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Document toFloat is necessary

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Josep Sanjuas 2015-04-18 13:38:15 +02:00
commit 44246b6709
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lib/pure/math.nim
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@ -125,6 +125,7 @@ proc mean*[T](x: openArray[T]): float {.noSideEffect.} =
proc variance*[T](x: openArray[T]): float {.noSideEffect.} =
## computes the variance of the elements in `x`.
## If `x` is empty, NaN is returned.
## ``toFloat(x: T): float`` must be defined.
result = 0.0
var m = mean(x)
for i in items(x):