.. _contexts:

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Contexts
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What are contexts
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Contexts allow us to provide a Width, Depth, and a coefficient field for a tensor. They also provide access to the Baker-Campbell-Hausdorff formula.

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How do contexts fit into RoughPy
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Contexts are the environment in which calculations are done. They are used everywhere in RoughPy, for any stream or algebraic object.

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How to work with contexts
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We can create **contexts** for :doc:`fundamentals.streams` in the following way. The example below has width 2, depth 6, and coefficients over the Reals.

::

    context = roughpy.get_context(width=2, depth=6, coeffs=rp.DPReal)