chengxu

特征选择方法,matlab实现增 l减 r法 顺序后退法 SFFS 特征选择 顺序前进法特征选择(feature selection)

说明：  用QR分解来解方程AX=b，其中QR分解是用householder变换做的(With QR decomposition to solve the equation AX = b, where QR decomposition is done using householder transformation)

说明：  　尺度不变特征转换(Scale-invariant feature transform 或 SIFT)(Scale Invariant Feature Transform (Scale-invariant feature transform, or SIFT))

Koch曲线是通过图形迭代的方式产生的，其迭代规则是：对一条线段，首先将它分成三等份，然后将中间的一份替换成以此为底边的等边三角形的另外两条边。无限次迭代下去，最终形成的曲线就是Koch曲线。(Koch curve is generated by way of graphical iteration, and its iteration rule is: for a segment, it is divided into three equal parts first, and then replace the middle of a bottom side of this equilateral triangle to the other two edges. Infinite iterations continue, the final form of the curve is the Koch curve.)

各种奇异值分解的源码程序，内容详细易懂，可以直接在自己的程序中调用使用(Singular value decomposition of various program source code, detailed and easy to understand, you can call directly in their own procedures)

说明：  研究小波阈值去噪算法和经验模态分解算法，对心磁信号的去噪过程(Study the denoising process of wavelet threshold denoising algorithm and empirical mode decomposition algorithm for magnetic heart signal)

求解函数的的极值，可以较快较准的找到局部极值。(Ask the extreme value of the function)

说明：  根据教科书上已经给出的简单的数学算式，运用matlab编写出简单的代码，计算出结果(According to the textbook has been given a simple mathematical formula, using matlab write simple code to calculate the results)

包含十种经典的软件滤波的说明，以及其中8种滤波的例子，都是带的学生写的，并且附带测试报告。(Contains ten kinds of classic filtering software descriptions and examples of which eight kinds of filtering are written with students, and with a test report.)

认知无线电系统中存在载波频偏的OFDM频谱感知技术1001-0548(2013)03-0355-05 (OFDM Signal Sensing Scheme for Cognitive Radio in the Presence of Carrier Frequency Offset.)