coordinate_conversion

基于牛顿插值方法，由位置微分得到速度。给出卷积系数(Newton interpolation method by position differential speed. Given convolution coefficients)

This is used to draw the magnetic field strength of coil square program.(This is used to draw the magnetic field strength of coil square program)

说明：  通过对速度矢量计算 模拟飞机飞行 利用m语言编写(Fly a 747: Problem Definition)

说明：  用级数PI/4 = 1 -1/3 + 1/5 -1/7+…求PI的近似值，要求取前1000项来计算。(With a series PI/4 = 1-1/3+ 1/5-1/7+ ... seeking an approximation of PI, demanded before the 1000 data.)

電磁波,天線設計與分析工具箱,包含大量範例(Electromagnetic waves, antenna design and analysis toolbox, including a large number of examples)

此程序用于实现结构的有限元计算：将patran中的模型的bdf文件中的单元信息和节点信息保存成txt文档，在matlab中调用，就可实现刚度矩阵、质量矩阵的组装，进而有限元计算(This procedure is used to achieve the structure of the finite element method: bdf file of the model in patran unit information and node information is saved into a txt file called in matlab, you can achieve the stiffness matrix, mass matrix assembly, and then the finite elementcalculate)

DCT and Image Compression In the JPEG image compression algorithm, the input image is divided into 8-by-8 or 16-by-16 blocks, and the two-dimensional DCT is computed for each block. The DCT coefficients are then quantized, coded, and transmitted. The JPEG receiver (or JPEG file reader) decodes the quantized DCT coefficients, computes the inverse two-dimensional DCT of each block, and then puts the blocks back together into a single image. For typical images, many of the DCT coefficients have values close to zero these coefficients can be discarded without seriously affecting the quality of the reconstructed image. The example code below computes the two-dimensional DCT of 8-by-8 blocks in the input image, discards (sets to zero) all but 10 of the 64 DCT coefficients in each block, and then reconstructs the image using the two-dimensional inverse DCT of each block. The transform matrix computation method is used.

说明：  用于求循环普相关函数，可用于轴承，齿轮等旋转机械故障诊断(Cyclic spectral correlation)

说明：  chirp信号匹配压缩仿真 以及信号分析，相关参数的计算(Simulation of chirp signal matching compression)

DG Placement optimization in 33-bus and 69-bus distribution power systems using Imperialistic Competition optimization algorithm.