This is not a tridimentional matrix. Please follow the deprecation warning on 0.4.x.
julia> d = reshape([[a],[b],[c]], (2,2,3))
WARNING: [a] concatenation is deprecated; use collect(a) instead
in depwarn at ./deprecated.jl:73
while loading no file, in expression starting on line 0
WARNING: [a] concatenation is deprecated; use collect(a) instead
in depwarn at ./deprecated.jl:73
while loading no file, in expression starting on line 0
WARNING: [a] concatenation is deprecated; use collect(a) instead
in depwarn at ./deprecated.jl:73
while loading no file, in expression starting on line 0
WARNING: [a,b,...] concatenation is deprecated; use [a;b;...] instead
in depwarn at ./deprecated.jl:73
while loading no file, in expression starting on line 0
2x2x3 Array{Float64,3}:
[:, :, 1] =
1.0 1.0
1.0 1.0
[:, :, 2] =
1.0 1.0
1.0 1.0
[:, :, 3] =
1.0 1.0
1.0 1.0