XCharts/Demo/Scripts/Demo50_Scatter.cs

using System.Collections.Generic;
using UnityEngine;
using XCharts;

[DisallowMultipleComponent]
[ExecuteInEditMode]
public class Demo50_Scatter : MonoBehaviour
{
    private ScatterChart chart;

    void Awake()
    {
        chart = gameObject.GetComponent<ScatterChart>();
        if (chart == null) return;
        chart.series.SetSerieSymbolSizeCallback(SymbolSize,SymbolSelectedSize);
    }

    float SymbolSize(List<float> data)
    {
        //return Mathf.Clamp(data[1] * 10,1,100);
        return (float)(Mathf.Sqrt(data[2]) / 6e2);
    }

    float SymbolSelectedSize(List<float> data)
    {
        //return Mathf.Clamp(data[1] * 10,1,100);
        return (float)(Mathf.Sqrt(data[2]) / 5e2);
    }
}