I have a question regarding the
dwt functions in MATLAB.
I am using
wavdec(y,3,db4) on a size 1024 signal, which means I am trying to compute the third level
db4 transform of the size 1024 signal
y. If I am thinking about this correctly, theoretically the returned matrix after the transform should also be of size 1024.
However, when I perform the transform, the matrix I get returned is size 1044, which is 20 samples bigger than my original matrix.
Would anyone please be able to explain to me why this is happening?