commands-for-data-fitting

有限差分法 微分方程和积分微分方程数值解的方法。基本思想是把连续的定解区域用有限个离散点构成的网格来代替， 这些离散点称作网格的节点；把连续定解区域上的连续变量的函数用在网格上定义的离散变量函数来近似；把原方程和定解条件中的微商用差商来近似， 积分用积分和来近似，于是原微分方程和定解条件就近似地代之以代数方程组，即有限差分方程组 ， 解此方程组就可以得到原问题在离散点上的近似解。然后再利用插值方法便可以从离散解得到定解问题在整个区域上的近似解。 (Finite Difference Method Numerical solution of differential equations and integro-differential equation approach. The basic idea is to set a continuous solution of the region with a finite number of discrete points instead of a grid consisting of, these discrete points called grid nodes the solution of a continuous area on a given function of continuous variables used in the definition of discrete grid variable function approximation the original equation and boundary conditions in the micro-business operators to approximate differential, integral with the points and to approximate, so the original differential equations and boundary conditions are replaced by algebraic equations near Side, that is, finite difference equations , solve this equation group can get the original problem in discrete points on the approximate solution. And then using interpolation methods can be determined from the discrete solution of the problem solution of the approximate solution on the entire region)

推导运动学中杆运动模型的例程，对初学者有一定的价值。(Kinematic motion model is derived in the bar routines, for beginners a certain value.)

一个最速下降法源码，很有用，需要的赶快下。(a steepest descent algorithm source code, useful, it needs quickly under.)

这是一个基于光信道（考虑色散）的OOK调制，其中看空比为63 (This is a OOK modulation based optical channel (taking into account dispersion), which bearish on the ratio of 63 )

This submission includes the presentation and model files that were used in delivering a webinar on 12-15-05 that covered the topic of modeling Hybrid Electric Vehicles. Hybrid electric vehicles (HEVs) have proven they can substantially improve fuel economy and reduce emissions. Because HEVs combine an electric drive with the internal combustion engine (ICE) in the powertrain, the vehicle?s kinetic energy can be captured during braking and transformed into electrical energy in the battery. The dual power source also means that the ICE can be reduced in size and can operate at its most efficient speeds.

matlab的使用方法，初学则可以快速入门(the use of matlab, you can Quick Start)

线性调频（LFM）脉冲压缩雷达仿真,线性调频脉冲压缩的Matlab程序，Word说明，运行结果(linear FM (LFM) radar pulse compression simulation, LFM Matlab pulse compression procedures, Word stated that operating results)

对pmu配置的一群算法，绝对简单好用，对遗传算法的一种改进(Pmu configuration of a group of algorithms, absolutely easy to use, an improved genetic algorithm)

matlab使用共轭梯度法求解laplace方程(matlab program using CG method solving laplace eq.)

开关磁阻电机斩波控制的simulink模型(current chopping control for switched reluctance drive)