Status: Accepted
Owner: ----
CC: [email protected], [email protected]
Labels: Type-Defect Priority-Medium Mechanics
New issue 2836 by [email protected]: multiple iterations through
ReferenceFrame instances return empty list
http://code.google.com/p/sympy/issues/detail?id=2836
When resolving a Vector instance into it's components in some frame, or
creating a Vector by multiplying a sympy expression by each of the unit
vectors of some frame, it is convenient to use a for loop or a list
comprehension. However, when iterating more than once through the unit
vectors of a ReferenceFrame, an empty list results.
from sympy.physics.mechanics import ReferenceFrame
l = [1, 2, 3]
U = ReferenceFrame('U')
zip(l, U)
[(1, U.x), (2, U.y), (3, U.z)]
zip(l, U)
[]
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