Created
March 15, 2013 02:55
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The definition of derivative "just works" when coded in a programming language.
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| # from http://funcall.blogspot.sg/2009/03/not-lisp-again.html | |
| def deriv(f, dx=.0001): | |
| return lambda x: (f(x + dx) - f(x)) / dx | |
| cube = lambda x: x**3 | |
| d = deriv(cube) | |
| for n in xrange(5): | |
| print n, d(n) | |
| # 0 1e-08 | |
| # 1 3.00030001 | |
| # 2 12.00060001 | |
| # 3 27.0009000101 | |
| # 4 48.0012000099 |
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