Question

When importing numbers from a csv file, I need to convert them to floats with unit.

Currently I do this with an inline function:

data |> List.map float |> List.map (fun n -> n * 1.0<m>) 

But I’m wondering if there is a more elegant way to do this – or do I have to create my own ‘units’ module with conversion functions?

What would be really nice would be something like this, but I doubt it’s possible…

data |> List.map float |> List.map lift<m> 

This is the opposite of my previous question (How to generically remove F# Units of measure).

UPDATE: For homemade units, I’ve tried this, which works ok:

[<Measure>] type km =      static member lift (v:float) = v * 1.0<km>  data |> List.map float |> List.map km.lift 

or, following the question in this answer

data |> List.map (float >> km.lift) 

Answer 1

It looks like units of measure can’t be type parameters for the moment (no idea if this will change). So the shortest way to write this is:

data |> List.map float |> List.map ((*) 1.0<m>) 

EDIT

See also now FloatWithMeasure here

http://msdn.microsoft.com/en-us/library/ee806527(VS.100).aspx