JuliaGeometry / JuliaGeometry/Rotations.jl

QuatRotation construction using symbolics

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Dominant language
Julia
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Description

I was trying to use a symbolic to construct a QuatRotation but failed.

Can anyone help me to debug this or is it a limitation of this package?

using Symbolics
using Rotations


julia> @variables q[1:4] = [1.0, 0, 0, 0]
1-element Vector{Symbolics.Arr{Num, 1}}:
 q[1:4]

julia> QuatRotation(q...)
ERROR: MethodError: /(::Quaternions.Quaternion{Num}, ::Num) is ambiguous. Candidates:
  /(a::Number, b::Num) in Symbolics at /home/jinrae/.julia/packages/SymbolicUtils/qulQp/src/methods.jl:71
  /(q::Quaternions.Quaternion, x::Real) in Quaternions at /home/jinrae/.julia/packages/Quaternions/kqEsP/src/Quaternion.jl:123
Possible fix, define
  /(::Quaternions.Quaternion, ::Num)
Stacktrace:
 [1] sign(x::Quaternions.Quaternion{Num})
   @ Base ./number.jl:161
 [2] QuatRotation
   @ ~/.julia/packages/Rotations/VYTDG/src/unitquaternion.jl:22 [inlined]
 [3] QuatRotation
   @ ~/.julia/packages/Rotations/VYTDG/src/unitquaternion.jl:46 [inlined]
 [4] QuatRotation(w::Num, x::Num, y::Num, z::Num, normalize::Bool)
   @ Rotations ~/.julia/packages/Rotations/VYTDG/src/unitquaternion.jl:50
 [5] QuatRotation(w::Num, x::Num, y::Num, z::Num)
   @ Rotations ~/.julia/packages/Rotations/VYTDG/src/unitquaternion.jl:49
 [6] top-level scope
   @ REPL[35]:1
 [7] top-level scope
   @ ~/.julia/packages/Infiltrator/r3Hf5/src/Infiltrator.jl:710

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the Symbolics and Rotations interaction shown in the issue, then inspect Rotations/src/unitquaternion.jl at the QuatRotation constructors and the reported division dispatch. Compare the behavior with the Quaternions and Symbolics methods named in the error; the issue is done when the supported behavior is resolved and the ambiguity is either handled or clearly documented.

Written by the indexing model from the issue text.

Assessment

Tech stack
julia
Domain
computer-graphics
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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