EVF

The MATLAB package accompanying this manuscript is organized into two main directories:

Main Code
Contains the primary MATLAB scripts used to implement the Entropy Variability Factor (EVF) framework, including rolling Shannon entropy computation, EVF and SEVF calculation, Entropy Variability Index (EVI) classification, statistical testing, visualization generation, and real-world case-study analysis.
Sensitivity Analysis
Contains supplementary MATLAB scripts used to evaluate the robustness of the EVF framework with respect to rolling-window length, histogram-bin selection, null-zone calibration, and EVI threshold stability.

The Main Code directory is further divided into the following subfolders:

• Sinusoidal Time Series
Includes synthetic benchmark simulations used to demonstrate the monotonic response of rolling Shannon entropy to progressively increasing disorder levels.

• Null Zone Calibration
Contains Monte Carlo simulations used to characterize EVF behavior under stable conditions and to empirically derive the ±2% EVF null zone.

• EVI Thresholds
Includes Monte Carlo analyses used to establish empirical EVI severity thresholds corresponding to negligible, small, moderate, and large structural variability changes.

• Texas Case Study
Contains scripts used for the February 2021 Texas power crisis analysis, including entropy computation, EVF/EVI generation, and comparison against the February 2020 baseline.

• California Case Study
Contains scripts used for the August 2020 California heatwave analysis, including regional temperature screening, CAISO load analysis, and EVF-based variability assessment relative to August 2019.

All MATLAB scripts were developed and tested using MATLAB R2024a. The code is organized to allow reproducibility of all figures, tables, and analyses presented in the manuscript.

本论文配套的MATLAB工具包分为两个主要目录：
主代码目录（Main Code）
包含用于实现熵变异性因子（Entropy Variability Factor, EVF）框架的核心MATLAB脚本，涵盖滚动香农熵计算、EVF与SEVF计算、熵变异性指数（Entropy Variability Index, EVI）分类、统计检验、可视化生成以及实际案例分析。
敏感性分析目录（Sensitivity Analysis）
包含用于评估EVF框架鲁棒性的补充MATLAB脚本，测试维度涵盖滚动窗口长度、直方图分箱选择、零区校准以及EVI阈值稳定性。

主代码目录（Main Code）进一步划分为以下子文件夹：
• 正弦时间序列子文件夹（Sinusoidal Time Series）：包含合成基准仿真脚本，用于展示滚动香农熵随无序程度递增的单调响应特性。
• 零区校准子文件夹（Null Zone Calibration）：包含蒙特卡洛仿真脚本，用于表征稳定条件下EVF的行为特征，并经验推导得到±2%的EVF零区。
• EVI阈值子文件夹（EVI Thresholds）：包含蒙特卡洛分析脚本，用于建立对应可忽略、轻微、中等及显著结构变异性变化的经验EVI严重程度阈值。
• 得克萨斯州案例研究子文件夹（Texas Case Study）：包含用于2021年2月得克萨斯州电力危机分析的脚本，涵盖熵计算、EVF/EVI生成以及与2020年2月基准的对比分析。
• 加利福尼亚州案例研究子文件夹（California Case Study）：包含用于2020年8月加利福尼亚州热浪分析的脚本，涵盖区域温度筛查、CAISO负荷分析以及基于EVF的变异性评估（以2019年8月为基准）。

所有MATLAB脚本均基于MATLAB R2024a版本开发并完成测试。本代码的组织结构可完整复现论文中呈现的全部图表、表格及分析结果。