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Generalize mean to other types

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Josep Sanjuas 2015-04-12 19:40:30 +02:00
commit d0ff06b8c1
1 changed files with 5 additions and 2 deletions
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lib/pure/math.nim
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@ -114,10 +114,13 @@ proc sum*[T](x: openArray[T]): T {.noSideEffect.} =
## If `x` is empty, 0 is returned. ## If `x` is empty, 0 is returned.
for i in items(x): result = result + i for i in items(x): result = result + i
proc mean*(x: openArray[float]): float {.noSideEffect.} = template toFloat(f: float): float = f
proc mean*[T](x: openArray[T]): float {.noSideEffect.} =
## computes the mean of the elements in `x`. ## computes the mean of the elements in `x`.
## If `x` is empty, NaN is returned. ## If `x` is empty, NaN is returned.
result = sum(x) / toFloat(len(x)) ## ``toFloat(x: T): float`` must be defined.
result = toFloat(sum(x)) / toFloat(len(x))
proc variance*(x: openArray[float]): float {.noSideEffect.} = proc variance*(x: openArray[float]): float {.noSideEffect.} =
## computes the variance of the elements in `x`. ## computes the variance of the elements in `x`.