Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Using Newton's method to model a spatial light distribution of a LED
  with attached secondary optics   In design of optical systems based on LED (Light emitting diode) technology,
a crucial task is to handle the unstructured data describing properties of
optical elements in standard formats. This leads to the problem of data fitting
within an appropriate model. Newton's method is used as an upgrade of
previously developed most promising discrete optimization heuristics showing
improvement of both performance and quality of solutions. Experiment also
indicates that a combination of an algorithm that finds promising initial
solutions as a preprocessor to Newton's method may be a winning idea, at least
on some datasets of instances.

9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph