sponge45 changed the topic of #ocaml to: Discussions about the OCaml programming language | http://caml.inria.fr/
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<datrus_> hello. can anyone please tell me why why this doesnt work:
<datrus_> List.fold_right (fun (a,b)->a+b) [1,2,3] 4;;
<datrus_> This expression has type int but is here used with type 'a -> 'a
<hcarty> datrus_: Are you trying to use: List.fold_right (fun a b -> a + b) [1;2;3] 4;;
<datrus_> yes , thanks, that was the error
<hcarty> You're welcome
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<postalchris> Am I crazy, or is there no easy way to convert from Int32 to Num?
<malc_> postalchris: you are not crazy
<postalchris> Well that stinks!
<postalchris> Anybody have code for the hard way already?
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<malc_> Int32 -> float -> Num, Int32 -> int -> Num, Int32 -> string -> Num
<malc_> pick your poison
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<postalchris> I may try to avoid Int32 altogether.
<postalchris> Only Int32->string->Num avoids potential precision loss...
<postalchris> No, that's not right... a float can handle an Int32, right?
<malc_> float is (IEEE) double in disguise so i would guess so
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<vorago> Is it normal to escape loops/recursions with exceptions?
<vorago> Does it generate unnecessary overhead?
<malc_> i wouldn't call it normal, yet Pervasives defines an exception Exit, so there are situations where it's being used
<malc_> yes there's overhead, both space/time
<malc_> small though
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<love-pingoo> vorago: espacing loops/recursions is faster
<love-pingoo> you immediately jump back to the exception handler without unwinding every recursive call
<vorago> malc_, love-pingoo thanks.
<hcarty> love-pingoo:Sorry if I misunderstand - are you saying exceptions are faster?
<love-pingoo> I am.
<hcarty> Cool, thanks
<love-pingoo> At least for a deep enough recursion.
<love-pingoo> (Of course one has to take care not to install an exception handler at every recursive call..)
<vorago> (I've learned basics of ocaml last week and I start to love it. Therefore i'll hang around for a bit...)
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