54 lines
1.4 KiB
Plaintext
54 lines
1.4 KiB
Plaintext
---
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title: ast_to_dag
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description: API reference for qiskit.converters.ast_to_dag
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in_page_toc_min_heading_level: 1
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python_api_type: function
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python_api_name: qiskit.converters.ast_to_dag
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---
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# qiskit.converters.ast\_to\_dag
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<Function id="qiskit.converters.ast_to_dag" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.18/qiskit/converters/ast_to_dag.py" signature="ast_to_dag(ast)">
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Build a `DAGCircuit` object from an AST `Node` object.
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**Parameters**
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**ast** (*Program*) – a Program Node of an AST (parser’s output)
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**Returns**
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the DAG representing an OpenQASM’s AST
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**Return type**
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[DAGCircuit](qiskit.dagcircuit.DAGCircuit "qiskit.dagcircuit.DAGCircuit")
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**Raises**
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**QiskitError** – if the AST is malformed.
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**Example**
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```python
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from qiskit.converters import ast_to_dag
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from qiskit import qasm, QuantumCircuit, ClassicalRegister, QuantumRegister
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from qiskit.visualization import dag_drawer
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%matplotlib inline
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q = QuantumRegister(3, 'q')
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c = ClassicalRegister(3, 'c')
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circ = QuantumCircuit(q, c)
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circ.h(q[0])
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circ.cx(q[0], q[1])
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circ.measure(q[0], c[0])
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circ.rz(0.5, q[1]).c_if(c, 2)
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qasm_str = circ.qasm()
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ast = qasm.Qasm(data=qasm_str).parse()
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dag = ast_to_dag(ast)
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dag_drawer(dag)
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```
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</Function>
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