confusing about the operator

There is a code of operator:
SHI=Wavelet('Daubechies', 6,4);
FI=randn(40,100);
A=@(x) FI*(SHI'*x)
At=@(x) SHI*(FI'*x)
i am confusing about the operator. Is it write or wrong?

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on 14 May 2014

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