CODEWITHSUNDEEP
julia
JobJob
JobJob

Reputation: 4137

How to convert an Array of type Any to a specific type

Say I have:

arr = {"a" "b" "r"}
> 1x3 Array{Any,2}:
> "a"  "b"  "r"

and I want it to be of type Array{Symbol,2} say.

Upvotes: 1

Views: 918

Answers (3)

born_naked
born_naked

Reputation: 798

Just since this seems to be the top result when I search for this, I will break out my comment into an answer for visibility.

The accepted answer no longer appears to work. See this link for relevant discussion.

I would recommend using a list comprehension.

Accepted method

arr = ["a" "b" "c"]
1×3 Matrix{String}:
 "a"  "b"  "c"

convert(Array{Symbol}, arr)
ERROR: MethodError: Cannot `convert` an object of type String to an object of type Symbol

Recommended per @DNF comment below.

Symbol.(arr)
1×3 Matrix{Symbol}:
 :a  :b  :c

Possible solution that may not respect shape.

[Symbol(a) for a in arr]
1×3 Matrix{Symbol}:
 :a  :b  :c

Upvotes: 0

tholy
tholy

Reputation: 12179

There's also

julia> convert(Array{Symbol}, arr)
1x3 Array{Symbol,2}:
:a  :b  :r

Upvotes: 4

JobJob
JobJob

Reputation: 4137

This works:

symarr = reshape(Symbol[arr...],size(arr)...)

Note also if all the elements in the array are of the type you want, you can use:

strarr = reshape([arr...],size(arr)...)

If you're happy with a Vector, you can simply use:

symvec = Symbol[arr...]
strvec = [arr...]

Also here's a macro for fun:

macro convarr(a, t)
    :(reshape($t[$a...],size($a)...))
end
@convarr arr Symbol

Note that all the above create new copies of the original Array{Any,2} array

Upvotes: 1

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