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authorJosep Sanjuas <jsanjuas@gmail.com>2015-04-18 13:38:15 +0200
committerJosep Sanjuas <jsanjuas@gmail.com>2015-04-18 13:38:15 +0200
commit44246b670921aca1d31cb74dcc00139b5ed9a2c2 (patch)
treea3cd099d83ab4c267e611f502a409ff5d2a37d98
parente76f54e059fc89bb2cdab0a61700988c56b609d3 (diff)
downloadNim-44246b670921aca1d31cb74dcc00139b5ed9a2c2.tar.gz
Document toFloat is necessary
-rw-r--r--lib/pure/math.nim1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/pure/math.nim b/lib/pure/math.nim
index ef9c69e3c..05c2cf57c 100644
--- a/lib/pure/math.nim
+++ b/lib/pure/math.nim
@@ -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):