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Jun
10
reviewed Reject Is a subset of an inner product space also an inner product space?
Jun
9
answered Best percentage change for trend
Jun
9
revised How to find an optimal solution for a missing player in a double-elimination tournament
retag, has nothing to do with optimization
Jun
9
comment How to find an optimal solution for a missing player in a double-elimination tournament
You should be more specific in your question. What is the goal, what are the relevant dimensions of the "best way"? Without further information any of the following might be feasible: (a) let G go on alone, (b) let G find a new partner, (c) disqualify G and let the previously losing team advance...
Jun
8
comment How to find the maximum point of a function with four dimensional variable.
Why not compute the entire profile $(x_1,x_2,x_3,x_4)$ via numerical optimization in matlab? Why the other steps? Also: in step 1 you calculate the "optimum" via the first order condition, but if your function is not concave, then this approach need not yield a maximum - maybe that is what causes the problem. In principle it should be fine to find the optimal values of $x_1,x_2$ as functions of $x_3,x_4$ and then vary $x_3,x_4$ to find a global maximum, but again it need not be valid to find those $x_1,x_2$ via first order condition.
Jun
4
comment Averaging Models in Excel
Maybe whichever number you are more confident in should get a higher weight. Otherwise: principle of insufficient reason, same weight.
Jun
3
reviewed Approve Prob. 8, Sec. 3.10 in Kreyszig's functional analysis book: An isometric linear operator has its adjoint as its left inverse
Jun
1
revised 3-d probability density with a line of maxima
added 89 characters in body
Jun
1
answered 3-d probability density with a line of maxima
Jun
1
reviewed Approve Find the curve, given that $r'(t) = Cr(t)$
Jun
1
reviewed Reject Induced map on simplices from order-preserving maps between finite ordinal numbers
Jun
1
answered Ratio laying within the confidence interval still being depicted as having an influence?
May
27
reviewed Approve Probability of drawing a pair of brown socks
Apr
22
reviewed Approve Minimum Volume of a circular, right cone, with a sphere inscribed in it.
Apr
22
comment How do I weight votes based on number of possible voters?
Nice! But it is hardly THE solution, merely A (albeit elegant) solution.
Apr
22
reviewed Approve Summation of trigonometric series
Apr
22
reviewed Approve How to prove $\operatorname{Span}(\operatorname{Span}(S)) = \operatorname{Span}(S)$
Apr
20
comment Non-uniqueness of worst-case (max-min or min-max) optimization
I think I was unclear before, so I edited and tried to give you the rough steps you could take to find the policy that maximizes the worst possible outcome. I hope this helps!
Apr
20
revised Non-uniqueness of worst-case (max-min or min-max) optimization
added 525 characters in body
Apr
18
comment Gross Substitutes under continuous perturbations
Could you provide a definition of the gross substitute property?