代码参数说明:Sf1为书中公式3.19,Sf2为时域信号快速傅里叶表达式,两种频谱表达式所做出的图可看出其区别
代码如下:
clc
clear all
close all%参数设置
TBP 720; %时间带宽积
T 10e-6; %脉冲持续时间%参数计…
获取每月累计数据: SELECT a.month, SUM(b.total) AS total FROM ( SELECT month, SUM(sum) AS total FROM ( SELECT to_char(date("Joinin"),YYYY-MM) AS month , COUNT(*) AS sum FROM "APP_HR_Staff_Basic_Info" GROUP BY month ) …