matlab helping

[partnera]

please help me in matlab why the following code is error



t=-10:0.1:10;
T0=1;
V=1;
x=V*square(t);
w0=2*pi/T0;
index=0;
for k=1:2:5

index=index+4*V/(k*pi)*cos(k*w0*t/2/pi-pi/2);

end
plot(t,x,t,index,'linewidth',3)
legend('original signal','approximation')
axis([-4 4 -3 3])
er=abs(x-index);
figure
plot(t,er,'linewidth',3)
legend('error')
axis([-4 4 -3 3])



it just gives me ::

Error in ==> Untitled at 5
x=V*square(t);

??? Error: File: Un8d3.m Line: 1 Column: 12
Unexpected MATLAB expression.

[soranz]

Isn't there a MATLAB forum - this is c++ :/ ?

[toum]

The problem is that square is not defined.