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StrongBranchCB Method

Performs strong branching iterations on all specified bound changes. For each candidate bound change, strongBranchCB performs dual simplex iterations starting from the current optimal solution of the base LP, and returns both the status and objective value reached after these iterations.

Namespace:   Optimizer
Assembly:  xprsdn (in xprsdn.dll) Version: 44.01.04
Syntax
C# 
public void StrongBranchCB(
	int nbounds,
	int[] colind,
	char[] bndtype,
	double[] bndval,
	int iterlim,
	double[] objval,
	int[] status,
	StrongBranchSolveCallback callback,
	Object data
)

Parameters

nbounds
Type:  System.Int32
Number of bound changes to try.
colind
Type:  System.Int32
Integer array of size nbounds containing the indices of the columns on which the bounds will change.
bndtype
Type:  System.Char
Character array of length nbounds indicating the type of bound to change:
  • U: indicates change the upper bound;
  • L: indicates change the lower bound;
  • B: indicates change both bounds, i.e. fix the column.
bndval
Type:  System.Double
Double array of length nbounds giving the new bound values.
iterlim
Type:  System.Int32
Maximum number of LP iterations to perform for each bound change.
objval
Type:  System.Double
Objective value of each LP after performing the strong branching iterations.
status
Type:  System.Int32
Status of each LP after performing the strong branching iterations, as detailed for the LPSTATUS attribute.
callback
Type:  Optimizer.StrongBranchSolveCallback
Function to be called after each strong branch has been reoptimized. This function returns an integer. Use 0 to indicate that everything went fine. Use a return value different from 0 to signal an error. This will terminate the function.
data
Type:  System.Object
User context to be provided for callback.
Remarks
See Also
Parent Topic XPRSprob Methods

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