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A reference frame in classical mechanics. ReferenceFrame is a class used to represent a reference frame in classical mechanics. It has a standard basis of three unit vectors in the frame's x, y, and z directions. It also can have a rotation relative to a parent frame; this rotation is defined by a direction cosine matrix relating this frame's basis vectors to the parent frame's basis vectors. It can also have an angular velocity vector, defined in another frame.

src/s/y/sympy-HEAD/sympy/physics/mechanics/functions.py

**sympy**(Download)

'Lagrangian'] from sympy.physics.mechanics.essential import (Vector, Dyadic, ReferenceFrame, MechanicsStrPrinter, MechanicsPrettyPrinter,

src/s/y/sympy-HEAD/sympy/physics/mechanics/rigidbody.py

**sympy**(Download)

from sympy import sympify from sympy.physics.mechanics.point import Point from sympy.physics.mechanics.essential import ReferenceFrame, Dyadic

src/s/y/sympy-HEAD/sympy/physics/mechanics/kane.py

**sympy**(Download)

from sympy.core.compatibility import reduce from sympy.utilities import default_sort_key from sympy.physics.mechanics.essential import ReferenceFrame, dynamicsymbols from sympy.physics.mechanics.particle import Particle from sympy.physics.mechanics.point import Point