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MATLAB
一、 牛顿－拉夫逊法概要
首先对一般的牛顿－拉夫逊法作一简单说明。已知一个变量X的函数
（4－6）
解此方程式时，由适当的近似值X（0）出发，根据 （4－7）
反复进行计算，当X（n）满足适当的收敛判定条件时就是（4－6）式的根。这样的方法就是所谓的牛顿－拉夫逊法。
式（4－7）就是取第n次近似解X（n）在曲线 上的点 处的切线与X轴的交点作下一次X（n+1）值的方法。参考图4－2（a）。在这一方法中为了能收敛于真解，初值X（0）的选取及函数f（X）必须满足适当的条件，如图4－2（b）所示的那种情况就不能收敛或收敛到别的根上去。
这一方法还可以做下面的解释，设第n次迭代得到的解与真值之差，即 的误差为 时，则
（4-8）
把 在 附近对 用泰勒级数展开
（4-9）
上式略去 以下的项
（4-10）
的误差可近似由上式计算出来
图4-2
（4-11）
比较式（4-7）和（4-11），可以看出牛顿-拉夫逊法的修正量和 的误差的一次项相等。
用同样的方法考虑，给出对n个变量 (:Because of the importance and complexity of power system, better algorithm and programme language
is very important . An interior point method based on the perturbed Karush2Kuhn2Tucker (KKT) condition is pre2
sented in this paper , where the method and process for the optimal power flow is treated through the Matlab’s
symbolic math toolbox and Mfunction is also presented. Using the symbolic code , it can improve the adaptability
of the programme dramatically. The advantage is that , what we need to do is change the model expression. We
can make use of the symbolic programme to check our programme while we write the Mfunctions. Using the Mat2
lab , we find the optimal solutions and calculate quickly and efficiently. It has proposed the powerful and unique
functions of Matlab in the optimization and calculation for power system.
Key words :power system symbolic calculation optimal power flow interior point method)
- 2020-07-08 16:38:56下载
- 积分：1
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yuv
matlab读取YUV文件，有需要的可以看看 (Matlab read YUV video, detailed and comprehensive, there is a need to have a look)
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complex-network
建立复杂网络中四个基本网络模型，以及求各种基本属性(struct models for the four basic complex networks and tell us how to resolve the basic proprties)
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FFTcircle
应用FFT方法计算时间序列平均周期的源码。不是很复杂，不过效果比较好。可供参考(Application of FFT calculated the average cycle time of the source sequence. Not very complicated, but the effect is better. For reference)
- 2009-04-22 10:33:59下载
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matlab_image_bloodcell_test
血红细胞边缘的精确检测的MATLAB实现，实现阈值分割，噪声干扰，腐蚀，边缘检测(The edge of the red blood cells to achieve accurate detection of MATLAB to achieve segmentation, noise, corrosion, edge detection)
- 2010-05-20 15:38:35下载
- 积分：1
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lda-0.2-matlab
matlab判别分析，基本思想是将高维的模式样本投影到最佳鉴别矢量空间，以达到抽取分类信息和压缩特征空间维数的效果，投影后保证模式样本在新的子空间有最大的类间距离和最小的类内距离，即模式在该空间中有最佳的可分离性。(matlab discriminant analysis, the basic idea is to sample the high-dimensional pattern projected onto the optimal discriminant vector space, in order to achieve the classification of information extraction and compression feature space dimension effect, the projected sample assurance model in the new subspace has the largest class room the intra-class distance and the minimum distance, i.e., have the best separability pattern in the space.)
- 2015-04-21 16:26:15下载
- 积分：1
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data
说明： 概率神经网络的分类预测-基于PNN变压器故障诊断(Classification and Prediction of Probabilistic Neural Networks-Based on PNN Transformer Fault Diagnosis)
- 2019-04-01 10:22:20下载
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zjmohupid1233
建立了风电场模型，并采用模糊前馈的方法进行功率控制(Fan control model, the simulation results)
- 2014-10-14 16:05:39下载
- 积分：1
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WriteImageJROI
把MATLAB中感兴趣区域导出成ImageJ能读入的数据(MATLAB exported in the region of interest to be able to read data ImageJ)
- 2014-08-29 15:59:16下载
- 积分：1
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Power-Spectral--Density-of-a-time-serie
power spectral density
- 2014-09-16 04:51:44下载
- 积分：1
