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  • 7 votes cast
Mar
22
asked What are some real life applications of least squares problem?
Mar
22
comment Changes in singular values of matrix when rows are added
It gave me the most important idea to solve the entire problem :D Thanks so much!!!
Mar
21
accepted Changes in singular values of matrix when rows are added
Mar
21
comment Changes in singular values of matrix when rows are added
Never mind. Sorry. I got it now.
Mar
21
comment Changes in singular values of matrix when rows are added
But the theorem requires that $B$ and $C$ are both square matrix. In this case, $A$ is NOT. $A \in R^{m \text{x} n}$
Mar
20
asked Changes in singular values of matrix when rows are added
Mar
8
awarded  Critic
Mar
8
revised Trigonometry system - complex conjugate
deleted 12 characters in body
Mar
8
comment Trigonometry system - complex conjugate
it doesn't answer my question! I know how to add exponents.
Mar
8
comment Trigonometry system - complex conjugate
I understand that part but should $e^{2πimt}e^{-2πint}=e^{2πi(m-n)t}$?
Mar
8
asked Trigonometry system - complex conjugate
Mar
4
asked How to compute QR decomposition of a product of matrices
Mar
2
awarded  Tumbleweed
Feb
24
awarded  Curious
Feb
23
asked Apply Cayley transformation on vector x
Feb
23
awarded  Commentator
Feb
23
awarded  Supporter
Feb
23
comment Cayley transformation of a skew-symmetric matrix is orthogonal?
how do you show that $(I + S)(I - S)^{-1} = (I - S)^{-1}(I + S)$? That's what I don't get.
Feb
23
comment Cayley transformation of a skew-symmetric matrix is orthogonal?
I'm sorry, but I got to that part, but I couldn't turn $QQ^{T}$ into $I$. COuld you give more explanation?
Feb
23
asked Cayley transformation of a skew-symmetric matrix is orthogonal?