Mr.Guo

2019
Sep
4
awarded Popular Question
May
22
comment how to apply qr decomposition while keep top left block un-change?
ok thank you any way :)
May
21
comment how to apply qr decomposition while keep top left block un-change?
also for the second case , like : $Q* \begin{bmatrix} D & 0 & E \\ B & A & C \\ 0 & 0 & F \end{bmatrix} = \begin{bmatrix} G & H & I \\ 0 & L & J \\ 0 & 0 & K \end{bmatrix} \approx \begin{bmatrix} G & H & I \\ 0 & A & J \\ 0 & 0 & K \end{bmatrix}$
May
21
comment how to apply qr decomposition while keep top left block un-change?
as your advice, I plan to modify my method by : $Q*\begin{bmatrix}A & B\\ 0 & C \\ D & E\end{bmatrix} = \begin{bmatrix} H & F \\ 0 & G \\ 0 & 0 \end{bmatrix} \approx \begin{bmatrix} A & F \\ 0 & G \\ 0 & 0 \end{bmatrix}$ what's your opinion ? actually I'm planning to achieve the schmidt-kalman filter by qr method, in skf method , the covariance is updated but some block is not changed, maybe I could apply qr decom while keep A not changed, I think they are equivalent operations , right ?
May
21
comment how to apply qr decomposition while keep top left block un-change?
thank you for your advise , I think I have mistaken the gauss elimination operation as an orthogonal transform.
May
20
revised how to apply qr decomposition while keep top left block un-change?
added 665 characters in body
May
20
asked how to apply qr decomposition while keep top left block un-change?
May
15
comment Error while building OpenCV :: MonitorFromRect was not declared in this scope
I have met the same problem as you with opencv3.2 , your solution is working :) thx
Apr
19
awarded Curious
Apr
18
comment strange memory behave of resize and reserve about vector
@VTT for example ?
Apr
18
revised strange memory behave of resize and reserve about vector
added 61 characters in body; edited tags
Apr
18
asked strange memory behave of resize and reserve about vector
Jan
26
asked how to update QR decomposition like cholesky decomposition
Jan
26
awarded Supporter
Jan
7
comment the inverse of a sum of two symmetric for schur completion?
I mean Eigen have no good interface for up-triangulate matrix rank-one update :)
Jan
7
revised the inverse of a sum of two symmetric for schur completion?
edited body
Jan
7
awarded Commentator
Jan
7
comment the inverse of a sum of two symmetric for schur completion?
@Omnomnomnom thank you for your effort , I have listed the detail below
Jan
7
accepted the inverse of a sum of two symmetric for schur completion?
Jan
7
comment the inverse of a sum of two symmetric for schur completion?
cholesky factor update is a good idea, I'm using eigen , but I didn't find the rank one update for C, it only have interface for C'C which need mutiply first, so I think @Omnomnomnom 's idea is more fitting for me :) , I have listed the detail below