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visits | member for | 4 years, 7 months |
seen | 18 mins ago | |
stats | profile views | 386 |
I love mountainbike. I hate the Matrix Cookbook.
Apr 13 |
answered | Norm of a matrix operator with a special structure |
Apr 9 |
comment |
Finding commuting matrices
I note that somebody downvoted my edit without giving name or explanations. |
Apr 5 |
revised |
Find a line such that sum of perpendicular distances of points to the line is minimized
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Apr 5 |
answered | Find a line such that sum of perpendicular distances of points to the line is minimized |
Apr 5 |
revised |
Finding commuting matrices
deleted 129 characters in body |
Apr 4 |
answered | Finding commuting matrices |
Mar 26 |
revised |
How to calculate the square root of matrix $A+B$ perturbatively?
added 488 characters in body |
Mar 8 |
comment |
When does a matrix equation have a solution?
@ quid , @ Eric Wilson , OK this question is more than five years old. I didn't see that ( problem with my goggles ?). From a historical point of view, I think that we must keep this question on MO. |
Mar 7 |
comment |
When does a matrix equation have a solution?
I see that the research level considerably falls down. |
Mar 7 |
answered | Distinct eigenvalues of the quadratic eigenvalue problem |
Feb 7 |
revised |
Geometric mean of two matrices
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Feb 7 |
revised |
Geometric mean of two matrices
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Feb 7 |
comment |
Geometric mean of two matrices
Yes, I wrote too fast. There is also a mistake about the principal determinants of order $2$ extracted from $D_1-K,\cdots$.. |
Feb 6 |
answered | Geometric mean of two matrices |
Feb 1 |
comment |
Bits of precision matrix reconstruction
Is your LMR the LDU factorization ? Why $<1/4$ and not $<1/2$ ? If you consider LDU, then the entries of the matrices $L,U,L^{-1},U^{-1}$ are rational numbers with (I think so) numerator and denominator in $O(n)$ or, in the worst case, in $O(n^2)$. |
Jan 15 |
revised |
Solving a matrix equation $X=c \cdot AXA' +I$ with a diagonal corrections
added 207 characters in body |
Jan 15 |
answered | Solving a matrix equation $X=c \cdot AXA' +I$ with a diagonal corrections |
Jan 14 |
revised |
How to calculate the square root of matrix $A+B$ perturbatively?
added 28 characters in body |
Jan 14 |
revised |
How to calculate the square root of matrix $A+B$ perturbatively?
added 2 characters in body |
Jan 14 |
revised |
How to calculate the square root of matrix $A+B$ perturbatively?
added 7 characters in body |