can any one explain sum(sa1.^2) and unit energy

b=randint(1,n);
f1=1;f2=2;
t=0:1/30:1-1/30;
%ASK
sa1=sin(2*pi*f1*t);
E1=sum(sa1.^2);
sa1=sa1/sqrt(E1); %unit energy 
sa0=0*sin(2*pi*f1*t);

[Andreas Goser]

What is your question sandy?

Answer 1

[Sean de Wolski]

break it down into components:

sa1 %variable or function with no inputs and at least one output
sa1.^2 %sa1 squared element by element
sum(sa1.^2) %the sum of the above