# [Numpy-discussion] numpy.polynomial.chebyshev (not) in the docs

David Goldsmith d.l.goldsmith@gmail....
Tue Feb 9 20:30:12 CST 2010

```Are you talking about absence in the Wiki or absence in a NumPy executable.
They're in the former (I've been editing them), and they're in 1.4.0 of the
latter:

>>> import numpy as N
>>> N.version.version
'1.4.0'
>>> from numpy.polynomial import chebyshev as C
>>> help(C.chebfit)
Help on function chebfit in module numpy.polynomial.chebyshev:

chebfit(x, y, deg, rcond=None, full=False)
Least squares fit of Chebyshev series to data.

Fit a Chebyshev series ``p(x) = p[0] * T_{deq}(x) + ... + p[deg] *
T_{0}(x)`` of degree `deg` to points `(x, y)`. Returns a vector of
coefficients `p` that minimises the squared error.

Parameters
----------
x : array_like, shape (M,)
x-coordinates of the M sample points ``(x[i], y[i])``.
y : array_like, shape (M,) or (M, K)
y-coordinates of the sample points. Several data sets of sample
points sharing the same x-coordinates can be fitted at once by
passing in a 2D-array that contains one dataset per column.
Etc.

What version of NumPy are you running?

DG

On Tue, Feb 9, 2010 at 4:40 PM, <josef.pktd@gmail.com> wrote:

> Similar to the recfunctions, I also don't find the new chebychev
> polynomials in the docs.
>
> Are they linked from any rst file?
>
> A search in the online sphinx html docs comes up empty, and
>
> http://docs.scipy.org/numpy/docs/numpy-docs/reference/routines.poly.rst/#routines-poly
> doesn't link to the new functions.
>
> The docstrings look nice but maybe nobody sees them.
>
> Josef
> _______________________________________________
> NumPy-Discussion mailing list
> NumPy-Discussion@scipy.org
> http://mail.scipy.org/mailman/listinfo/numpy-discussion
>
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