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Return matrix of all possible k indexes, it is C(n,k) variants

novel topology of Double-Frequency buck converter.

digital image filter

自适应滤波lms算法，采用ask调制，三条多经信道，信噪比可调。(LMS adaptive filtering algorithm, using ask modulation, by more than three channels, signal to noise ratio adjustable.)

digital signal processing ***use interpolation file along with fft.rar file

Three-Phase Saturable Transformer This demonstration illustrates use of Three-phase, Powergui, and Multimeter blocks to study transformer saturation phenomenon G. Sybille (Hydro-Quebec)

LDPC译码算法，采用LOG方法，减少计算复杂度(LDPC decoding algorithm used LOG, to reduce the computational complexity)

解线性方程组的直接法（标准数值算法），包括高斯消去法程序、列主元高斯消去法程序、LU分解以及用LU分解求线性方程组、Cholesky分解以及用Cholesky分解求线性方程组、改进的Cholesky分解以及用改进的Cholesky分解求线性方程组、解三对角方程的追赶法。全部为本人原创程序，且全部经过测试无误。共9个MATLAB程序。程序内部含详细注释。(Solving linear equations of the direct method (standard numerical algorithms), including Gaussian elimination procedure, the column pivot Gaussian elimination procedure, LU decomposition and the use of linear equations, LU decomposition, Cholesky decomposition, and find line with the Cholesky decomposition linear equations, Cholesky decomposition and improved using the improved Cholesky decomposition of linear equations, solution of tridiagonal equations pursuit method. All of my original program, and all tested correctly. A total of nine MATLAB. Internal procedures with detailed notes.)

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本文基于MATLAB的数字图像处理环境，设计并实现了一个图像处理系统，论述了利用系统进行图像显示、图形绘制及图像处理过程。 (In this paper, MATLAB-based digital image processing environment, designed and implemented an image processing system, discusses the use of image display systems, graphics rendering and image processing.)