MATLAB: “Too many input arguments” for basic operations on transfer functions

Question

Hello,

I have a problem using the Control Model Toolbox that I never had before using Matlab R2019B.

Whenever I try to make some operations on transfer functions, I hace the same "Too many input arguments" problem.

For example :

>> s = tf('s');
>> s
s =
 
  s
 
Continuous-time transfer function.
>> 2*s
Error using  *  (line 80)
Too many input arguments.
 
>> s+1
Error using  +  (line 63)
Too many input arguments.
 
>> s^2
ans =
 
  s^2
 
Continuous-time transfer function.
>> tf(1,[1,1]) * tf(1,[1,2,1])
Error using  *  (line 80)
Too many input arguments.

As anyone ever met this problem ? My research hasn't led to any result.

Thanks

Answer 1

Actually, the reason was that I had a function called "conv" in my working directory. Renaming it solved the problem.