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# how can i get back the original song into the program below?

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parthasarathi ghorai on 15 May 2015
Closed: MATLAB Answer Bot on 20 Aug 2021
a=zeros(100,2);
j=1;
for i=round(rand(1)*(10000-1)+1):round(rand(1)*(10000-1)+1)
a(j,:)=y(i,:);
j=j+1;
end
mi=min(a);
ma=max(a);
dif=ma(1,:)-mi(1,:);
c=dif(1)/255;
a=mi;
b=a+c;
x=zeros(255,2);
for i=1:255
x(i,:)=a;
a=a+c;
end
s=0;
for i=1:10
s=s+x(i,:);
end
a=s
z=0;
for(i=10:20)
z=z+x(i,:);
end
b=z
A=0;
for(i=20:30)
A=A+x(i,:);
end
c=A
B=0;
for(i=30:40)
B=B+x(i,:);
end
d=B
C=0;
for(i=40:50)
C=C+x(i,:);
end
e=C
D=0;
for(i=50:60)
D=D+x(i,:);
end
m=D
E=0;
for(i=60:70)
E=E+x(i,:);
end
g=E
F=0;
for(i=70:80)
F=F+x(i,:);
end
h=F
G=0;
for(i=80:90)
G=G+x(i,:);
end
n=G
H=0;
for(i=90:100)
H=H+x(i,:);
end
j=H
transfromed=fft(y);
f=abs(transfromed);
plot(f)
x=find(y<=20);
y(x);
y(x(1))=a(1);
y(x(2))=b(1);
y(x(3))=c(1);
y(x(4))=d(1);
y(x(5))=e(1);
y(x(6))=m(1);
y(x(7))=g(1);
y(x(8))=h(1);
y(x(9))=n(1);
y(x(10))=j(1);
y(1:10)
plot(y)

Walter Roberson on 16 May 2015
You cannot. You overwrite the first 10 locations in the first channel of y without having saved the previous contents. They are gone and cannot be recovered except by reading in the file again.
The rest of the song after the 10th entry is still there untouched in y(11:end,:), and any channel beyond the first is untouched.