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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: 45.01.02+1f9fd7ff9a8620394fec1839699751312debed40
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   Int32
Number of bound changes to try.
colind   Int32
Integer array of size nbounds containing the indices of the columns on which the bounds will change.
bndtype   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   Double
Double array of length nbounds giving the new bound values.
iterlim   Int32
Maximum number of LP iterations to perform for each bound change.
objval   Double
Objective value of each LP after performing the strong branching iterations.
status   Int32
Status of each LP after performing the strong branching iterations, as detailed for the LPSTATUS attribute.
callback   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   Object
User context to be provided for callback.
See Also
Parent Topic XPRSprob Methods

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