Function GMP::Instance::GetColumnNumbers(GMP, variableSet)

GMP::Instance::GetColumnNumbers

The function GMP::Instance::GetColumnNumbers returns a subset of the column numbers of a generated mathematical program. It returns the column numbers that are generated for a set of variables.

GMP::Instance::GetColumnNumbers(
     GMP,                ! (input) a generated mathematical program
     variableSet         ! (input) a set of variables
     )

Arguments

GMP

An element in the set AllGeneratedMathematicalPrograms.

variableSet

A subset of the set AllVariables.

Return Value

The function returns a subset of the column numbers as a subset of the set Integers.

Example

Assume we have generated a mathematical program and we want to change the upper bound of the variables demand(i) and supply(j,k) into 100. This can be done as follows:

myGMP := GMP::Instance::Generated( MP );

for (i) do
    GMP::Column::SetUpperBound( myGMP, demand(i), 100 );
endfor;

for (j,k) do
    GMP::Column::SetUpperBound( myGMP, supply(j,k), 100 );
endfor;

Using the function GMP::Instance::GetColumnNumbers this can also be coded as follows. Here ColNrs is a subset of Integers with index c, and Vars a subset of AllVariables.

myGMP := GMP::Instance::Generated( MP );

Vars := { 'demand', 'supply' };

ColNrs := GMP::Instance::GetColumnNumbers( myGMP, Vars );

for (c) do
    GMP::Column::SetUpperBound( myGMP, c, 100 );
endfor;

See also

The functions GMP::Instance::Generate, GMP::Instance::GetNumberOfColumns, GMP::Instance::GetRowNumbers, GMP::Instance::GetObjectiveColumnNumber and GMP::Instance::GetObjectiveRowNumber.