Hi Longesh
But I've found learning Haskell so tough (this is my 4th try in the last two years) that I feel I have to bore everyone with my first non-trivial program.
Well done on getting something going!
my_sqrt t = last (take 20 (iterate (\n -> n/2 + t/(2 * n)) t))
last (take 20) can be reexpressed as:
my_sqrt t = iterate (\n -> n/2 + t/(2 * n)) t !! 19
For information on what !! does (vs last and take), see Hoogle: http://haskell.org/hoogle
It is a bit crude though. 20 iterations is a bit arbitrary. I don't suppose there is a easy way to iterate until the results stop changing.
close (x:y:xs) | abs (x - y) < 0.1 = y close (x:xs) = close xs I don't know how to add it into the one liner though - although I suspect someone here will :) Thanks Neil