CODEWITHSUNDEEP
arraysinitializationjulia
Mahmut215
Mahmut215

Reputation: 129

Initialize an array in Julia

I have this code: A = Array{Float64,4}(undef, 2,1,1, 4) and it gives me an array with size (2,1,1,4) with random numbers. How I can initialize this array?

Upvotes: 8

Views: 7771

Answers (2)

fredrikekre
fredrikekre

Reputation: 10984

You can use fill! to fill it with whatever you want:

julia> A = Array{Float64,2}(undef, 2, 3)
2×3 Array{Float64,2}:
 6.93727e-310  6.93727e-310  6.93727e-310
 6.93728e-310  6.93727e-310  0.0         

julia> fill!(A, 42.0);

julia> A
2×3 Array{Float64,2}:
 42.0  42.0  42.0
 42.0  42.0  42.0

Note that you could have used fill directly:

julia> fill(42.0, 2, 3)
2×3 Array{Float64,2}:
 42.0  42.0  42.0
 42.0  42.0  42.0

and if you want it zeroed (which is pretty common) you can use zeros:

julia> zeros(2, 3)
2×3 Array{Float64,2}:
 0.0  0.0  0.0
 0.0  0.0  0.0

Upvotes: 7

logankilpatrick
logankilpatrick

Reputation: 14501

The code below produces an Array that is initialized with random values. 

julia> rand(Int8, 2,1,1,4)
2×1×1×4 Array{Int8,4}:
[:, :, 1, 1] =
 114
  26

[:, :, 1, 2] =
 -52
 -96

[:, :, 1, 3] =
  42
 -53

[:, :, 1, 4] =
 -106
   47

See the Julia Docs for more about Array initialization.

Upvotes: 1

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