%Setting?up?exponential?signal?vector?to?be?down?sampled

?
clc;
clear?all;

%?example
%?Enter?length?of?the?output?sequence:45
%?Enter?down?sampling?factor:3
%?Enter?the?value?of?base?of?exponent?function:0.95


N=input（‘Enter?length?of?the?output?sequence:‘）;
M=input（‘Enter?down?sampling?factor:‘）;
a=input（‘Enter?the?value?of?base?of?exponent?function:‘）;

n=0:N-1;
m=0:N*M-1;
x=a.^m;

%?Generate?the?downsampled?signal?下采樣?
y=x（[1:M:lengt