Initializing help system before first use

GetIISData(Int32, Int32, Int32, Int32[], Int32[], Char[], Char[], Double[], Double[], Char[], Char[]) Method

Returns information for an Irreducible Infeasible Set: size, variables and constraints (row and column vectors), and conflicting sides of the variables. For pure linear problems there is also information on duals, reduced costs and isolations.

Namespace:  Optimizer
Assembly: xprsdn (in xprsdn.dll) Version: 45.01.02+1f9fd7ff9a8620394fec1839699751312debed40
Syntax
C#
public void GetIISData(
	int iis,
	out int p_nrows,
	out int p_ncols,
	int[] rowind,
	int[] colind,
	char[] contype,
	char[] bndtype,
	double[] duals,
	double[] djs,
	char[] isolationrows,
	char[] isolationcols
)

Parameters

iis   Int32
The ordinal number of the IIS to get data for.
p_nrows   Int32
Pointer to an integer where the number of rows in the IIS will be returned.
p_ncols   Int32
Pointer to an integer where the number of bounds in the IIS will be returned.
rowind   Int32
Indices of rows in the IIS. Can be null if not required.
colind   Int32
Indices of bounds (columns) in the IIS. Can be null if not required.
contype   Char
Sense of rows in the IIS:
  • L: for less or equal row;
  • G: for greater or equal row.
  • E: for an equality row (for a non LP IIS);
  • 1: for a SOS1 row;
  • 2: for a SOS2 row;
  • W: for a piecewise linear constraint;
  • X: for a general constraint;
  • I: for an indicator row.
Can be null if not required.
bndtype   Char
Sense of bound in the IIS:
  • U: for upper bound;
  • L: for lower bound.
  • F: for fixed columns (for a non LP IIS);
  • B: for a binary column;
  • I: for an integer column;
  • P: for a partial integer columns;
  • S: for a semi-continuous column;
  • R: for a semi-continuous integer column.
Can be null if not required.
duals   Double
The dual multipliers associated with the rows. Can be null if not required.
djs   Double
The dual multipliers (reduced costs) associated with the bounds. Can be null if not required.
isolationrows   Char
The isolation status of the rows:
  • -1: if isolation information is not available for row (run iis isolations);
  • 0: if row is not in isolation;
  • 1: if row is in isolation.
Can be null if not required.
isolationcols   Char
The isolation status of the bounds:
  • -1: if isolation information is not available for column (run iis isolations);
  • 0: if column is not in isolation;
  • 1: if column is in isolation.
Can be null if not required.
Remarks
Examples using GetIISData:
See Also

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