How to use Zarrj.zgroup?

[truedichotomy]

I"d like to use the group functionality of Zarr. There is no documentation for it, can you give a couple of examples? Thanks.

[meggart]

Sorry for the lack of documentation. Here are a few examples, let me know when you need more. There definitely should be a section of working with groups in the docs.

julia> p = tempname()
"/tmp/jl_hKDcSI"

#Create a new Zarr group at path p
julia> g = zgroup(p)
ZarrGroup at DirectoryStore("/tmp/jl_hKDcSI") and path

#Create a sub-group of the group g
julia> g2 = zgroup(g,"subgroup")
ZarrGroup at DirectoryStore("/tmp/jl_hKDcSI") and path subgroup

#Create a new array inside group g2
julia> a = zcreate(Float32,g2,"anarray",10,5,2)
ZArray{Float32} of size 10 x 5 x 2

#Now g2 contains the array
julia> g2.arrays
Dict{String, ZArray} with 1 entry:
  "anarray" => ZArray{Float32} of size 10 x 5 x 2

#We open the base group and go through the hierarchy
julia> zopen(p)["subgroup"]["anarray"]
ZArray{Float32} of size 10 x 5 x 2

#Alternatively, for an existing store:
julia> s = Zarr.DictStore()
Dictionary Storage

#Create a Zarr group in the given store at path "mygroup"
julia> g = zgroup(s,"mygroup")
ZarrGroup at Dictionary Storage and path mygroup

[truedichotomy]

Is it possible to modify the group when once it's been created? The zopen's 'write' flag does not seem to be usable.

[meggart]

What exactly would you want to modify? I think using the write flag should work for modifying metadata and arrays within the group. Please post if you an an MWE with an error message.