(1,0,3,TRUE) # [1] -0.8888889
Fascinating:
R> pryr::call_tree(body(d1))
R> pryr::call_tree(body(d2))
clearly show that the two functions have a different idea to what
expression the final "/sd" is applied too (as an earlier poster
suggested), but I have no idea why.
Deriv() seems to return the correct function, but when it is displayed,
the deparser(?) somehow omits a crucial pair of braces.
Cheers,
Berwin
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