how to create a fuction p(t)

i have to plot s(t) where s(t)=p(t)cos(wt)-p(t-2*pi)cos(wt)+cos(t-(3*pi/2))sin(wt)-p(t-(5*pi/2))sin(wt) where p(t)=cos(t) for -pi/2 to pi/2 =0 for else where w=2*pi*100*10^3

Answer 1

[Star Strider]

This runs. I will let you determine if it produces the result you want:

w=2*pi*1.0E+5;
p = @(t) cos(t) .* ((-pi/2 <= t) & (t <= pi/2));
s = @(t) p(t).*cos(w*t)-p(t-2*pi).*cos(w*t)+cos(t-(3*pi/2)).*sin(w*2*t)-p(t-(5*pi/2)).*sin(w*t);

t = linspace(-pi, 2*pi);

figure(1)
plot(t, s(t))
grid

[clowen]

thank u sir :)

[Star Strider]

My pleasure!