Copyright (C) 2010-2020 Luke Olson
Copyright (C) 2020 Andreas Kloeckner
MIT LicensePermission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import numpy as np import numpy.linalg as la import matplotlib.pyplot as pt
x = np.linspace(0, 1, 200)
Now plot the monomial basis on the interval [0,1] up to $x^9$.
n = 10 for i in range(n): pt.plot(x, x**i) pt.vlines(np.linspace(0, 1, n), 0, 1, alpha=0.5, linestyle="--")
<matplotlib.collections.LineCollection at 0x7f6d60f82c88>
- How do the entries of the Vandermonde matrix relate to this plot?
- Guess the condition number of the Vandermonde matrix for $n=5,10,20$:
n = 5 V = np.array([np.linspace(0, 1, n)**i for i in range(n)]).T la.cond(V)