Error:File:E:\MATLAB7\work\Untitled3.m Line:5 Column:30 Missing variable or function.Wp=0.2pi;Ws=0.4pi;Rp=1;As=50;F=[Wp/pi,Ws/pi];dev=[(10^(Rp/20)-1)/(10^(Rp/20)+l),10^(-As/20)];[n,wn,beta]=kaiserord(F,[1 0],dev);h=fir1(n,wn,kaiser(n+1,beta),’nos

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$Error:File:E:\MATLAB7\work\Untitled3.m Line:5 Column:30 Missing variable or function.Wp=0.2*pi;Ws=0.4*pi;Rp=1;As=50;F=[Wp/pi,Ws/pi];dev=[(10^(Rp/20)-1)/(10^(Rp/20)+l),10^(-As/20)];[n,wn,beta]=kaiserord(F,[1 0],dev);h=fir1(n,wn,kaiser(n+1,beta),’nos$

Error:File:E:\MATLAB7\work\Untitled3.m Line:5 Column:30 Missing variable or function.Wp=0.2*pi;Ws=0.4*pi;Rp=1;As=50;F=[Wp/pi,Ws/pi];dev=[(10^(Rp/20)-1)/(10^(Rp/20)+l),10^(-As/20)];[n,wn,beta]=kaiserord(F,[1 0],dev);h=fir1(n,wn,kaiser(n+1,beta),’nos
Error:File:E:\MATLAB7\work\Untitled3.m Line:5 Column:30 Missing variable or function.
Wp=0.2*pi;Ws=0.4*pi;Rp=1;As=50;
F=[Wp/pi,Ws/pi];
dev=[(10^(Rp/20)-1)/(10^(Rp/20)+l),10^(-As/20)];
[n,wn,beta]=kaiserord(F,[1 0],dev);
h=fir1(n,wn,kaiser(n+1,beta),’noscale’)
freqz(h,1,1024)
Error:File:E:\MATLAB7\work\Untitled3.m Line:5 Column:30
Missing variable or function.这是为什么应该怎么改