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Complex valued pow gives stackoverflow error #486

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Complex valued pow gives stackoverflow error#486

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@GiggleLiu
GiggleLiu
opened on Dec 2, 2020
julia> using ForwardDiff: Dual

julia> x = Complex(Dual(2, 1.0), Dual(3.0, 0.0))
Dual{Nothing}(2.0,1.0) + Dual{Nothing}(3.0,0.0)*im

julia> x^2
ERROR: StackOverflowError:
Stacktrace:
 [1] Complex at ./complex.jl:12 [inlined] (repeats 2 times)
 [2] float at ./complex.jl:1016 [inlined]
 [3] _cpow(::Complex{Dual{Nothing,Float64,1}}, ::Complex{Dual{Nothing,Float64,1}}) at ./complex.jl:780 (repeats 79984 times)

versioninfo: Julia v1.5.2, ForwardDiff v0.10.12

Also see the error report here: QuantumBFS/Yao.jl#263 (comment)
The second point.

Activity

  1. mcabbott commented on Dec 4, 2024

    @mcabbott
    mcabbott
    on Dec 4, 2024
    Member

    The behaviour on ForwardDiff#master, i.e. 0.11-DEV which includes #481, is this:

    julia> using ForwardDiff: Dual

julia> x = Complex(Dual(2, 1.0), Dual(3.0, 0.0))
Dual{Nothing}(2.0,1.0) + Dual{Nothing}(3.0,0.0)*im

julia> x^2
Dual{Nothing}(-5.0,4.0) + Dual{Nothing}(12.0,6.0)*im

  2. KristofferC commented on Mar 26, 2025

    @KristofferC
    KristofferC
    on Mar 26, 2025
    Collaborator

    Since it doesn't stackoverflow anymore I will close this.

  3. KristofferC
    closed this as completedon Mar 26, 2025
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