[julia-users] reversing each row of a matrix, in place

[Thomas Magnusson]

The in place reverse! function works of vectors:

julia> a = collect(1:4);
julia> reverse!(a)
4-element Array{Int64,1}:
 4
 3
 2
 1

But, how should I do to reverse each row of a matrix, without resorting to 
copy it ?  The naïve way, seems to create a copy of the row before 
reversing:

julia> a = collect(1:16);
julia> b = reshape(a, (4,4))
4x4 Array{Int64,2}:
 1  5   9  13
 2  6  10  14
 3  7  11  15
 4  8  12  16
julia> reverse!(b[1,:])
4-element Array{Int64,1}:
 13
  9
  5
  1
julia> b
4x4 Array{Int64,2}:
 1  5   9  13
 2  6  10  14
 3  7  11  15
 4  8  12  16


The original Matrix is unaffected.  How should this be done ?