Hi,
Suppose I have an arbitrary function:
arbfun<-function(x) {...}
Is there a robust implementation of a numerical derivative routine in R
which I can use to take it's derivative ? Something a bit more than
simple division by delta of the difference of evaluating the function at
x and x+delta...
Perhaps there is a way to do this using D or deriv but I could not
figure it out. Trying:
eval(deriv(function(x) arbfun(x),"x"),1)
does not seem to work.
Thanks,
Tolga
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