randomsample

matlab编写的一维扩散方程求解程序，适用于初学者学习CFD编程：显式算法，TDMA求解，分别计算平板、球、圆台的导热问题，采用了不同的边界条件 PS：自己编写的计算传热学作业(1D diffusion equation solver using MATLAB ，for fresh learner in CFD programming: Implicit, TDMA. 3 cases： plane， sphere， and yuantai heat transfering problem. In different boundary conditions. )

Calculates photonic band structure for either an fcc or diamond lattice of dielectric spheres of dielectric constant epsilon_a in a dielectric background of dielectric constant epsilon_b.(Calculates photonic band structure for ei ther'isnt an fcc or diamond lattice of dielectric v. eres of dielectric constant in a diel epsilon_a ectric background of dielectric constant epsi lon_b.)

基于观测器的仿真程序，在控制中引入等效补偿从而实现对干扰的完全抑制(Observer-based simulation program, the introduction of equivalent compensation control in order to achieve interference completely inhibited)

计算mie散射中的散射系数，an，bn，cn，dn 在研究粒子散射问题时很关键(Mie scattering in calculating the scattering coefficient, an, bn, cn, dn in the study of particle scattering problem is critical)

ks test for checking randomness property

研究表明，构成K一L变换矩阵的向量也就是ToePhtz矩阵的特征向量。与此同时，离散 余弦变换矩阵逼近于ToePutz矩阵的特征向量矩阵，所以离散余弦变换矩阵与自然图像的 K一L变换矩阵十分相似。经过离散余弦变换后的变换系数块的协方差矩阵Cy非常接近对角 阵，即除了对角线元素以外，其它很多元素都近似为0，并且在左上角集中了主要能量。这 反映了自然图像大部分区域变化不大，亮度突变只占少数，即图像能量以低频成分为主的特 性。通过变换后的量化，舍弃对视觉效果影响较小的次要信息，可达到进一步的压缩效果。 虽然从去相关性能的意义上讲，DCT是一种次于K一L变换的准最佳变换，但是从算法实现的角度来看，DCT则远远优于K一L变换。首先，当图像的分块大小确定后，DCT的变换矩阵也就随之确定了，不随输入信号的统计特性变化而变化 其次，二维DCT能够分解成两次一维DCT，有利于硬件实现。 (Studies have shown that constitute a K L transformation matrix vector is ToePhtz eigenvector of the matrix. At the same time, discrete The cosine transform matrix approximation in ToePutz matrix eigenvector matrix, so the discrete cosine transform matrix and natural images Is very similar to a K L transformation matrix. After discrete cosine transform, the transform coefficient block of Cy is very close to the diagonal of covariance matrix Matrix, namely except diagonal elements, many other elements are approximate to 0, and focused the main energy in the upper left corner. this Reflects the natural images most area changed little, brightness mutations accounted for only a few, the energy is given priority to with low frequency components of image Sex. Through quantitative after transformation, abandoning smaller effect on the visual performance of secondary information, can achieve further compression effect. Although from related to the performance of the sense, DCT is a kind o)

说明：  用MATLAB语言编程计算半波对称振子场图，电流分布和输入阻抗(Using MATLAB programming language calculated half-wave field in plane symmetric oscillator, current distribution and input impedance)

matlab 读取GLDAS提供的grib数据，提供计算实例(matlab read GLDAS provided grib data, providing examples of calculation)

这里面是信号与系统实验，比较适合于初学者，内容详细。(This experimental system, which is the signal and, more suitable for beginners and detailed.)

将signltap采集的数据导入到matlab进行，将txt文件数据导入到matlab( )