[Haskell-beginners] How to correctly define data types?

[Brent Yorgey]

On Tue, Jul 19, 2011 at 01:46:19PM -0300, Davi Santos wrote:
> Brent, thanks for answering.
> Sorry, by "set" I meant "access" [the field "attributes"]. But you already
> answered, it depends on the ML module implementation choice.
> 
> One more question about elegance:
> How to make Examples "sortable" by distance to a reference point
> "referenceEx"?

To sort by distance to a given reference point you could use something
like

  import Data.List (sortBy)
  import Data.Ord (comparing)

  ...

  sortedExamples = sortBy (comparing (distance referenceEx)) listExs

-Brent