Nothing
numericalDerivative <-
function(x, g, k, delta=.001) {
# numerical kth derivative of g(x)
if (k == 0) {
g(x)
} else {
(numericalDerivative(x+delta, g, k-1, delta) -
numericalDerivative(x-delta, g, k-1, delta))/
(2*delta)
}
}
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