Typeerror: Bad Operand Type For Abs(): 'referenceframe' But I Have No Abs() Function
I'm trying calculate the curl of a vector with its del operator, and so I'm using the curl from sympy and just having the vector cross with the reference frame, but I get this erro
Solution 1:
Use R[0]
instead of x
. I deduced this from the curl
examples (and trying to replicate some Wiki examples)
Running in isympy
(Can't import curl
from sympy
)
In [2]: from sympy.physics.vector import curl, ReferenceFrame
...: alpha = Symbol('\u03B1')
...: B0 = Symbol('B0')
...: R = ReferenceFrame('R')
...: V = B0*sin(alpha*R[0])*R.y + B0*cos(alpha*R[0])*R.z
...: print(V)
...: C = curl(V,R)
...: print(C)
...:
...:
B0*sin(R_x*α)*R.y + B0*cos(R_x*α)*R.z
B0*α*sin(R_x*α)*R.y + B0*α*cos(R_x*α)*R.z
There may be a way of factoring out the alpha
, or otherwise show that C
is alpha*V
. I'm just working through the sympy
tutorials.
In[4]: expand(C-alpha*V)
Out[4]: 0In[8]: VOut[8]: B₀⋅sin(Rₓ⋅α) r_y + B₀⋅cos(Rₓ⋅α) r_zIn[9]: COut[9]: B₀⋅α⋅sin(Rₓ⋅α) r_y + B₀⋅α⋅cos(Rₓ⋅α) r_z
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