Kenneth Hoste ha scritto:
Hello,
I'm having a go at the Netflix Prize using Haskell. Yes, I'm brave.
[...] To see if I could efficiently represent the data set in this way, I wrote a small Haskell program (attached) which uses the following data type:
From what I see, to append a new integer to the Array, you convert the array to a list, append the new element to the list, and then convert to array again. Isn't this a bit inefficient? The uvector package implements a vector of unboxed types, and has an snocU operation, to append an element to the array. I don't know how efficient it is, however. By the way, about uvector: it has a Stream data type, and you can build a vector from a stream. But how this work and how (if any) the stream data is integrated with other packages? The package documentations seems to be still incomplete.
[...]
Regards Manlio Perillo