addGenConstrAbs ( resvar, argvar, name="" )

Add a new general constraint of type GRB.GENCONSTR_ABS to a model.

An ABS constraint $r = \mbox{abs}\{x\}$ states that the resultant variable $r$ should be equal to the absolute value of the argument variable $x$.

You can also add an ABS constraint using the abs_ function.


resvar (Var): The variable whose value will be to equal the absolute value of the argument variable.

argvar (Var): The variable for which the absolute value will be taken.

name (string, optional): Name for the new general constraint. Note that name will be stored as an ASCII string. Thus, a name like 'A${\rightarrow}$B' will produce an error, because '${\rightarrow}$' can not be represented as an ASCII character. Note also that names that contain spaces are strongly discouraged, because they can't be written to LP format files.

Example usage:

  # x5 = abs(x1)
  model.addGenConstrAbs(x5, x1, "absconstr")

  # overloaded form
  model.addConstr(x5 == abs_(x1), name="absconstr")