Is there any way of extracting a common factor of all terms in a list of symbolic expressions?
For example, in the following list
[x^4*cos(x), x^3*cos(x), x^2*cos(x)*sin(x)]
such function should return x^2*cos(x). And for
[1/x^4*cos(x), 1/x^3*cos(x), 1/x^2*cos(x)*sin(x)]
it should return 1/x^2*cos(x).
This can be done by calling:
gcd( [x^4*cos(x), x^3*cos(x), x^2*cos(x)*sin(x)] )
You can use:
gcd(map(numerator, mylist)) / gcd(map(denominator, mylist))
Using the @Max Alekseyev suggestion I was able to write a simple python function that solves the problem.
def common_factor(expr_list):
numerators, denominators = zip(*[expr.numerator_denominator() for expr in expr_list])
return gcd(numerators)/gcd(denominators) Asked: 2021-12-04 01:35:10 +0100
Seen: 324 times
Last updated: Dec 04 '21
Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.