http://perception.inf.um.es/~aruiz/darcs/hmatrix/doc/html/Data-Packed-Vector... provided by hmatrix On Sat, May 31, 2008 at 3:20 PM, Thomas Hartman wrote:

what package do you install/import to get at Vector?

2008/5/31 Thomas Hartman :

...

what package do you install/import to get at Vector?

2008/5/31 Anatoly Yakovenko :

...

What is the most efficient way to update a position in a matrix or a vector? I came up with this:

updateVector :: Vector Double -> Int -> Double -> Vector Double updateVector vec pos val = vec `add` v2 where v2 = fromList $ (replicate (pos) 0.0) ++ ((val - (vec @> pos)):(replicate ((dim vec)- pos - 1) 0.0))

but this seems pretty inefficient to me.

thanks, Anatoly _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe