cos_x.m

clc
clear all
fm = 400;
T = 1;
%t=[0:1/fm:T];
t=linspace(0:1:10)%from start to end ,(number of samples)
%t=[0:0.1:1]
y=cos(t);
%plot(y)
%stem(y)

%sin(2*pi*(f/fs)*n); f frequency and fs sampling frequency fs>=f
stem(sin(2*pi*(50/100)*[0:19]) %we want to plot 1 cycle therefore we want 20 samples      time vector how many cycle we want to plot