[SciPy-user] derivatives of datas?
Nils Wagner
nwagner at mecha.uni-stuttgart.de
Wed Feb 8 09:53:29 CST 2006
manouchk wrote:
>Hi,
>
>I'd like to calculate derivative curve of datas. Datas is of type first column
>=X and 2nd one Y=f(X) that can be put in 2 vector (for example). I'd like to
>know if scipy provides a function data derivatives (that I would have miss?),
>more advanced than a simple point to point linear derivative, using weighted
>spline for example... ?
>
>Emmanuel
>
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>
See
interpolate.splev
splev(x, tck, der=0)
Evaulate a B-spline and its derivatives.
Description:
Given the knots and coefficients of a B-spline representation,
evaluate
the value of the smoothing polynomial and it's derivatives.
This is a wrapper around the FORTRAN routines splev and splder of
FITPACK.
Inputs:
x (u) -- a 1-D array of points at which to return the value of the
smoothed spline or its derivatives. If tck was returned from
splprep, then the parameter values, u should be given.
tck -- A sequence of length 3 returned by splrep or splprep
containg the
knots, coefficients, and degree of the spline.
der -- The order of derivative of the spline to compute (must be
less than
or equal to k).
Outputs: (y, )
y -- an array of values representing the spline function or
curve. If tck
was returned from splrep, then this is a list of arrays
representing
the curve in N-dimensional space.
Nils
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