You can simplify the declaration as follows:
MM = Matrix(Matrix(1,2))
You can use comprehensions too:
MM = [ randn(5,5) for x=1:2, y=1 ]
Here, MM has two rows and one column, and each of its elements is a 5x5
matrix.
-- mb
On Thu, Jun 23, 2016 at 9:28 PM, Sheehan Olver <[email protected]>
wrote:
> This caught me by surprise:
>
>
> *julia> **M=rand(5,5)*
>
> *5x5 Array{Float64,2}:*
>
> * 0.621195 0.30108 0.611089 0.880044 0.779199*
>
> * 0.100477 0.0581337 0.198601 0.639252 0.400357*
>
> * 0.716917 0.179181 0.548913 0.787072 0.157769*
>
> * 0.971473 0.981921 0.307854 0.201917 0.290429*
>
> * 0.43822 0.362467 0.160296 0.725931 0.850726*
>
>
> *julia> **Matrix{Float64}[M M]*
>
> *ERROR: MethodError: `convert` has no method matching
> convert(::Type{Array{Float64,2}}, ::Float64)*
>
> *This may have arisen from a call to the constructor
> Array{Float64,2}(...),*
>
> *since type constructors fall back to convert methods.*
>
> Closest candidates are:
>
> call{T}(::Type{T}, ::Any)
>
> convert{T,S,N}(::Type{Array{T,N}},
> *::SubArray{S,N,P<:AbstractArray{T,N},I<:Tuple{Vararg{Union{AbstractArray{T,1},Colon,Int64}}},LD}*
> )
>
> convert{T,n}(::Type{Array{T,n}}, *::Array{T,n}*)
>
> ...
>
> in copy! at abstractarray.jl:344
>
> in typed_hcat at abstractarray.jl:784
>
>
> What's the correct way to do this? The following works but is not ideal:
>
> *julia> **MM=Matrix{Matrix{Float64}}(1,2)*
>
> *1x2 Array{Array{Float64,2},2}:*
>
> * #undef #undef*
>
>
> *julia> **MM[1,1]=M;MM[1,2]=M*
>
>
>
>
>
