计算有奇异的线性方程组

zpgreatwall2

怎样在matlab中处理有奇异的线性方程？有些贴子上提到用null函数处理“
use null function;
for: AX=0
follow this:
b=null(A);
b'*b=1”
不知是什么意思？

catny

我刚看了一下null的help，我想是进行了正交化处理，建议你看看高等代数的书获取相关知识

ylgdiy

Z = null(A) is an orthonormal basis for the null space of A obtained from the singular value decomposition. That is, A*Z has negligible elements, size(Z,2) is the nullity of A, and Z'*Z = I.