rem gives this:
Prelude> rem 9 8
1
I wanted something like this:
Prelude> nonIntRem 9.1 8
1.0999999999999996
I implemented it like this:
nonIntRem x y = x - (y * (fromIntegral $ truncate (x/y)))
My questions are:
- Does something like this already exist in a standard Haskell library? I'd prefer to use a standard function, and I may have missed it.
- If not, is there a more standard name for this function in other languages? Maybe fmod, but the behavior for negatives in this case is not like mod, but like rem. If there is no standard name, can you think of a better name for this function?
- It seems to work properly, but if you notice a problem with this function, I'd like to know about it.
fmodis C's name for it, sofremseems like a logical extension – luqui Dec 25 '12 at 7:15toIntegeris the only thing preventing the floating point types from being an instance ofIntegral... if you are okay with that hole, maybe just instantiate it and then you can call itrem(implementquotRemand you get all the floating div/mods). – luqui Dec 25 '12 at 7:18