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Ran 21 Feb 2018 09:55PM UTC

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Committed 21 Feb 2018 09:48PM UTC coverage: 96.545% (-0.007%) from 96.552%

Job # 309.2

Build Type

push

travis-ci

Committed by

KristofferC

Commit Message

Use a more performant formula for haversine (#90)

* Use a more performant formula for haversine

```julia
using BenchmarkTools
Main> using BenchmarkTools

Main> a = rand()
0.8809105663628993

Main> @benchmark asin(sqrt($a))
BenchmarkTools.Trial:
  memory estimate:  0 bytes
  allocs estimate:  0
  --------------
  minimum time:     15.790 ns (0.00% GC)
  median time:      16.579 ns (0.00% GC)
  mean time:        17.691 ns (0.00% GC)
  maximum time:     712.929 ns (0.00% GC)
  --------------
  samples:          10000
  evals/sample:     1000

Main> @benchmark atan2(sqrt($a), sqrt(1-$a))
BenchmarkTools.Trial:
  memory estimate:  0 bytes
  allocs estimate:  0
  --------------
  minimum time:     24.080 ns (0.00% GC)
  median time:      24.870 ns (0.00% GC)
  mean time:        25.987 ns (0.00% GC)
  maximum time:     417.257 ns (0.00% GC)
  --------------
  samples:          10000
  evals/sample:     1000
Main> asin(sqrt(a)) ≈ atan2(sqrt(a), sqrt(1-a))
true
```

* Take minimum after square root in haversine

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