龙格库塔法解振动方程

fft变换后求出主频，FFT transform to calculate frequency

姿态更新算法之一：方向余弦法,直接求解姿态矩阵微分方程(Attitude updating algorithm: direction cosine method, the direct matrix differential equation solving attitude)

说明：  模拟光子在多层组织中传输的蒙特卡洛仿真，包括散射系数，吸收系数，光场分布等特性(Monte Carlo simulation of photon propagation in multilayer structure ,It includes scattering coefficient, absorption coefficient,light field distribution and so on.)

说明：  相位解缠和相位展开matlab程序，里面还包含多篇介绍该相关解缠算法的文章(Phase unwrapping and phase unwrapping matlab program, which also includes more than to introduce the relevant article unwrapping algorithm)

poisson生成器，可以生成泊松分布的随机数，需要的就下载吧(poisson sasadas)

说明：  一种数值方法，用于生成样本点。样本点之间具有相关性小，分布均匀的特点。(A numerical method for generating sample points. The sample points have the characteristics of small correlation and uniform distribution.)

此代码属于地球物理领域，是用有限差分开发的直流电法三维正演，基于FORTRAN平台，此代码具有很高的运算效率，对于从事地球物理领域的人来说是不可多得的(This code belongs to the field of geophysics, is developed using finite difference method of three-dimensional forward modeling of DC, FORTRAN-based platform, this code has high computing efficiency, people engaged in geophysical field is rare)

洛斯阿拉莫斯实验室开发的显示动力有限元程序dyna3d，可处理碰撞，侵彻和接触等问题，有丰富的材料模型和状态方程，以及可扩展的二次开发能力。(source code 1 file)

用蒙特卡洛模拟的方法计算美式期权的价格以及基本描述,能量熵的计算，sar图像去噪的几种新的方法。( Monte Carlo simulation method of calculating the American option price and basic description, Energy entropy calculation, Several new methods sar image denoising.)

自定义浮点数的软件实现，支持和普通浮点数的互换。(Self-defined float compatible with IEEE 754)