替换矩阵内的符号

Question

我有一个包含符号的矩阵：

import random
from random import sample
rows=20
a,b = 0.5,1 
pop=list(zip(sample(range(1, 100000), rows),sample(range(1, 100000), rows)))
profit = sample(range(1, 100000), rows)
#print(pop,profit)
mycombined=list(zip(pop,profit))
combined_array = np.asarray(mycombined)

print(combined_array)

m = len (combined_array) 
it = 1500 
#alpha = 0.01 

J=0
for i in range(1,m,1): 
     bpop=combined_array[i][0][0]
     apop=combined_array[i][0][1]
     aprofit=combined_array[i][1]
     temp=(bpop+apop-aprofit)**2
     J=J+temp

我想用数字替换所有符号“t”。

提前致谢。

Answer 1

A = sympy.Matrix([[sympy.exp(t),1,-1], [0,t,0], [0,t+1,0]]) # fixing your expression
print(A.subs(t, 5))

哪个给了

Matrix([
[exp(5), 1, -1],
[     0, 5,  0],
[     0, 6,  0]])