复化三点Gauss-lengend公式求pi，鲁棒性好，性能优越，包括回归分析和概率统计，IMC-PID是利用内模控制原理来对PID参数进行计算，插值与拟合，解方程，数据分析，有小波分析的盲信号处理。- Complex of three-point Gauss-lengend the Formula pi, Robustness, superior performance, Including regression analysis and probability and statistics,