Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Planar Sandwich and Other 1D Planar Heat Flow Test Problems in
  ExactPack   This report documents the implementation of several related 1D heat flow
problems in the verification package ExactPack. In particular, the planar
sandwich class defined by Dawes et al., as well as the classes
PlanarSandwichHot, PlanarSandwichHalf, and other generalizations of the planar
sandwich problem, are defined and documented here. A rather general treatment
of 1D heat flow is presented, whose main results have been implemented in the
class Rod1D. All planar sandwich classes are derived from the parent class
Rod1D.

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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: astro-ph