iphone 8数据线包装:b = firgr(n,f,a,w)

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MATLAB里这样描述b = firgr(n,f,a,w) returns a length n+1 linear phase FIR filter which has the best approximation to the desired frequency response described by f and a in the minimax sense. w is a vector of weights, one per band. When you omit w, all bands are weighted equally. 其中权重W究竟是什么意思?怎么设置参数?

b = firgr(n,f,a,w) 已知集合M=｛a,b,c｝，N=｛-1，0，1｝，从M到N的映射f满足f(a)+f(b)+f(c)=0,那么映射f的个数为？若A=B=N,f:x→!x-3!.是不是A到B的映射.? f(a+mx)=f(b-mx) w x n,d w b n s,w x w n n m b 设a、b∈R,且a≠b,m=|f(a)-f(b)| 为什么f(x)=ax^2+b|x|+c (a≠0)的图象是个W? 已知{a n}为等比数列，且b n=a n + a n+1 f(x)=ax+b f(f(f(x)))=8x+21 求a+b head(((a,b),(e,f)))=?