I need an empty array with type Tuple{Float64} to solve the following problem.
I want to scatter points using CairoMakie.
The following code works:
using CairoMakie
scatter([(1, 1)])
The following code doesn’t work:
using CairoMakie
a=[]
push!(a, (1, 1))
scatter(a)
I want to use an empty array here because I will push elements using for loop next.
I think I need something like a=[]::Array{Tuple{Float64}}
but it doesn’t work.
This should work:
using CairoMakie
a = Array{Tuple{Float64, Float64}}(undef, 1)
for i in 1:5
push!(a, (i, i))
end
scatter(a)
Note that I have assumed that your data are of type Float64
in general.
2 Likes
julia> A = Tuple{Int64,Int64}[]
Tuple{Int64, Int64}[]
julia> push!(A, (1,1))
1-element Vector{Tuple{Int64, Int64}}:
(1, 1)
julia> A[1]
(1, 1)
Maybe this is what you need.
5 Likes
DNF
4
If you are going to push!
to it, then the size should be zero, not one. Otherwise, there will remain a garbage value at the first index.
5 Likes
Sorry, my bad! You are of course right
photor
6
Then
a = Array{Tuple{Float64, Float64}}(undef, 0)
will be what you need.