Error:File:C:\MATLAB7\work\Untitled.m Line:1 Column:1 Missin

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Error:File:C:\MATLAB7\work\Untitled.m Line:1 Column:1 Missing variable or function.
>> num1=[1,1];
>> den1=[1,1,1,0];
>> num2=[2,3];
>> den2=[1,2,1];
>> G1=tf(num1,den1);G2=tf(num2,den2);
>> Gzp1=zpk(G1); Gzp2=zpk(G2);
>> [nums,dens]=series(num1,den1,num2,den2);
>> Gs=G1*G2;
>> [nump,denp]=parallel(num1,den1,num2,den2);
>> Gp=G1+G2;

$Error:File:C:\MATLAB7\work\Untitled.m Line:1 Column:1 Missin$

错误提示与代码不对应吧,我运行了下程序没有错误.
Gzp1,Gzp2,Gs,Gp的结果分别如下
Zero/pole/gain:
(s+1)
----------------
s (s^2 + s + 1)
Zero/pole/gain:
2 (s+1.5)
---------
(s+1)^2
Transfer function:
2 s^2 + 5 s + 3
-------------------------------
s^5 + 3 s^4 + 4 s^3 + 3 s^2 + s
Transfer function:
2 s^4 + 6 s^3 + 8 s^2 + 6 s + 1
-------------------------------
s^5 + 3 s^4 + 4 s^3 + 3 s^2 + s

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