JuliaLang/julia — pull request #7244 by andreasnoackjensen (2014-06-13 10:19:00+00:00)
Title: Make (c)transpose work correctly for block matrices

With this change, the matrix `Apd` generated by
```
julia> A=[randn(2,2) for i = 1:2,j=1:2]
2x2 Array{Array{Float64,2},2}:
2x2 Array{Float64,2}:
0.779435 -0.145332
2.06874 -1.24279 … 2x2 Array{Float64,2}:
0.036242 0.40966
0.584986 0.122122
2x2 Array{Float64,2}:
0.471302 0.577977
-1.77892 0.216775 2x2 Array{Float64,2}:
-1.17572 0.296942
1.41572 0.535884

julia> Apd = A'A;
```
will be positive definite.