JuliaApproximation / JuliaApproximation/ApproxFun.jl
cumsum error
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- Dominant language
- Julia
- Stars
- 559
- Forks
- 71
- PR merge metrics
- No merged PRs in 30d
Description
I'm just trying to make a function for the arclength along a space-curve.
curve(u) = [1.,0.,cos(u)]
dist = arclength(curve)
speed = Fun(u->hypot(derivative(curve,u)...),0..pi)
sum(speed) # 2.0 works!
cumsum(speed)(pi) # 0.0 doesn't work!
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Research direction
Reproduce the Julia snippet in an ApproxFun.jl environment, beginning with the cumsum(speed)(pi) call and the implementation or tests for cumsum on Fun values. Compare its result with the working sum(speed) calculation; done means cumulative evaluation at pi returns the expected arc-length value without breaking existing cumsum behavior.
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Assessment
- Tech stack
- julia
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100