filters6.m

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   fs=100;
   t=0:1/fs:1;
   x=sin(2*pi*t*3)+0.25*sin(2*pi*t*40);
   b=ones(1,10)/10;
   y=filtfilt(b,1,x);
   yy=filter(b,1,x);
   plot(t,x,t,y,'-',t,yy,':');