R help - Aug 2010 - wavlet transform

Hello
I do wavelet transform by using this code:

dec=dwt(ld, filter='d8', n.levels=lev, boundary="reflaction");

dec consists of the decomposition coefficients and other

How can I change the coefficients the decomposition manualy?
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Hello

I wrote this simple code

lev=8;			
wname='d8';

dec=dwt(ld, filter=wname, n.levels=lev, boundary="periodic",
fast=TRUE);
i_ld=idwt(dec);


before
http://r.789695.n4.nabble.com/file/n2316043/1.png 1.png 
after
http://r.789695.n4.nabble.com/file/n2316043/2.png 2.png 

I don't uderstand why there is a difference  between signal befor dwt and
after idwt

thank you
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