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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
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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?
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Jan
14
revised How to calculate the square root of matrix $A+B$ perturbatively?
added 7 characters in body