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编程中Floor,CEil ,ABs等属于什么函数

select ABS(-6)*ceil(3.1)*floor(2.9) from dual 查询结果:48 ABS(-6)=6 取绝对值 ceil(3.1)=4 取得大于该的最小整数 floor(2.9)=2 向下取整 结果:6*4*2=48

function [Fn,An,Pn] = FFT_for(fs,x) f=50; m=3; N = length(x); Fn=zeros(m,1);% 谐波频率 An=zeros(m,1);% 幅值 Pn=zeros(m,...

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