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This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. (This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. )

MATLAB的中文帮助文档,适合MATLAB的初学者，以及不涉及MATLAB复杂功能的学生(matlab s chinese help document)

this function returns the SIFT descriptors DESCR of the SIFT frames P defined on the octave G of the Gaussian scale space.

计算LYAPUNOV指数 计算LYAPUNOV指数 计算LYAPUNOV指数(LYAPUNOV index calculated LYAPUNOV Index Index LYAPUNOV)

说明：  傅里叶变换的全相位分析，适合初学者参考，用时将后缀改成.7z(Full phase analysis of Fourier transform, suitable for beginners)

说明：  matlab振动试验数据分析，信号获取：测量获取设备的信号（振动、转速、过程参等）。信号分析：从信号中提取反映设备运行状态和故障的特征值。故障诊断：根据信号特征信息，对故障进行诊断（专家诊断、智能自动诊断）和预测(Matlab vibration test data analysis, signal acquisition: Measurement and acquisition of equipment signals (vibration, speed, process parameters, etc.). Signal analysis: extract the characteristic value of equipment running state and fault from the signal. Fault diagnosis: fault diagnosis (expert diagnosis, intelligent automatic diagnosis) and prediction according to signal characteristic information)

Maximum Length PN sequences are binary sequence generators that are capable of outputting all possible combinations of binary sequences in 2^m-1 cyclic shifts, where m is the size of the LFSR (Linear Feedback Shift Registers ) used in generating such sequences. Terms like Psuedorandom binary sequences (PRBS) or psuedonoise sequences are also used to refer m-sequences.

韶山电力机车三段桥在电感情况下波形三段桥仿真波形，电动机等效为电感，反电动势(Shaoshan electric locomotive segment bridge waveform in the inductive case of the three sections of the bridge simulation waveform, the motor equivalent inductance, back electromotive force)

MATLAB仿真技术与实例应用教程，其中有很多仿真实验，对于初学者尽快熟悉matlab的使用是很有用的！(MATLAB simulation technology and examples of application tutorials, of which there are many simulation matlab use is useful for beginners to familiarize themselves!)

绘制控制系统近似bode图，为了做自动控制原理作业时偷点懒。虽然matlab自带bode函数但是作业要求画近似的。(Drawing control system approximation bode diagram, when you steal lazy to do the job of Automatic Control Theory. Although matlab function but the job comes bode asked to draw approximate.)