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MIPKAPPAFREQ

Description
Branch and Bound: Specifies how frequently the basis condition number (also known as kappa) should be calculated during the branch-and-bound search.
Type
Integer
Values
0 
Do not calculate condition numbers.
1 
Calculate conditions numbers on every node, including after each round of root cutting.
n>1 
Calculate a condition number once per node of every n'th level of the branch-and-bound tree.
Default value
0
Note
The condition number is calculated as the norm of the basis matrix multiplied by the norm of its inverse. This uses the Froebenius norm.
Note
A summary will be printed at the end of the solve, summarizing the collected condition numbers collected:

Statistic Meaning
Nodes kappa stable No. of stable sampled nodes (kappa < 107)
Nodes kappa suspicius No. of suspicious sampled nodes (107 ≤ kappa < 1010)
Nodes kappa unstable No. of unstable sampled nodes (1010 ≤ kappa < 1013)
Nodes kappa ill-posed No. of ill-posed sampled nodes (1013 ≤ kappa)
Largest kappa seen The largest condition number calculated through all sampled nodes.
Kappa attention level A measure of how ill-posed the problem is (between 0 and 1).

Affects routines
ATTENTIONLEVEL, MAXKAPPA, XPRSmipoptimize ( MIPOPTIMIZE).
See also
.

Parent Topic Control Parameters

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