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I'm trying to create an array of two arrays. However, a = [[1, 2], [3, 4]] doesn't do that, it actually concats the arrays. This is true in Julia: [[1, 2], [3, 4]] == [1, 2, 3, 4]. Any idea?
As a temporary workaround, I use push!(push!(Array{Int, 1}[], a), b).
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Here, you can give any value for 'dims' and an array of that dimension will be created. An Array in Julia can be created with the use of a pre-defined keyword Array() or by simply writing array elements within square brackets([]). There are different ways of creating different types of arrays.
To initialize an empty array, it is perfectly valid to use n = 0 in the above expressions. A possible source of errors would be to confuse this array with an empty array of “Any” type, which is initialized as follows: v = [] # Same as Any[], and you can't change this type easily later (gotcha!)
The easiest way to initialize them are probably list comprehensions, for example: julia> [[Vector{Float64}(undef, 4) for _ = 1:5] for _ = 1:6] 5-element Array{Array{Array{Float64,1},1},1}: ...
This is usually called with the syntax Type[] . Element values can be specified using Type[a,b,c,...] . zeros([T=Float64,] dims::Tuple) zeros([T=Float64,] dims...) Create an Array , with element type T , of all zeros with size specified by dims .
If you want an array of arrays as opposed to a matrix (i.e. 2-dimensional Array):
a = Array[ [1,2], [3,4] ] You can parameterize (specify the type of the elements) an Array literal by putting the type in front of the []. So here we are parameterizing the Array literal with the Array type. This changes the interpretation of brackets inside the literal declaration.
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Sean Mackesey's answer will give you something of type Array{Array{T,N},1} (or Array{Array{Int64,N},1}, if you put the type in front of []). If you instead want something more strongly typed, for example a vector of vectors of Int (i.e. Array{Array{Int64,1},1}), use the following:
a = Vector{Int}[ [1,2], [3,4] ] If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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