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Next: GRBModel::addGenConstrExpA() Up: GRBModel::addGenConstrXxx() Previous: GRBModel::addGenConstrPoly()


GRBModel::addGenConstrExp()

Add a new general constraint of type GRB_GENCONSTR_EXP to a model.

A natural exponential function constraint states that the relationship <span>$</span>y = exp(x)<span>$</span> should hold for variables <span>$</span>x<span>$</span> and <span>$</span>y<span>$</span>.

A piecewise-linear approximation of the function is added to the model. The details of the approximation are controlled using the following four attributes (or using the parameters with the same names): FuncPieces, FuncPieceError, FuncPiecesLength, and FuncPieceRatio. For details, consult the General Constraint discussion.

GRBGenConstr addGenConstrExp ( GRBVar xvar,
    GRBVar yvar,
    std::string name="",
    std::string options="" )

Arguments:

xvar: The <span>$</span>x<span>$</span> variable.

yvar: The <span>$</span>y<span>$</span> variable.

name (optional): Name for the new general constraint.

options (optional): A string that can be used to set the attributes that control the piecewise-linear approximation of this function constraint. To assign a value to an attribute, follow the attribute name with an equal sign and the desired value (with no spaces). Assignments for different attributes should be separated by spaces (e.g. "FuncPieces=-1 FuncPieceError=0.001").

Return value:

New general constraint.


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Next: GRBModel::addGenConstrExpA() Up: GRBModel::addGenConstrXxx() Previous: GRBModel::addGenConstrPoly()