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Fix std(::AbstractArray{<:AbstractFloat}) #26186

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Feb 24, 2018
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Fix std(::AbstractArray{<:AbstractFloat}) #26186

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2 changes: 1 addition & 1 deletion base/statistics.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -296,7 +296,7 @@ _std(A::AbstractArray{<:AbstractFloat}, corrected::Bool, mean, dims) =
sqrt!(var(A; corrected=corrected, mean=mean, dims=dims))

_std(A::AbstractArray{<:AbstractFloat}, corrected::Bool, mean, ::Colon) =
sqrt!(var(A; corrected=corrected, mean=mean))
sqrt.(var(A; corrected=corrected, mean=mean))

std(iterable; corrected::Bool=true, mean=nothing) =
sqrt(var(iterable, corrected=corrected, mean=mean))
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14 changes: 12 additions & 2 deletions test/statistics.jl
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Expand Up @@ -155,6 +155,17 @@ end
@test std([1,2,3]; mean=0) ≈ sqrt(7.0)
@test std([1,2,3]; mean=0, corrected=false) ≈ sqrt(14.0/3)

@test stdm([1.0,2,3], 2) ≈ 1.
@test std([1.0,2,3]) ≈ 1.
@test std([1.0,2,3]; corrected=false) ≈ sqrt(2.0/3)
@test std([1.0,2,3]; mean=0) ≈ sqrt(7.0)
@test std([1.0,2,3]; mean=0, corrected=false) ≈ sqrt(14.0/3)

@test std([1.0,2,3]; dims=1)[] ≈ 1.
@test std([1.0,2,3]; dims=1, corrected=false)[] ≈ sqrt(2.0/3)
@test std([1.0,2,3]; dims=1, mean=[0])[] ≈ sqrt(7.0)
@test std([1.0,2,3]; dims=1, mean=[0], corrected=false)[] ≈ sqrt(14.0/3)

@test stdm((1,2,3), 2) ≈ 1.
@test std((1,2,3)) ≈ 1.
@test std((1,2,3); corrected=false) ≈ sqrt(2.0/3)
Expand Down Expand Up @@ -409,9 +420,8 @@ end

@testset "Issue #17153 and PR #17154" begin
a = rand(10,10)
b = deepcopy(a)
b = copy(a)
x = median(a, dims=1)

@test b == a
x = median(a, dims=2)
@test b == a
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