This is a question about efficiency. Suppose I have a routine which performs an operation in the same manner on an array irrespective of whether the entries are Int, Float or Complex. The output type will be an array with the same data-type. How can I implement that without overloading the function …

As a general rule, it is important to label fields of a struct or the elements of a container you are constructing with their types, but you do not need to label the types of your function inputs for performance. In fact, it says so right here in the manual: Performance Tips · The Julia Language I…

This is extremely useful, including the comparative tests ! Thank you very much for your time and effort !

A follow-up question : suppose I wish to pass an argument which is Array of arbitrary type but exactly 2 dimensions. What would be the syntax ?

If you mean an array with 2 elements, like [3, 4], then the answer is that you cannot restrict the length of an array like that, since the type of a standard Julia array does not contain the information about its length. A good alternative would be to use a tuple instead: julia> f(x, (y, z)) = x *…

Or you can check out StaticArrays for small fixed-size arrays: https://github.com/JuliaArrays/StaticArrays.jl

What you are probably looking for here is a Tuple not an Array. The difference is that Tuples allow inference on small statically sized heterogeneous collections.

@Oscar_Smith @rdeits @dpsanders I apologize, I meant 2 dimensional array as input with unspecified data-type.

Passing arrays with unspecified type

General Usage

rdeits May 20, 2020, 3:04am 9

Ah, that would be f(a::AbstractMatrix) or equivalently f(a::AbstractArray{T, 2}) where T

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Passing arrays with unspecified type

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