On Wednesday, December 14, 2011, Fabien Lafont <lafont.fab...@gmail.com>
wrote:
> I have a basic problem (I think)
>
> I try to fit some data with this function
>
http://docs.scipy.org/doc/numpy/reference/generated/numpy.polynomial.Chebyshev.fit.html
>
> But it return an error:
>
> fit = chebyshev.fit(T,R,3)
> NameError: name 'chebyshev' is not defined
>
> I don't understand I've imported Numpy and polynomials... An Idea?
>
>
> import math
> from numpy import *
> from numpy import polynomial
> from pylab import *
> from scipy import *
> from scipy import optimize
> import warnings
> warnings.simplefilter('ignore', np.RankWarning)
>
>
> R = [ 9011.5 , 7822.7 , 6253.9 , 4877.56 , 3892.08 ,
> 3221.41 , 2647.05,
> 2260.94 , 1959.72 , 1712.06 , 1522.28 , 1367.87 , 1242.953
> , 1185.092,
> 1104.452 , 1031.862 , 919.8644 , 832.9942 , 767.8944 , 715.1569,
> 671.6301 , 635.1634 , 604.284 , 577.5536]
>
> T = range(0,len(R))
> plot (T,R,".")
> show()
> fit = chebyshev.fit(T,R,3)
> print fit
>
The function would be in the "polynomial" namespace. So
"polynomial.chebyshev()" would work. To reduce typing, you can import a
module "as" some other name.
from numpy import polynomial as poly
..
fit = poly.chebyshev.fit(T,R,3)
Importing modules is very flexible and I suggest reading up on it.
Ben Root
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