Reputation
409
Top tag
Next privilege 500 Rep.
Access review queues
Badges
2 4
Newest
 Yearling
Impact
~17k people reached

  • 0 posts edited
  • 0 helpful flags
  • 4 votes cast
Mar
28
awarded  Yearling
Jan
27
comment Polytopes defined by $x_i >=0, Ax = b$ are generic ? (Understanding simplex method)
Yes, any vertex will have at least $(n-r)$ zero components. However, if a vertex is degenerate then an arbitrarily small change to $A$ or $b$ can result in a change to the topology of polyhedron (e.g. new vertices and edges can appear.)
Jan
27
comment Polytopes defined by $x_i >=0, Ax = b$ are generic ? (Understanding simplex method)
No, there could be more than $n-r$ components that are 0. Such a vertex and basic feasible solution are called "degenerate."
Jan
27
answered Polytopes defined by $x_i >=0, Ax = b$ are generic ? (Understanding simplex method)
Jan
4
comment Linear vs non-linear Least Squares
Note that it is possible to solve a linear least squares problem by solving a linear system of equations (the normal equations) or by using an orthogonal factorization of $A$ (QR or SVD.) Nonlinear least squares problems are solved by iterative methods.
Dec
28
comment Calculate the Gamma function Γ(2.7)
Your TI-83 PLUS probably can't do this. However, it's easy to evaluate using Wolfram Alpha. wolframalpha.com
Dec
28
answered Calculate the Gamma function Γ(2.7)
Dec
17
answered How to create an example with exponential running time for a given implementation of the simplex algorithm?
Mar
9
answered Why can we assume a certain term is $0$ in this case?
Mar
1
answered how to calculate variance on SVD parameter estimation?
Sep
24
awarded  Autobiographer
May
16
comment What's wrong with this linear program formulation?
Yes, you need to do some kind of phase I procedure to get a BFS.
May
16
answered What's wrong with this linear program formulation?
Sep
23
revised Difference between validity and satisfiability?
Fixed an "A" vs. "F" typo
Sep
23
comment Difference between validity and satisfiability?
Note that the term "valid" is also commonly used as an adjective to describe a proof in the propositional calculus. If you consider an expression in the propositional calculus to be a one line proof, then a tautology (an expression that is true under all assignments of the logical variables) is a valid proof.
Sep
23
answered Difference between validity and satisfiability?
Jun
28
answered Quadratic integer Programming
May
4
awarded  Editor
May
4
revised What does it mean to integrate with respect to the distribution function?
expanded the explanation.
May
4
answered What does it mean to integrate with respect to the distribution function?