single-argument permutedims(x) (#582)

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

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)

test/runtests.jl

@@ -1816,6 +1816,10 @@ 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