LinearExpression

class LinearExpression(quadratic_program, coefficients)

Bases: qiskit.optimization.problems.quadratic_program_element.QuadraticProgramElement

Representation of a linear expression by its coefficients.

Creates a new linear expression.

The linear expression can be defined via an array, a list, a sparse matrix, or a dictionary that uses variable names or indices as keys and stores the values internally as a dok_matrix.

Parameters

• quadratic_program (Any) – The parent QuadraticProgram.

• coefficients (Union[ndarray, spmatrix, List[float], Dict[Union[int, str], float]]) – The (sparse) representation of the coefficients.

Methods

evaluate	Evaluate the linear expression for given variables.
evaluate_gradient	Evaluate the gradient of the linear expression for given variables.
to_array	Returns the coefficients of the linear expression as array.
to_dict	Returns the coefficients of the linear expression as dictionary, either using variable names or indices as keys.

Attributes

coefficients

Returns the coefficients of the linear expression.

Return type

dok_matrix

Returns

The coefficients of the linear expression.

quadratic_program

Returns the parent QuadraticProgram.

Return type

Any

Returns

The parent QuadraticProgram.