Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium Mechanics Printing
New issue 3015 by [email protected]: mpprint doesn't properly output
derivatives
http://code.google.com/p/sympy/issues/detail?id=3015
(This was originally reported at https://github.com/sympy/sympy/issues/995)
This is in regards to the physics.mechanics module.
In [33]: Tdelta.coeff(mG)
Out[33]: d*(d*(-wb1(t)*sin(delta(t)) +
wb2(t)*cos(delta(t)))*(wb1(t)*cos(delta(t)) + wb2(t)*sin(delta(t))) +
d*Derivative(wg3(t), t)) - d*(-ds1*wb2(t)**2 + ds3*Derivative(wb2(t), t) -
(ds1*wb3(t) - ds3*wb1(t))*wb3(t) + av1(t))*sin(delta(t)) +
d*(ds1*wb1(t)*wb2(t) + ds1*Derivative(wb3(t), t) + ds3*wb2(t)*wb3(t) -
ds3*Derivative(wb1(t), t) + av2(t))*cos(delta(t))
In [34]: me.mpprint(Tdelta.coeff(mG))
⎛ 2
d⋅(d⋅(-wb₁⋅sin(δ) + wb₂⋅cos(δ))⋅(wb₁⋅cos(δ) + wb₂⋅sin(δ)) + d⋅wg₃) - d⋅⎝-
ds₁⋅wb₂ (t) + ds₃⋅wb₂ - (ds₁⋅wb₃ - ds₃⋅wb₁)⋅
⎞
wb₃ + av₁⎠⋅sin(δ) + d⋅(ds₁⋅wb₁⋅wb₂ + ds₁⋅wb₃ + ds₃⋅wb₂⋅wb₃ - ds₃⋅wb₁ +
av₂)⋅cos(δ)
Notice that the Derivative terms are not distinguished in the mpprint
output. The should have a dot over top or set as dx/dt.
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