SymPy:将符号/变量限制为间隔 [英] SymPy: Limit symbol/variable to interval

问题描述

使用SymPy，是否可以将符号/变量的可能值限制在某个范围内?现在，我可以在定义符号时设置一些属性，例如positive=True，但是我需要更多的控制权，即我需要将其设置为[0,1].然后应将此假设用于求解，简化等.

Using SymPy, is it possible to limit the possible values of a symbol/variable to a certain range? I now I can set some properties while defining symbols, like positive=True, but I need more control, i.e. I need to set it to be in the interval [0,1]. This assumption should then be used for solving, simplifying etc.

推荐答案

您可以将边界指定为不等式，例如x >= lb和x <= ub，例如:

You can specify the bounds as inequalities such as x >= lb and x <= ub, for example:

from sympy.solvers import solve
from sympy import Symbol
x = Symbol('x')
solve([x >= 0.5, x <= 3, x**2 - 1], x)

在这里我们搜索方程式x**2 == 1的解，以使x在区间[0.5, 3]中.

Here we search for a solution of equation x**2 == 1 such that x is in the interval [0.5, 3].

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