CODEWITHSUNDEEP
julia
Lvassilopoulos
Lvassilopoulos

Reputation: 105

Julia | Array Element as an Argument of Another Array

I have a problem with indexing when an array element is an argument to another array. It results in an "invalid index 1.0" error. For example:

i = 0    

for l in 1:length
    for s in 1:ser
        for x in 1:s

        i = i + 1

        arr1[i] = x

        end
    end
end



for ts in 1:tiser

arr2[ts] = arr3[arr1[ts]]

end

Here is the code that you can copy to a REPL and find the error. What I get is an index error.

arr1 = Array{Float64,1}(1500)   
arr2 = Array{Float64,1}(10000)
arr3 = Array{Float64,1}(10000)


for z in 1:100

    arr3[z] = 1 + z

end


i = 0    

for l in 1:100
    for s in 1:5
        for x in 1:s

        i = i + 1

        arr1[i] = x

        end
    end
end



for ts in 1:10000

    arr2[ts] = arr3[arr1[ts]]

end

println(arr2[3])

Thank you

Upvotes: 0

Views: 416

Answers (1)

Felipe Lema
Felipe Lema

Reputation: 2718

You need to cast the floating number from arr1 to use it as index. I modified the Minimum Working Example to work:

arr1 = Array{Float64,1}(1500)   
arr2 = Array{Float64,1}(10000)
arr3 = Array{Float64,1}(10000)


for z in 1:100

    arr3[z] = 1 + z

end


i = 0    

for l in 1:100
    for s in 1:5
    for x in 1:s
        i = i + 1
        arr1[i] = x
    end
    end
end

println(arr1[1:20])

for ts in 1:10000
    from_arr1_as_index=Int(arr1[(ts-1)%1500+1])
    arr2[ts] = arr3[from_arr1_as_index]
end


println(arr2[3])

Upvotes: 1

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