Procedure MatrixModifyCoefficient(MP, row, column, value)

MatrixModifyCoefficient

The procedure MatrixModifyCoefficient changes a coefficient in the matrix. This procedure can also be used to modify a coefficient in the objective row. The value for the coefficient can be equal to 0.0 prior to calling this procedure.

MatrixModifyCoefficient(
     MP,             ! (input) a mathematical program
     row,            ! (input) a scalar value
     column,         ! (input) a scalar value
     value           ! (input) a numerical expression
     )

Arguments

MP

A mathematical program that was previously solved. The mathematical program should be a linear or mixed-integer linear programming model.

row

A scalar reference to an existing row in the matrix; this might be the objective row.

column

A scalar reference to an existing column in the matrix.

value

The new value that should be assigned to the coefficient corresponding to row and column in the matrix. This value should be unequal to NA, INF, -INF and UNDF.

Return Value

The procedure returns 1 on success, and 0 otherwise.

Note

As of AIMMS release 3.5, the matrix manipulation procedures have become deprecated. New projects should use the GMP library instead. Please refer to Table 5 for a mapping of the matrix manipulation procedures to corresponding GMP procedures.

See also

Matrix manipulation routines are discussed in more detail in Implementing Advanced Algorithms for Mathematical Programs of the Language Reference.