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Multidimensional Arrays from VB.NET to F#
f#vb.netarraysmultidimensional

I have an extensive data analysis library for processing scientific data files. These routines are written in VB.NET and utilize multidimensional arrays in the format of, for example, 8 parameters by 1,000,000.

dim arr(8,1000000) as double

Currently, I'm exploring the use of F# for some kmeans cluster analysis routines. F# seems to like to work with collections as an array, seq or list in a single dimension. Additionally, I can process a pair of arrays with functions like Array.fold2<'T1, 'T2>.

What would be the best oppose for passing in the VB.NET array in a format F# would handle with default types? Of course, I've also looked at the Math.NET package which has DenseMatrix structures. Perhaps this is the way to go.

Any thoughts on a calling signature and data format?

Thanks,
Don

.

Hi,

I haven't worked with numerics a whole lot in F#, but I thought everything available in VB is there in F# as well, perhaps sometimes with less convenient syntax. Here is how to instantiate a 2D 8x10^6 double array:

1
2

let arr : double[,] =
    Array2D.init 8 1000000 (fun x y -> 0.0)

For more than 2/3D the convenience functions aren't there, but the functionality is around in System.Array.

Let us know how F# works out for you in your project!

Thanks,

--A

By on 1/10/2013 12:15 PM ()

Anton,

Thanks for the syntax. It was my fault, I was using angle instead of square brackets. What is really nice, I find, is the "F# Interactive" mode. I will keep the community apprised.

By on 1/11/2013 9:14 AM ()

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