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Kernel principal component analysis (kernel PCA) is an extension of principal component analysis (PCA) using techniques of kernel methods. Using a kernel, the originally linear operations of PCA are done in a reproducing kernel Hilbert space with a non-linear mapping.

lowpass filter using rectangular window

频域内的模态参数识别方法之多参考点最小二乘复频域法，完全自己编写，希望有同样做模态参数识别的前辈给予指教与帮助(Frequency domain modal parameter identification methods as much as the reference point complex frequency domain least-squares method, completely on my own to write, want to have to do the same modal parameter identification predecessors give advice and help)

小波包法去除放电信号中的白噪声，采用db4小波分解4层(Removal of wavelet packet discharge signal white noise, using four-layer wavelet decomposition db4)

说明：  梯度下降法是一個一階最佳化算法，通常也稱為最速下降法。 要使用梯度下降法找到一個函數的局部極小值，必須向函數上當前點對應梯度（或者是近似梯度）的反方向的規定步長距離點進行疊代搜索。如果相反地向梯度正方向疊代進行搜索，則會接近函數的局部極大值點；這個過程則被稱為梯度上升法。(The gradient descent method is a first-order optimization algorithm, also commonly referred to as the steepest descent method. To find the local minimum of a function using the gradient descent method, an iterative search must be performed to the specified step distance point in the opposite direction of the gradient (or approximate gradient) of the current point on the function. If the search is reversed in the opposite direction to the positive direction of the gradient, it will approach the local maximum point of the function; this process is called the gradient ascent method.)

压缩感知中自适应匹配追踪算法SAMP,经测试可以正常使用。(Compressed sensing adaptive matching pursuit algorithm SAMP, the test can be used normally.)

This is a code that performs Ray Tracing using Snell s Law using matlab.

对应汪荣贵基于暗原色先验模型的Retinex算法程序，程序是我自己通过学习他的论文根据论文编写的，大家可以看看。(WANG Rong-gui dark colors correspond to a priori model based on Retinex algorithm, the program is my own by studying his thesis based on papers prepared, we can see.)

3D蒙特卡洛光线追迹程序。可以追迹光线在介质表面的反射、漫反射、吸收等情况。(3D Monte Carlo ray tracing program, written with the GUI. You can trace rays in the case of the reflective surface of the medium, diffuse reflection, absorption and the like.)

说明：  matlab格式源代码。功能：利用改进遗传优化算法解决BP神经网络中局部最小问题。(matlab source code format. Function: the use of improved genetic optimization algorithm BP neural network to solve local minimum problems.)