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numerical_analysis_homework
(有源代码)数值分析作业,本文主要包括两个部分,第一部分是常微分方程(ODE)的三个实验题,第二部分是有关的拓展讨论,包括高阶常微分的求解和边值问题的求解(BVP).文中的算法和算例都是基于Matlab计算的.ODE问题从刚性(STIFFNESS)来看分为非刚性的问题和刚性的问题,刚性问题(如大系数的VDP方程)用通常的方法如ODE45来求解,效率会很低,用ODE15S等,则效率会高多了.而通常的非刚性问题,用ODE45来求解会有很好的效果.从阶次来看可以分为高阶微分方程和一阶常微分方程,高阶的微分方程一般可以化为状态空间(STATE SPACE)的低阶微分方程来求解.从微分方程的性态看来,主要是微分方程式一阶导系数大的时候,步长应该选得响应的小些.或者如果问题的性态不是太好估计的话,用较小的步长是比较好的,此外的话Adams多步法在小步长的时候效率比R-K(RUNGE-KUTTA)方法要好些,而精度也高些,但是稳定区间要小些.从初值和边值来看,也是显著的不同的.此外对于非线性常微分方程还有打靶法,胞映射方法等.而对于微分方程稳定性的研究,则诸如相平面图等也是不可缺少的工具.值得提出的是,除了用ode系类函数外,用simulink等等模块图来求解微分方程也是一种非常不错的方法,甚至是更有优势的方法(在应用的角度来说).((Source code) numerical analysis homework, this docment includes two parts, the first is ordinary differential equations (ODE) of the three examples, the second part is about the expansion of the discussion, including the higher-order ordinary differential & boundary value solution Problems (BVP). the text of the algorithm and numerical examples are based on the Matlab. ODE from the rigid (STIFFNESS) look into the issue of non-rigid and rigid problem, rigid problems (such as large coefficient VDP equation) such as using the always method ODE45 used to solve the problems , efficiency will be low, with ODE15S the other hand, many of the high efficiency. and the usual problem of non-rigid, there will be used to solve ODE45 very good results. Judging from the order can be for high-order differential equations and first-order ordinary differential equations, higher-order differential equations can be transformed into a general state space (STATE SPACE) used to solve the low-order different)
- 2009-03-16 09:06:09下载
- 积分：1
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matlab-code-of-facerecognize
这是一个人脸识别的matlab例程，可以运行(here is an example of facerecognize)
- 2012-03-23 21:37:44下载
- 积分：1
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data_processing
故障时频域特征提取，前六阶CEEMDAN+初始信号时频域特征(Fault time-frequency domain feature extraction, first six-order CEEMDAN + initial signal time-frequency domain feature)
- 2020-06-24 07:20:02下载
- 积分：1
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Matlabalgo
Matlab经典算法优化问题
Matlab经典算法优化问题(Matlab classical algorithm optimization Matlab classical algorithm optimization problem)
- 2007-06-18 23:36:52下载
- 积分：1
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head1
基于视频序列的粒子滤波跟踪程序，首先选中目标图片，有仿真结果(target tracking based on particle filtering)
- 2012-05-29 22:15:03下载
- 积分：1
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PM
说明： 利用传播算子，进行阵列信号角度估计，运算快，不需要峰值搜索。(Use propagator conduct array signal angle estimation, fast operation, no peak search.)
- 2015-03-21 12:34:47下载
- 积分：1
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Desktop
signal system
show BODE PLOT and step response of transfer function
EFFECT OF c2d command in matlab for continuous system
- 2013-05-19 22:43:22下载
- 积分：1
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chuixiangqiudao
该程序能够对得到的重力场数据进行垂向求导，对于重力数据处理很有用。(The program can be on the gravity field data were obtained for the vertical derivative of gravity data processing, very useful.)
- 2014-03-15 22:55:22下载
- 积分：1
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rezufahuanreshebei
对多功能动态试验装置的污垢厚度的检测，可以得到污垢形成的规律，从而有效地抑制污垢的形成。换热设备作为火电厂的重要设备之一，污垢的存在使传热能力下降，造成不必要的经济损失，通过对污垢的检测，掌握了热学法检测污垢的方法，提高换热设备的传热能力。(Dynamic tests on the multi-function devices detect the thickness of the dirt, the dirt can be formed by law, to effectively inhibit the formation of dirt. Heat exchanger equipment as one of the important thermal power plant, the presence of dirt reduced capacity to heat, causing unnecessary economic losses, through the dirt of detection, control the fouling thermal detection methods to improve heat transfer equipment heat capacity.)
- 2010-09-06 18:44:28下载
- 积分：1
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linear_programming
4 methods of linear programming
simplex
revised simplex
revised simplex lu
prime dual interior point
- 2009-11-24 16:27:20下载
- 积分：1
