有几题观念想请教一下
第6题
Which of the following statements are true?
选项(B)
The shortest (minimal 2-norm) least-squares solution to a problem Ax=b
must be in the row space of A
这个选项答案给对
我知道least squares solution 也知道minimal 2-norm solution
那他合在一起是指什么意思，如果是指minimal solution不是应该在R(A^T)内吗?
还是R(A^T) = row space of A ?? 观念不太好不好意思
另外第8题 [2 3 1 5]
Given a matrix A = [2 3 0 4], which of the following statements are TRUE?
[0 0 1 1]
选项(E)
If the two systems Ax=b and Ax=c have the same shortest(minimal 2- norm)
least squares solution, then the projections of b and c onto the column
space of A must be identical.
请问为什么这个选项也对?
谢谢