PivotPythonBase

This class defines an interface all the Python pivot rules must implement. It consists of a method pivotColumn() which must be implemented and isPivotAcceptable() whose implementation is optional.

class cylp.py.pivots.PivotPythonBase.PivotPythonBase

isPivotAcceptable()

This is run just before the actual pivoting happens. Return False if the pivot is not acceptable for your method.

pivotColumn()

Every subclass of PivotPythonBase, i.e. every pivot rule, must implement this method.

Return the index of the entering variable, an integer.

updateReducedCosts(updates, spareRow1, spareRow2, spareCol1, spareCol2)

Update the reduced costs as its done in CLP’s Dantzig rule.