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 Mar22 asked What are some real life applications of least squares problem? Mar22 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!!! Mar21 accepted Changes in singular values of matrix when rows are added Mar21 comment Changes in singular values of matrix when rows are added Never mind. Sorry. I got it now. Mar21 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. $A \in R^{m \text{x} n}$ Mar20 asked Changes in singular values of matrix when rows are added Mar8 awarded Critic Mar8 revised Trigonometry system - complex conjugate deleted 12 characters in body Mar8 comment Trigonometry system - complex conjugate it doesn't answer my question! I know how to add exponents. Mar8 comment Trigonometry system - complex conjugate I understand that part but should $e^{2πimt}e^{-2πint}=e^{2πi(m-n)t}$? Mar8 asked Trigonometry system - complex conjugate Mar4 asked How to compute QR decomposition of a product of matrices Mar2 awarded Tumbleweed Feb24 awarded Curious Feb23 asked Apply Cayley transformation on vector x Feb23 awarded Commentator Feb23 awarded Supporter Feb23 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. Feb23 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? Feb23 asked Cayley transformation of a skew-symmetric matrix is orthogonal?