MATLAB: Can anyone tell me what is wrong with this program

Question

clear all;

clc;

[y,fs,nbits]=wavread('fatmamedhat.wav');

sound(y,fs,nbits);

y=y(:,1);

fs=44100; %sampling frequency

FRAME_DURATION=0.03; %typical duration for frame

L=FRAME_DURATION*fs;

OVERLAPPED_DURATION=0.005; %overlapped duration

R=floor(OVERLAPPED_DURATION*fs);

X=buffer(y,L,R);

n=length(y);

t=(0:n-1)/fs; %times of sampling

%plotting the wave signal

subplot(2,1,1);

plot(t,y);

title('wave signal');

xlabel('Time (s)');

ylabel('Amplitude');

grid on;

%calculating the energy signal

temp=0;

i=1:y;

    temp=((y(i).^2+temp)>=0);

a=temp/10;

%plotting the energy of the wave file

subplot(2,1,2);

plot(i,a);

title('energy signal');

xlabel('Time (s)');

ylabel('Amplitude');

grid on;

Answer 1

1. Sound function generally takes in two arguments, but you have given three that includes nbits.

2. A for loop is missing, and should be based on the size/length of y

   for i=1:length(y);% y is size Nx1
      temp=((y(i).^2)>=0);
  end
  sum(temp)% total energy