[pygsl-discuss] pygsl.import_all()

[N. V. <mit...@we...>]

Hello everyone,

I am new to this list, so first of all thanks for your nice efforts to 
provide python wrappers for the gsl!

As I have just started to try out everything, I stumbled upon the 
following minor bug: The documentation says, that pygsl.diff is 
deprecated and that you should use pygsl.deriv instead. But when using 
pygsl.import_all(), you only get .diff added to the pygsl namespace.

Maybe you can also help me with a probably very simple to answer 
question which I could not yet figure out from the example.  The 
following will return the derivative of cos(x) at x=0:

<SNIP>

import Numeric
from pygsl import deriv

def f(x,y):
    return Numeric.sin(x)
(result, error) = deriv.central(f, 0, 1)
print result

</SNIP>


OK, but how could I find the derivative of an arbitrary dataset? The 
following e.g. will create two arrays x, y that represent some points of 
a sin.

<SNIP>
a = Numeric.arange(-10,10)
x = a
y = Numeric.sin((a/20.0) * 6.28)
</SNIP>

My guess would be that I need to create an interpolation myself... ?

Best regards,

Niklas Volbers.