Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Physics of Compressive Sensing and the Gradient-Based Recovery
  Algorithms   The physics of compressive sensing (CS) and the gradient-based recovery
algorithms are presented. First, the different forms for CS are summarized.
Second, the physical meanings of coherence and measurement are given. Third,
the gradient-based recovery algorithms and their geometry explanations are
provided. Finally, we conclude the report and give some suggestion for future
work.

0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom