Print polynomial in variable format in python

问题

from numpy import linalg,dot
import numpy.polynomial.polynomial as poly
x7=poly.Polynomial([1,2])
print x7

according to above code in python it should print 1 + 2x^2, but it is printing poly [1. 2.]. Please help.

回答1:

I'd recommend using numpy.poly1d and numpy.polymul, where the coefficients are a0*x2 + a1*x + a2.

For example, to represent 3*x**2 + 2*x + 1:

p1 = numpy.poly1d([3,2,1])

therefor for your problem you could use:

p2= numpy.poly1d([2,0,1])
print p2

and printing p2 will represent: 1 + 2x^2

来源：https://stackoverflow.com/questions/33304178/print-polynomial-in-variable-format-in-python