From c62fdbda9e97294dc2258b055c658591044ef599 Mon Sep 17 00:00:00 2001
From: "Steven G. Johnson" <stevenj@mit.edu>
Date: Thu, 21 Jun 2018 10:20:44 -0400
Subject: [PATCH] single-argument permutedims(x)

---
 README.md        | 3 +++
 src/Compat.jl    | 5 +++++
 test/runtests.jl | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/README.md b/README.md
index d80fadd43..25c5d4093 100644
--- a/README.md
+++ b/README.md
@@ -288,6 +288,8 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 * `squeeze` with `dims` as keyword argument ([#26660]).
 
+* Single-argument `permutedims(x)` for matrices and vectors ([#24839]).
+
 * `fetch` for `Task`s ([#25940]).
 
 * `Compat.qr` takes `pivot` as a `Val` _instance_ ([#22475]).
@@ -583,6 +585,7 @@ includes this fix. Find the minimum version from there.
 [#24785]: https://github.com/JuliaLang/julia/issues/24785
 [#24808]: https://github.com/JuliaLang/julia/issues/24808
 [#24831]: https://github.com/JuliaLang/julia/issues/24831
+[#24839]: https://github.com/JuliaLang/julia/issues/24839
 [#24874]: https://github.com/JuliaLang/julia/issues/24874
 [#24999]: https://github.com/JuliaLang/julia/issues/24999
 [#25012]: https://github.com/JuliaLang/julia/issues/25012
diff --git a/src/Compat.jl b/src/Compat.jl
index c81859531..cef0452ae 100644
--- a/src/Compat.jl
+++ b/src/Compat.jl
@@ -1936,6 +1936,11 @@ else
 end
 const ⋅ = dot
 
+if VERSION < v"0.7.0-DEV.2956" # julia#24839
+    Base.permutedims(A::AbstractMatrix) = permutedims(A, (2,1))
+    Base.permutedims(v::AbstractVector) = reshape(v, (1, length(v)))
+end
+
 # https://github.com/JuliaLang/julia/pull/27253
 @static if VERSION < v"0.7.0-alpha.44"
     Base.atan(x::Real, y::Real) = atan2(x, y)
diff --git a/test/runtests.jl b/test/runtests.jl
index c141d9898..099fca978 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1813,6 +1813,10 @@ let sep = Compat.Sys.iswindows() ? ';' : ':'
     end
 end
 
+# julia#24839
+@test permutedims([1 2; 3 4]) == [1 3; 2 4]
+@test permutedims([1,2,3]) == [1 2 3]
+
 # julia#27401
 import Compat: ⋅
 @test Compat.opnorm([1 2;3 4]) ≈ 5.464985704219043