JuliaDiff / JuliaDiff/ForwardDiff.jl
Special case `x^1`
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Description
x^0 is special-cased here (see https://github.com/JuliaDiff/ForwardDiff.jl/issues/331)
Could x^1 also be special-cased a couple of lines later?
Currently it instead calculates 1 * x^0. When x == 0 that relies on 0^0 being defined correctly.
(This led to the error in https://github.com/JuliaDiff/ForwardDiff.jl/issues/411.)
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start in src/dual.jl at the linked x^0 special case and inspect the couple of lines that handle x^1. Confirm the current path can evaluate 1 * x^0 when x is zero, then verify that the x^1 behavior no longer depends on the 0^0 case and addresses the error described in issue #411.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- julia
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 1/5
- Estimated time
- Under an hour
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 48/100