在SymPy中访问符号块矩阵的不同块(子矩阵

from sympy import Matrix, block_collapse

# 创建一个符号块矩阵
A = Matrix([[1, 2, 3, 4],
            [5, 6, 7, 8],
            [9, 10, 11, 12],
            [13, 14, 15, 16]])

# 访问符号块矩阵的不同块
block1 = block_collapse(A[:2, :2])  # 第一个2x2块
block2 = block_collapse(A[:2, 2:])  # 第二个2x2块
block3 = block_collapse(A[2:, :2])  # 第三个2x2块
block4 = block_collapse(A[2:, 2:])  # 第四个2x2块

# 打印结果
print("Block 1:")
print(block1)
print("Block 2:")
print(block2)
print("Block 3:")
print(block3)
print("Block 4:")
print(block4)

Block 1:
Matrix([
[1, 2],
[5, 6]])
Block 2:
Matrix([
[3, 4],
[7, 8]])
Block 3:
Matrix([
[ 9, 10],
[13, 14]])
Block 4:
Matrix([
[11, 12],
[15, 16]])