r****y
发帖数: 1437 | 1 For a square matrix Amn,
For any i, mean(A(i, :)) = 0
Can we infer det(A) very close to 0 from this condition?
Thanks in advance. | m****n
发帖数: 45 | 2 I think this is true.
det(A)=0 because every column is equal to the negative of the sum of the other
columns
【在 r****y 的大作中提到】
: For a square matrix Amn,
: For any i, mean(A(i, :)) = 0
: Can we infer det(A) very close to 0 from this condition?
: Thanks in advance.
| w**d
发帖数: 2334 | 3 det(A) =0, because 1st column will be zero if adding all others to it.
【在 r****y 的大作中提到】
: For a square matrix Amn,
: For any i, mean(A(i, :)) = 0
: Can we infer det(A) very close to 0 from this condition?
: Thanks in advance.
| r****y
发帖数: 1437 | 4 Yeah, thank. //sigh, forgot almost all linear algebra la.
【在 w**d 的大作中提到】
: det(A) =0, because 1st column will be zero if adding all others to it.
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