[SciPy-user] derivative

Stephen Walton stephen.walton at csun.edu
Wed Feb 23 08:02:04 CST 2005

Nils Wagner wrote:

> Hi all,
> Is it somehow possible to improve the accuracy of derivative ?

Higher order?

from scipy import *

def func(x):
  return exp(2*x)

for i in arange(1,6):
 print i,' derivative of exp(2*x) at x=0',d,'exact',2**i
 print '   rel error %e' % (d/2**i - 1)

Changing the order to 9 improves the accuracy of the 6th derivative from 
1e-4 to 3e-7.

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