#範例8-3：用sympy求矩陣的rank
#線性代數的rank=秩 = A.rank()
#矩陣A的變數n數目=', A.shape[1]
from sympy import *
A = Matrix([
    [-1,2,0,4,5,-3],
    [3,-7,2,0,1,4],
    [2,-5,2,4,6,1],
    [4,-9,2,-4,-4,7]
    ])
rankA = A.rank()
print('矩陣A的rank=',rankA)
print('矩陣A的變數n數目=', A.shape[1])