106 lines
2.4 KiB
Plaintext
106 lines
2.4 KiB
Plaintext
---
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title: Constraint (v0.31)
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description: API reference for qiskit.optimization.problems.Constraint in qiskit v0.31
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in_page_toc_min_heading_level: 1
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python_api_type: class
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python_api_name: qiskit.optimization.problems.Constraint
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---
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# Constraint
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<Class id="qiskit.optimization.problems.Constraint" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-aqua/tree/stable/0.9/qiskit/optimization/problems/constraint.py" signature="Constraint(quadratic_program, name, sense, rhs)" modifiers="class">
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Bases: `qiskit.optimization.problems.quadratic_program_element.QuadraticProgramElement`
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Abstract Constraint Class.
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Initializes the constraint.
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**Parameters**
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* **quadratic\_program** (`Any`) – The parent QuadraticProgram.
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* **name** (`str`) – The name of the constraint.
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* **sense** (`ConstraintSense`) – The sense of the constraint.
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* **rhs** (`float`) – The right-hand-side of the constraint.
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## Methods
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<span id="qiskit-optimization-problems-constraint-evaluate" />
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### evaluate
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<Function id="qiskit.optimization.problems.Constraint.evaluate" signature="Constraint.evaluate(x)" modifiers="abstract">
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Evaluate left-hand-side of constraint for given values of variables.
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**Parameters**
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**x** (`Union`\[`ndarray`, `List`, `Dict`\[`Union`\[`int`, `str`], `float`]]) – The values to be used for the variables.
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**Return type**
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`float`
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**Returns**
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The left-hand-side of the constraint.
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</Function>
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## Attributes
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### name
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<Attribute id="qiskit.optimization.problems.Constraint.name">
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Returns the name of the constraint.
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**Return type**
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`str`
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**Returns**
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The name of the constraint.
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</Attribute>
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### quadratic\_program
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<Attribute id="qiskit.optimization.problems.Constraint.quadratic_program">
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Returns the parent QuadraticProgram.
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**Return type**
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`Any`
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**Returns**
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The parent QuadraticProgram.
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</Attribute>
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### rhs
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<Attribute id="qiskit.optimization.problems.Constraint.rhs">
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Returns the right-hand-side of the constraint.
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**Return type**
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`float`
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**Returns**
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The right-hand-side of the constraint.
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</Attribute>
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### sense
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<Attribute id="qiskit.optimization.problems.Constraint.sense">
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Returns the sense of the constraint.
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**Return type**
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`ConstraintSense`
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**Returns**
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The sense of the constraint.
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</Attribute>
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</Class>
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