Curve fitting square wave

Hi,

When I run ; i=0; t0 = clock; while etime(clock, t0) < 10 disp(clock); pwm(i)=0; i = i +1; tic while toc<secs end pwm(i)=1; i = i +1; tic while toc<secs end end plot(i,pwm(i);

Graph has only one component and it shows very limited portion of the entire signal. I would like to generate a square pwm wave.

i=1 pwm=1 i=2 pwm=0 i=3 pwm=1 . . .

And when I plot pwm(i), I want to see the square wave.

Thanks.