Pattern_recognition1

地球物理反问题中带约束的Tikhonov正则化方法的应用(applications of constrained regularization method )

用于计算谱相关函数的时域平花FFT积累算法，可改参数，改输入信号类型(calculate spectral correlation function by using time smoothing FFT Accumulation Algorithm, you can change the parameters, and the type of input signal )

说明：  邓肯张在ansys中的二次开发，适合于土体有限元分析(second development of duncan-zhang in ansys,it s be used to ansys)

converts a binary undirected adjacency graph into a hypergraph. The output is a non symmetric matrix where the columns are the vertices and the rows are the hyper edges.

the structure of the DG-FEM is very similar to that of the finite element method (FEM), there are several fundamental differences. In particular, the mass matrix is local rather than global and thus can be inverted at very little cost, yielding a semidiscrete scheme that is explicit. Furthermore, by carefully designing the numerical flux to reflect the underlying dynamics, one has more flexibility than in the classic FEM to ensure stability for wavedominated problems. Compared with the FVM, the DG-FEM overcomes the key limitation on achieving high-order accuracy on general grids by enabling this through the local element-based basis

test1.txt 第一列为时间t，0.001s为步长；第二列为系统的输入信号；第三列为系统的输出信号。 signal_analyzer.m首先将test1.txt 的数据读入workspace，然后进行FFT，分析出两信号的频率，输出对于输入的幅值衰减（db），输出对输入的相位差。(test1.txt the first time as t, 0.001s for the step the second as the system input signal the third as the system output signal. signal_analyzer.m first test1.txt data read workspace, and then proceed to FFT, analysis of the two signals in the frequency, the output for input amplitude attenuation (db), the output of the input phase difference.)

说明：  用LINGO求解最短路径问题，此方法为0-1规划，只适用于简单的ILP问题。(Lingo is used to solve the shortest path problem, which is a 0-1 programming method. It is only suitable for simple ILP problems.)

此程序为潮流计算的最后一部分功率计算程序。(This program is the last part of the power flow calculation calculation program.)

目前为止最快速的EMD算法，也可作为SIFT匹配的一种方法(So far, the fastest EMD algorithm can also be used as a method of SIFT matching)

有限差分模拟，实现通量校正传输,用于地震正演模拟(For finite difference simulation, to flux calibration transfer function)