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2Â¥2012-05-12 11:23:49
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3Â¥: Originally posted by lijie169 at 2012-05-12 20:37:42:
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4Â¥2012-05-13 20:58:20
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You can compute finite difference of f(x), for example, for a sequence of h->0, compute df(x)h, and compare to f(x+h)-f(x), and f(x)-f(x-h), calculate the remainder R_h = max(abs((f(x+h)-f(x))/h-df(x)), abs((f(x)-f(x-h))/h-df(x)))
if f(x) is second order differentiable, then R_h should be first order in h,
if f(x) is only first order differentiable, then R_h is only bounded,
if f(x) is discontinuous at h, then R_h is unbounded.
Of course, I assume you know the exact form of f(x) and f'(x), f"(x)...
5Â¥2012-05-13 22:43:39
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