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)] )My initial example wasn't that good. 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).
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: 3 years ago
Seen: 395 times
Last updated: Dec 04 '21
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