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nearestSPD works on any matrix, and it is reasonably fast. As a test, randn generates a matrix that is not symmetric nor is it at all positive definite in general.

双曲线模型： 双曲线模型类似于 ，可以通过将x的倒数代换转化为线性模型来求。(Hyperbolic model )

说明：  matlab的S函数例程，是关于滑模变结构的(S function matlab routines, is about Sliding Mode Variable Structure)

一种LM算法，主要用于方程式的求解，具有较好的准确性和鲁棒性(A LM algorithm, mainly used to solve equations with good accuracy and robustness)

homomorphic filter codes are available.

数值计算机建模：Matlab建模及编程来用时域有限差分法计算光子晶体的透过率。分别使用FDTD方法及离散傅立叶变换方法求解。(Numerical computer modeling: Matlab programming to modeling and finite-difference time domain method to calculate the transmittance of photonic crystals. Respectively, using the FDTD method and the discrete Fourier transform method for solving.)

based on Newton method on load flow program that can help you better electrical system optimization

介绍回归问题中高斯过程的应用，C. E. Rasmussen & C. K. I. Williams, Gaussian Processes for Machine Learning,(Gaussian regression problem introduced in the application process, CE Rasmussen & CKI Williams, Gaussian Processes for Machine Learning,)

多个脉冲积累后可以有效地提高信噪比，中频积累时要求信号间有严格的相位关系，即信号时相参的，所以称为相参积累。(Multiple pulse accumulation can effectively improve SNR, if integration requires strict phase relationship between signals, whereby the signal coherent, so called coherent accumulation.)

说明：  作业Burg算法，用于数字信号处理中功率谱估计，简单实用。(operations Burg algorithm for digital signal processing power spectral estimation, simple and practical.)