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Convert to float before sum

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Josep Sanjuas 2015-04-18 13:40:20 +02:00
commit f72bb57fff
1 changed files with 3 additions and 2 deletions
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lib/pure/math.nim
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@ -117,10 +117,11 @@ proc sum*[T](x: openArray[T]): T {.noSideEffect.} =
template toFloat(f: float): float = f template toFloat(f: float): float = f
proc mean*[T](x: openArray[T]): float {.noSideEffect.} = proc mean*[T](x: openArray[T]): float {.noSideEffect.} =
## computes the mean of the elements in `x`. ## computes the mean of the elements in `x`, which are first converted to floats.
## If `x` is empty, NaN is returned. ## If `x` is empty, NaN is returned.
## ``toFloat(x: T): float`` must be defined. ## ``toFloat(x: T): float`` must be defined.
result = toFloat(sum(x)) / toFloat(len(x)) for i in items(x): result = result + toFloat(i)
result = result / toFloat(len(x))
proc variance*[T](x: openArray[T]): float {.noSideEffect.} = proc variance*[T](x: openArray[T]): float {.noSideEffect.} =
## computes the variance of the elements in `x`. ## computes the variance of the elements in `x`.