Jerzy suggested:
eulerJ f' dt f0 = map snd (iterate (\(t,f)->(t+dt,f+dt*f' t f)) (0,f0) )
This is nice. Some people prefer list comprehensions over
the use of `map' and `iterate':
eulerK f' dt f0 = fs
where
fs = f0 : [ f+dt*f' t f | (t,f) <- [0,dt..] `zip` fs ]
(Jerzy, you can write this on one line if you want :-)
/Koen.