[SciPy-user] derivative

[Stephen Walton]

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):
 d=derivative(func,0.0,dx,i,order=9)
 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.