[Scipy-tickets] [SciPy] #1285: polyfit documentation is wrong
SciPy Trac
scipy-tickets@scipy....
Thu Sep 23 10:32:33 CDT 2010
#1285: polyfit documentation is wrong
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Reporter: meawoppl | Owner: somebody
Type: defect | Status: new
Priority: normal | Milestone: 0.9.0
Component: Other | Version: 0.7.0
Keywords: whatthedoc? |
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In [38]: a = arange(50)
In [39]: polyfit(a,a,1)
Out[39]: array([ 1.00000000e+00, 3.33920544e-15])
The 0th element is clearly the slope, and the 1st the intercept.
In the documentation it states that:
. . .
Fit a polynomial ``p(x) = p[0] * x**deg + ... + p[deg]`` of degree `deg`
to points `(x, y)`. Returns a vector of coefficients `p` that minimises
(Spelled wrong!) the squared
. . .
Where the polynomial ought to be reversed in the degrees. It notably says
that the highest power terms come first, so it even contradicts itself!
--
Ticket URL: <http://projects.scipy.org/scipy/ticket/1285>
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