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

public void PresolveRow(
	char rowtype,
	int norigcoefs,
	int[] origcolind,
	double[] origrowcoef,
	double origrhs,
	int maxcoefs,
	out int p_ncoefs,
	int[] colind,
	double[] rowcoef,
	out double p_rhs,
	out int p_status
)

Parameters

rowtype   Char

The type of the row:

• L: indicates a <= row;
• G: indicates a >= row.
• E: indicates a >= row.

norigcoefs   Int32

Number of elements in the origcolind and origrowcoef arrays.

origcolind   Int32

Integer array of length norigcoefs containing the column indices of the row to presolve.

origrowcoef   Double

Double array of length norigcoefs containing the non-zero coefficients of the row to presolve.

origrhs   Double

The right-hand side constant of the row to presolve.

maxcoefs   Int32

Maximum number of elements to return in the colind and rowcoef arrays. The function will not write more elements than this to colind or rowcoef, even if the presolved row is longer.

p_ncoefs   Int32

Pointer to the integer where the number of non-zero elements in the presolved row will be returned (this may be bigger than maxcoefs).

colind   Int32

Integer array of length maxcoefs which will be filled with the column indices of the presolved row. May be null if not required. Allocate this to COLS elements and pass COLS as maxcoef> to make sure it is large enough to hold the presolved row.

rowcoef   Double

Double array of length maxcoefs which will be filled with the coefficients of the presolved row. May be null if not required. Allocate this to COLS elements and pass COLS as maxcoef> to make sure it is large enough to hold the presolved row.

p_rhs   Double

Pointer to the double where the presolved right-hand side will be returned.

p_status   Int32

Status of the presolved row:

• -5: Failed to presolve the row due to presolve operations making the row nonlinear;
• -4: Failed to presolve the equality row due to presolve operations requiring relaxation of the row;
• -3: Failed to presolve the row due to presolve dual reductions;
• -2: Failed to presolve the row due to presolve duplicate column reductions;
• -1: Failed to presolve the row due to an error. Check the Optimizer error code for the cause;
• 0: The row was successfully presolved;
• 1: The row was presolved, but may be relaxed.

May be null if not required.

• TSP.cs

Reference