linux 下的shell编程，一些基础的shell编程内容，谢谢！-example： echo "this is the $numnd" grep "hello" file.txt | wc-l and so on!

学习MT4系统mql语言，轻松炒外汇。希望炒外汇的朋友，千万不能错过！-Learning MT4 system mql language, easy foreign exchange speculation. Hope that a friend of foreign exchange speculation, do not miss!

h（n）的长度N没有给定，仅给定通带边缘截止频率wc和阻带临界频率ws，以及相应的衰减，用窗函数法设计线性相位FIR低通滤波器-h (n) of length N is not given, only given pass band edge cutoff frequency wc and stop band the critical frequency ws, and the corresponding attenuation window function design linear pha