Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Design and implementation of an Android application to anonymously
  analyse locations of the citizens in Barcelona   The MobilitApp application is able to obtain mobility data and type of
activity performed by a person. It runs in the background and stores the
information in synchronous periodic locations. The main work of this project
was to develop tools that facilitate the exploitation of the information
obtained, add elements that make it attractive to use the application and
spread it to a wider audience. With these new procedures, we manage to increase
the number of connected users, improve security with which sensitive user
information is managed and establish channels that will be used to add
additional functionality to the application in future works.

17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an