割线法用来求根，很好用的一个求解程序，数值方法-Secant method used for the root, a useful solution program, the numerical method

原理：通过牛顿割线计算隐含分布率。 应用：计算facebook在欧洲的看涨期权和看跌期权。- C++ program to calculate the implied volatility using Newton-Ralphson (secant) * method for European Call and put Options for face book.

自己编的闻邦椿书上的Riccati求转子临界转速，转子为单跨双转盘。有去除奇点，提取振型，收敛迭代为弦截法。有各向异性求取临界转速部分，不过结果可能不准确。-Riccati Wen Bangchun own series of books on demand critical speed rotor, the rotor is a single span double turntable. There are singular point removal, extraction modes, t