numerical_integration

《智能控制》第一版（刘金琨著）第八章程序源码(" Intelligent control" the first edition (Liu Jinkun a) of Chapter VIII of program source code)

这是一个关于Kohonen神经网络的小程序，主要实现了利用神经网络进行聚类的功能，经测试具有良好效果(This is a small program on Kohonen neural network, the main achievement of the neural network clustering feature has been tested with good results)

turbo乘积码，子码扩展汉明码，译码用chase算法(turbo product code, subcode extended Hamming code decoding algorithm with chase)

AES coding end de-coding by matlab

有限元方法求解laplace 方程(matlab),可以用混合单元，混合边界条件(sloving Laplace eauations with finite element methods. )

自己编写的基于nlms的回波消除算法，直接能运行(I have written based nlms echo cancellation algorithm can be run directly)

RS编译码的matlab码源，经测试好用。(RS codec matlab source code)

k均值的 咱们做非监督分类都用过 不想理解他的原理吗 很重要(k mean we do not want unsupervised classification are used to understand his theory is very important to you)

Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each operand may be an integer or another expression. Some examples: [ 2 , 1 , + , 3 , * ] -> ((2 + 1) * 3) -> 9 [ 4 , 13 , 5 , / , + ] -> (4 + (13 / 5)) -> 6 分析：这一题就是写程序计算逆波兰式的结果，遍历表达式，碰到操作数入栈，碰到操作符就从栈顶取出两个操作数，再将计算后的结果入栈，最后栈中剩余的唯一操作数就是计算结果。(. Evaluate the value of an arithmetic expression in Reverse Polish Notation Valid operators are+,-,*,/Each operand may be an integer or another expression Some examples:.. [" 2" , " 1" , " +" , " 3 " ," * " ]-> ((2+ 1)* 3)-> 9 [" 4 " ," 13 " ," 5 " ," /" ," + " ]-> (4+ (13/After this problem is to write a program to calculate the inverse Polish results, iterate expression operand stack encounter, encounter operator to fetch two operands the stack, and then calculated as follows:> 6 Analysis- 5)) The results of the stack, the only remaining operand stack is the final calculations.)

Heat equation u_t=u_xx - finite difference scheme - theta method