我在下面有一个列表A，我想打印其中theta=90°的判断版本.
import sympy as sp
theta = sp.symbols('theta')
A = [sp.cos(theta), sp.sin(theta),0,0]
theta_val = sp.pi / 2
A_evaluated = [A.subs([theta, theta_val])]
print(A_evaluated)
我收到"AttributeError:List Object Has Not Attribute Subs".有没有办法修改这篇文章？
imp或t sympy as sp
theta = sp.symbols('theta')
A = [sp.cos(theta), sp.sin(theta),0,0]
theta_val = sp.pi / 2
[x.subs([(theta,theta_val)]) f或 x in A if type(x)!= int]
或
[x.subs([(theta,theta_val)]) f或 x in A if not isinstance(x, int)]
You need to type(int)!= int else you will get 'int' object has no attribute 'subs' f或 0,0.
#output
[0, 1]