ndiff2   xtlang


Defined in:  https://github.com/digego/extempore/tree/v0.8.9/libs/core/math.xtm

Implementation

(bind-func ndiff2
  "numeric differentiation (2nd deriv) - central diff"
  (lambda (f:[double,double]* x)
    (/ (- (- (f (+ x 1e-5)) (f x))
          (- (f x) (f (- x 1e-5))))
       (* 1e-5 1e-5))))


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  • ndiff2    xtlang