62 lines
2.9 KiB
Plaintext
62 lines
2.9 KiB
Plaintext
---
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title: ParameterVector
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description: API reference for qiskit.circuit.ParameterVector
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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.circuit.ParameterVector
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---
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# qiskit.circuit.ParameterVector
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<Class id="qiskit.circuit.ParameterVector" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.17/qiskit/circuit/parametervector.py" signature="ParameterVector(name, length=0)" modifiers="class">
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ParameterVector class to quickly generate lists of parameters.
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### \_\_init\_\_
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<Function id="qiskit.circuit.ParameterVector.__init__" signature="__init__(name, length=0)">
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Initialize self. See help(type(self)) for accurate signature.
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</Function>
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## Methods
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| | |
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| ----------------------------------------------------------------------------------------------------------------- | ----------------------------- |
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| [`__init__`](#qiskit.circuit.ParameterVector.__init__ "qiskit.circuit.ParameterVector.__init__")(name\[, length]) | Initialize self. |
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| [`index`](#qiskit.circuit.ParameterVector.index "qiskit.circuit.ParameterVector.index")(value) | Returns first index of value. |
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| [`resize`](#qiskit.circuit.ParameterVector.resize "qiskit.circuit.ParameterVector.resize")(length) | Resize the parameter vector. |
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## Attributes
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| ------------------------------------------------------------------------------------------ | ------------------------------------------------------ |
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| [`name`](#qiskit.circuit.ParameterVector.name "qiskit.circuit.ParameterVector.name") | Returns the name of the ParameterVector. |
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| [`params`](#qiskit.circuit.ParameterVector.params "qiskit.circuit.ParameterVector.params") | Returns the list of parameters in the ParameterVector. |
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### index
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<Function id="qiskit.circuit.ParameterVector.index" signature="index(value)">
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Returns first index of value.
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</Function>
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### name
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<Attribute id="qiskit.circuit.ParameterVector.name">
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Returns the name of the ParameterVector.
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</Attribute>
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### params
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<Attribute id="qiskit.circuit.ParameterVector.params">
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Returns the list of parameters in the ParameterVector.
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</Attribute>
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### resize
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<Function id="qiskit.circuit.ParameterVector.resize" signature="resize(length)">
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Resize the parameter vector.
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If necessary, new elements are generated. If length is smaller than before, the previous elements are cached and not re-generated if the vector is enlarged again. This is to ensure that the parameter instances do not change.
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</Function>
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</Class>
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