时滞微分方程数值模拟与仿真，用于种群模型、传染病模型图像拟合-The Delay Differential Numerical Modeling and Simulation for the population model, the infectious disease model image fitting

传染病模型，用于数学建模数据分析及绘图，包括SI模型、SIR模型、SIS模型图形绘制。-Epidemic model for mathematical modeling data analysis and graphics, including the SI model, SIR model, SIS model graphics rendering.