All declarations (or bindings as we tend to call them) are done via the let keyword.
let myArray = Array2D.create ...
Cheers,
Rob
Maybe I wasn't very clear. I'll try to give an example of what I am trying to do...
type Node (id: int, enabled: bool) =
member v.Id = id
member v.Enabled = enabled
let arr = Array2D.create 10 10
arr.[0,0] = Node 0 false
I want to create a 10 by 10 matrix containing a bunch of nodes. The adding of the nodes is not done a binding time, but at run-time...
1 2
let arr = Array2D.zeroCreate 10 10 arr.[0,0] <- Node (0,false)
omg, immutability is a bitch
what? good thing?
I can understand some data needed to remain as is instantiated!
I'm new and don't know yet the diference between create and zeroCreate. (??)
Yesterday, I had no problem with initiating my array with numbers
cube.[i,j,k] <- i * 16 + j * 4 + k
i,j,k running through a loop.
the cube came out as I wanted using merely Array3D.create to create the cube.
The zeroCreate function doesn't initialize the array, so you get values like 0 or null. So this is unsafe (you might get NullReferenceException at run-time if you forget to set a value). In most cases, I recommend you to avoid this function. You shoud use either create (sets the same value for all elements) or init (calls a function on each array cell).
Laurent
I don't know, (yesterday afternoon (F# I do at home)) with create I couldn't figure out how to fill an array with knightjump reachable positions given the position to jump from (the issue at hand).
With zeroCreate the wanted array was easily produced, I reckon the type of the array with create is fixed with the last parameter, while with zeroCreate it is determined at runtime??. It simply works for me, I like C# for its typesafety, and currently haven't a clue how to fix types in F# (the F#-spec 1.9.6, is currently my main source of information, the helps me figuring out F#)
But a week into F# I already knightjump around my cube, yet to figure out how to implement the iteration I promised my friends to do in a functional manner.
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I'm trying to create a grid storing elemements of a type that I've created. For this, I am using the Microsoft.FSharp.Collections.Array2D and the create method...
How can I declare a typed Array2D??