Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Productivity tools to study constrained motion: electrician's approach
  to mechanician's problem   An application design is offered, which students of physics can use when
authoring a solver for mechanical systems with constraints. A 'chainlist'
concept is introduced to capture a constrained mechanical system configuration
and to pass the simulation scenario to the solver application. Code samples are
given to start off the solver application (simulator) project. A short review
of linear algebra for constrained motion computations (pseudoinverse) is given.

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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio