ayrnieu changed the topic of #ocaml to: OCaml 3.08.4 available! Archive of Caml Weekly News: http://sardes.inrialpes.fr/~aschmitt/cwn/ | A free book: http://cristal.inria.fr/~remy/cours/appsem/ | Mailing List: http://caml.inria.fr/bin/wilma/caml-list/ | Cookbook: http://pleac.sourceforge.net/
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<twobitsprite> I'm looking all over the manual, and I can't find a page the outlines all of the arithemtic operations...
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<twobitsprite> how can one fold the * operator? I tried "fold_right ( * ) [3;4];;" but it says "This expression has type 'a list but is here used with type int"
<avlondono> twobitsprite: look at the type of the fold_right function, you're missing part of it. If the list is empty, what should be the result of that fold?
<avlondono> though you probably figured it out long ago
<pnou_> # List.fold_right ( * ) [3;4];;
<pnou_> - : int -> int = <fun>
<pnou_> it works
<twobitsprite> ahh... I was actually using fold_left... fold_right does work... why is that?
<pnou_> look at the type:
<pnou_> # List.fold_left;;
<pnou_> - : ('a -> 'b -> 'a) -> 'a -> 'b list -> 'a = <fun>
<twobitsprite> I see
<pnou_> must write fun x -> List.fold_left ( * ) x [3; 4]
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<twobitsprite> well... now that people are here... maybe you can answer me why "**" is float -> float -> float, and there is nothing for ints?
<twobitsprite> i.e. is there a better way to get the n-power of an int?
<twobitsprite> once again... silence...
<pnou_> i don't think so, you got to write your own function
<twobitsprite> lame...
<pnou_> indeed
<twobitsprite> I've never taken the power of a float before, I always see it done with ints... I just find it odd that a language would not support taking the power of an int...
<pnou_> the standard library is quite poor in my opinion
<twobitsprite> why is that? lack of developers?
<pnou_> no, that's the INRIA policy
<pnou_> standard library with just the essential
<twobitsprite> power of int isn't essential?
<pnou_> i don't agree with them
<pnou_> ask them
<twobitsprite> amd functional programming advocates wonder why thier langauges never gain favor in the industry...
<twobitsprite> the only thing that for Python in the lime-light was it's "Batteries included" motto... developers like large standard libraries
<pnou_> not functional programming, ocaml; that's their private view of what a standard library should be
<pnou_> that's a pity but so it is
<twobitsprite> well... its true of most functional implementations... most of them have pretty shotty support for non-"essentials"
<pnou_> it depends on where you put the edge
<pnou_> in other words, if you compare to perl or if you compare to any mainstreamed compiled language
<pnou_> anyway, time to go sleeping
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<rober> hi
<KAeL> hi
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<avlondono> question about polymorphic types
<avlondono> let f = function #a as x -> x | #b as y -> y
<avlondono> say type a = [`A] and b = [`B]
<avlondono> the type of f is [< `A | `B] -> [>`A | `B]
<avlondono> now I define
<avlondono> let g (x : a) = x
<avlondono> let h (x : b) = x
<avlondono> then the following won't work:
<avlondono> let f = function #a as x -> g x | #b as y -> h y
<avlondono> I understand the constraint of g as the type system assumes the output of the function must be the type of the output of g, but I can't figure what should I tell the compiler to make sure the constraint is not propagated early
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<Schmurtz> g x don't have the same type of h y
<avlondono> I understand that
<Schmurtz> did you try with : let g (x : a) = (x: [>`A | `B])
<Schmurtz> or something like that
<avlondono> I tried several combinations, including that (I think)
<avlondono> let me try again
<avlondono> it's been like an hour so I have tried many things
<Schmurtz> however, I have no experience with `A type, so I can't help very much
<avlondono> thanks anyway
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<avlondono> ok it was in the manual (as usual)
<Schmurtz> lol
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<ax> what does ` do in this case?
<avlondono> it makes the variant type polymorphic
<avlondono> you don't need to declare them and they are not tied to a particular type
<avlondono> the type system checks if you are being consistent in their usage or not
<ax> hmm, i need to read more i guess
<avlondono> in some way it is (at least for me), like types are collections of those polymorphic variants
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<avlondono> ax: it is one of the coolest things I have learned in ocaml
<avlondono> and also very tricky
<ax> yes, i am still rather confused about some things in ocaml, i need to read more deeply and do more exersizes i think
<ax> now that i have some free time i'll be doing that
<avlondono> there is a paper of Jacques Garrigue thaat is quite illustrative about this particular thing
<avlondono> Code Reuse Through Polymorphic Variants
<avlondono> it's on his website
<ax> i'll look that up, thank you
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<Schmurtz> ax, don't worry, many ocaml features are not essential
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