QuadraticProgram.substitute_variables

QuadraticProgram.substitute_variables(constants=None, variables=None)[source]

Substitutes variables with constants or other variables.

Parameters

  • constants (Optional[Dict[Union[int, str], float]]) – replace variable by constant e.g., {‘x’: 2} means ‘x’ is substituted with 2

  • variables (Optional[Dict[Union[str, int], Tuple[Union[str, int], float]]]) – replace variables by weighted other variable need to copy everything using name reference to make sure that indices are matched correctly. The lower and upper bounds are updated accordingly. e.g., {‘x’: (‘y’, 2)} means ‘x’ is substituted with ‘y’ * 2

Return type

QuadraticProgram

Returns

An optimization problem by substituting variables with constants or other variables. If the substitution is valid, QuadraticProgram.status is still QuadraticProgram.Status.VALIAD. Otherwise, it gets QuadraticProgram.Status.INFEASIBLE.

Raises

QiskitOptimizationError – if the substitution is invalid as follows. - Same variable is substituted multiple times. - Coefficient of variable substitution is zero.