pwtools.num.PolyFit1D

class pwtools.num.PolyFit1D(*args, **kwds)

Bases: Fit1D, PolyFit

1D special case version of PolyFit which handles 1d and scalar points Also get_min() uses the root of the poly’s 1st derivative instead of fmin().

__init__: points (npoints,1) or (npoints,)

__call__: points (npoints,1) or (npoints,) or scalar

Examples

>>> x=np.linspace(-5,5,10); y=(x-1)**2+1
>>> f=num.PolyFit1D(x,y,2)
>>> f(0)
2.0000000000000009
>>> f.get_min()
1.0
>>> xx = linspace(x[0],x[-1],50)
>>> plot(x,y,'o', label='data')
>>> plot(xx, f(xx), label='poly')
>>> plot(xx, f(xx,der=1), label='d(poly)/dx')
>>> legend()

__init__(*args, **kwds)

Parameters:

PolyFit (See)

__call__(points, **kwds)

Call self as a function.

Methods

get_max([x0, xab])	Convenience method.
get_min([x0, xab])	Return x where y(x) = min(y) by calculating the root of the fit's 1st derivative (by calling self(x, der=1)).
get_root([x0, xab])	Return x where y(x) = 0 by calculating the root of the fit function.
is_mono()	Return True if the curve described by the fit function f(x) is monotonic.