I am having some troubles looking for several hours how to calculate the range of a multivariate function with sympy.
Let's say I would like to calculate the range of the following function f in sympy:
>>> x,y = symbols('x y')
>>> f = x*y
Plus, assume I know x€[0,1] and y€[-1,1].
Does any method exist to get easily the range of f on account of x's and y's bounds ?
Thank you !
PS : I know the method function_range already exists, but it looks like it works only for monovariate function.
An existing method implemented in sympy A little program that could do what I want