矩阵的秩求法——只用初等行变换变成阶梯型
>>
>> A1=[1,-1,2,1,0;2,-2,4,-2,0;3,0,6,-1,1;0,3,0,0,1]
A1 =
1 -1 2 1 0
2 -2 4 -2 0
3 0 6 -1 1
0 3 0 0 1
>>
>>
>>
>>
>>
>> rank(A1)
ans =
3
>>
>>
原文：https://www.cnblogs.com/herd/p/13548882.html