Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discussion of: Treelets--An adaptive multi-Scale basis for sparse
  unordered data   Discussion of "Treelets--An adaptive multi-Scale basis for sparse unordered
data" [arXiv:0707.0481]

12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin