---
title: ParameterVector (v1.0)
description: API reference for qiskit.circuit.ParameterVector in qiskit v1.0
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/1.0/qiskit.circuit.ParameterVector
---

# ParameterVector

*class* `qiskit.circuit.ParameterVector(name, length=0)`

[GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.0/qiskit/circuit/parametervector.py#L50-L114)

Bases: [`object`](https://docs.python.org/3/library/functions.html#object)

ParameterVector class to quickly generate lists of parameters.

## Attributes

### name

Returns the name of the ParameterVector.

### params

Returns the list of parameters in the ParameterVector.

## Methods

### index

`index(value)`

[GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.0/qiskit/circuit/parametervector.py#L74-L76)

Returns first index of value.

### resize

`resize(length)`

[GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.0/qiskit/circuit/parametervector.py#L99-L114)

Resize the parameter vector.

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.