Julia: Index an array with Int64?

Question

The following code complains ``` ERROR: `setindex!` has no method matching setindex!(::Type{Array{Int32,32}}, ::Int32, ::Int64) ``` Should I be able to do this? The problem, I think, is that the loop variable has the wrong type to be used as an array index? ``` n = parseint(readline(STDIN)) A = Array{Int32, n} for i in 1:n-1 ai = parseint(Int32, readuntil(STDIN, ' ')) A[i] = ai #The error happens here! end A[n] = parseint(Int32, readline(STDIN)) ```

Accepted Answer

Your assignment of A is legal, but it doesn't do what you think it does.

```
A = Array{Int32,n}

julia> typeof(A)
DataType
```

This declares an A to be the type representing an array of n dimensions. What you want instead, probably is A to be a variable of type Array{Int32,1} that contains n elements. So instead try the following:

```
A = Array(Int32,n);

julia> typeof(A)
Array{Int32,1}
```

Julia: Index an array with Int64?

Solution

Problem