# Clustering\_quality not defined
**URL:** https://discourse.julialang.org/t/clustering-quality-not-defined/114309
**Category:** General Usage
**Tags:** cluster
**Created:** [May 15, 2024, 4:52pm UTC](https://discourse.julialang.org/t/clustering-quality-not-defined/114309 "2024-05-15T16:52:21Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@GiuliaM](https://discourse.julialang.org/u/GiuliaM)
#### Post date: [May 15, 2024, 4:52pm UTC](https://discourse.julialang.org/t/clustering-quality-not-defined/114309/1 "2024-05-15T16:52:21Z")
Hello everyone! I’m trying to use the package Clustering.jl. The documentation reports this code to calculate different performance indices.
```julia
using Plots, Clustering
X = hcat([4., 5.] .+ 0.4 * randn(2, 10),
[9., -5.] .+ 0.4 * randn(2, 5),
[-4., -9.] .+ 1 * randn(2, 5))
nclusters = 2:5
clusterings = kmeans.(Ref(X), nclusters)
plot((
plot(nclusters,
clustering_quality.(Ref(X), clusterings, quality_index = qidx),
marker = :circle,
title = ":$qidx", label = nothing,
) for qidx in [:silhouettes, :calinski_harabasz, :xie_beni, :davies_bouldin, :dunn])...,
layout = (3, 2),
xaxis = "N clusters",
plot_title = "\"Hard\" clustering quality indices"
)
```
when I try it, this error is displayed: “clustering\_quality is not defined”. Should I add something? Thank you very much.
---
### Author:  [@RobertGregg](https://discourse.julialang.org/u/RobertGregg)
#### Post date: [May 15, 2024, 5:47pm UTC](https://discourse.julialang.org/t/clustering-quality-not-defined/114309/2 "2024-05-15T17:47:11Z")
It looks like the `clustering_quality()` function is relatively new in Clustering.jl. Maybe check that you’re using the latest version (v0.15.7) ?