绘制出R/S分析的有关图形的程序,比较方便好用-Draw R/S analysis of the procedures relating to graphics, easy-to-use comparison

geda的gerber文件工具，能查看标准的gerber文件-# Gerbv is a viewer for Gerber RS-274X files, Excellon drill files, and CSV pick-and-place files. # Gerbv is a native Linux application, and it runs on many common unix platforms. # Gerbv is free/ open-source softwa

设计一个IIR数字低通滤波器， 逼近一组模拟滤波器的指标参数（通带截止频率Wp=2*pi*2000rad/s,阻带边界频率Ws=2*pi*3000rad/s,通带波纹 Rp=3db, 阻带衰减Rs=15db, 采样频率f=10000Hz）； 分别用脉冲响应不变法和双线性变换法实现设计，列出传递函数并描绘模拟和数字滤波器的幅频和相频响应曲线。用上述设计滤波器完成几组给定信号的滤波，证明滤波器的有效性和滤波范围限制.-Design a IIR digital low-pass filter, app

基于建筑抗震设计规范的反应谱（地震影响系数曲线）-Response Spectrum based on anti-seismic code for buildings