Too many input arguments using square

As the title says for some reason square command has too many input arguments I don't know why. Done the same example a while ago and all worked.

tmax=9e-3;
T=3e-3;
Umax=2;
Umin=-3;
N=19;
a=0.6;
wo=(2*pi)/T;
t=linspace(0,tmax,2001);
U=square(wo*t,100*a);
U=0.5*(Umax-Umin)*U+0.5*(Umax+Umin);
td=linspace(0,tmax,N);
Ud=square(wo*td,100*a);
Ud=0.5*(Umax-Umin)*Ud+0.5*(Umax+Umin);
close all;
plot(t,U,'b');
grid on; zoom on; hold on;
stem(td,Ud,'r*');

[Torsten]

Check whether you have the Signal Processing Toolbox installed and licensed.

Answer 1

[KSSV]

Code is working fine. It seems you have introduced a variable named square. Clear it and then run the function. REad about clear

clear square 
tmax=9e-3;
T=3e-3;
Umax=2;
Umin=-3;
N=19;
a=0.6;
wo=(2*pi)/T;
t=linspace(0,tmax,2001);
U=square(wo*t,100*a);
U=0.5*(Umax-Umin)*U+0.5*(Umax+Umin);
td=linspace(0,tmax,N);
Ud=square(wo*td,100*a);
Ud=0.5*(Umax-Umin)*Ud+0.5*(Umax+Umin);
close all;
plot(t,U,'b');
grid on; zoom on; hold on;
stem(td,Ud,'r*'); 

[Arkadius882]

Still doesn't work. Used clear command, even copied the code to another function and there's still the same error.

[KSSV]

What does which square gives..?

which square 

/MATLAB/toolbox/signal/signal/square.m

[Arkadius882]

Okay, I finally managed to fix it. As you said the problem was that I named function square and despite using clear square the problem still occured. I had to delete that badly named function. Thanks a lot!

[KSSV]

One should avoid naming function name/ variable name with inbuilt function names.

:)

[Arkadius882]

Now I know it, thank you again :)