problem.getbasis

Purpose

Returns the current basis into the user's data arrays.

Synopsis

problem.getbasis(rstatus, cstatus)

Arguments

rstatus

Array of length problem.attributes.rows to the basis status of the slack, surplus or artificial variable associated with each row. The status will be one of:

0	slack, surplus or artificial is non-basic at lower bound;
1	slack, surplus or artificial is basic;
2	slack or surplus is non-basic at upper bound.
3	slack or surplus is super-basic.

May be None if not required.

cstatus

Array of length problem.attributes.cols to hold the basis status of the columns in the constraint matrix. The status will be one of:

0	variable is non-basic at lower bound, or superbasic at zero if the variable has no lower bound;
1	variable is basic;
2	variable is non-basic at upper bound;
3	variable is super-basic.

May be None if not required.

Example

The following example minimizes a problem before saving the basis for later:

rstatus = []
cstatus = []
p.lpoptimize()
p.getbasis(rstatus, cstatus)

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problem.getbasis

problem.getbasis