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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: Please correct the energy
Replies: 3   Last Post: Oct 28, 2010 5:55 PM

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Dinesh Bhati

Posts: 24
Registered: 8/4/10
Re: Please correct the energy
Posted: Oct 27, 2010 1:04 PM
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"Dinesh Bhati" <bhatidinesh@gmail.com> wrote in message <ia8cs1$n7e$1@fred.mathworks.com>...
> Hi,
>
> Can any one correct the energy Emid. It should also be same as Ex and Ey and equal to one.Note for DB1 you will get the correct Emid.
>
> clear
> clc
> str='db2'
> x=randint(1,10,[1 10]);
> x=x/norm(x(:));
> Ex=sum(x.^2)
> [A,H]=dwt(x,str);
> Emid=sum(A.^2)+sum(H.^2)
> y=idwt(A,H,str);
> Ey=sum(y.^2)
>
> Dinesh


May I know what is the problem with the Emid. As per parsevals theorem it must be equal to one.



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