python 用simpy sympy.core.relational.Equality解方程

mathfux 2020-08-28 18:42

刚开始时，您有3个未知变量和2个方程，因此可以为S和求解D。包含3对形式为（f（V），g（V））的解决方案，其中f和g是包含V的表达式。然后，您可以迭代这些对并使用替换：

import sympy as sp
S, D, Vdu = sp.symbols('S D Vdu')

eq1 = sp.Eq(S, D)
eq2 = sp.Eq(Vdu, sp.pi**2*S*D**2/4)

solution = sp.solve((eq1, eq2), (S, D))
substituted_solution = [(s.subs({Vdu : 250e-6}), d.subs({Vdu : 250e-6})) for s, d in solution]

guiprado 1970-01-01 08:00:00

非常感谢您使用.subs（）。subs（）进行了两次替换解决了问题，但是您的方法对我来说更有用。我非常感谢，再次感谢:)

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python - 用simpy sympy.core.relational.Equality解方程

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