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jobliz/deriv.py

Created March 15, 2013 02:55
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The definition of derivative "just works" when coded in a programming language.
Raw
deriv.py
# 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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