Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Kalman Filter: a didactical overview   The present document aims at providing a short, didactical introduction to
three standard versions of the Kalman filter, namely its variants identified as
Basic, Extended, and Unscented. The application of these algorithms in three
representative problems is discussed.

2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas