[Help-gsl] derivative of a data set

[Eric Germaneau]

Hello,

I wish to use gsl in oder to perform the derivative of a data set 
contains in an one dimensional array.
It seems that gsl numerical differentiation estimate the derivative of 
function only.
Does anyone as an idea?
Do I have to do it "by hand" using for example u'(x) = ( u(x+h) - u(x) ) 
/ h?
Thanks in advance,

                                  Eric.


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Eric Germaneau <http://lcr.epfl.ch/page37437.html> 
<http://lcr.epfl.ch/page37437.html>

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