loop through the list...
hi again... :) Ok assume i got this list of tuples [(10,1),(20,2),(30,3)] where i in (i,j) is a index, i want to go through the list and add a number witch matches the best index. Like 18 should give me [(10,1),(20,3),(30,3)] since 18 are over 10 and under 20... aky? something like [if (thenumber index) then (index,int+1) \and break\ else (index,int) | (index,int) - [thelist]] My problem is that i dont know how to do the break thing! next time the value gonna be smaller than the 30 and ++ the int. Can i use some help-boolean to set it false when we have counted up once? and include that one in the if-stmt?? How do i do that? I guess your laughing your pants wet right now coz there are of-corz some smart built-in functions in haskell to do this kind of silly ting, so please tell me! :) Respect the rock! //Fredde ___ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
Re: loop through the list...
Fredrik Petersson [EMAIL PROTECTED] writes: something like [if (thenumber index) then (index,int+1) \and break\ else (index,int) | (index,int) - [thelist]] I think you need to write an explicit recursion, instead of using a list comprehension. Can i use some help-boolean to set it false when we have counted up once? Using a fold(r|l) would be similar, but I think you'd be better advised at this point to write the recursion explicitly. -kzm -- If I haven't seen further, it is by standing in the footprints of giants ___ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
SV: loop through the list...
Sure it is! Our book sux, and a hate sitting for hour after hour with the same sucking problem. Sometimes you need a hint to get on... Like I think you need to write an explicit recursion are a nice hits which i guess would lead me to the right path again. //FRedde -Ursprungligt meddelande- Från: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Lennart Augustsson Skickat: den 11 augusti 2003 01:03 Till: Fredrik Petersson Kopia: [EMAIL PROTECTED] Ämne: Re: loop through the list... This really sounds a lot like home work. :) -- Lennart Fredrik Petersson wrote: hi again... :) Ok assume i got this list of tuples [(10,1),(20,2),(30,3)] where i in (i,j) is a index, i want to go through the list and add a number witch matches the best index. Like 18 should give me [(10,1),(20,3),(30,3)] since 18 are over 10 and under 20... aky? something like [if (thenumber index) then (index,int+1) \and break\ else (index,int) | (index,int) - [thelist]] My problem is that i dont know how to do the break thing! next time the value gonna be smaller than the 30 and ++ the int. Can i use some help-boolean to set it false when we have counted up once? and include that one in the if-stmt?? How do i do that? I guess your laughing your pants wet right now coz there are of-corz some smart built-in functions in haskell to do this kind of silly ting, so please tell me! :) Respect the rock! //Fredde ___ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell ___ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell ___ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
Re: loop through the list...
This really sounds a lot like home work. :) -- Lennart Fredrik Petersson wrote: hi again... :) Ok assume i got this list of tuples [(10,1),(20,2),(30,3)] where i in (i,j) is a index, i want to go through the list and add a number witch matches the best index. Like 18 should give me [(10,1),(20,3),(30,3)] since 18 are over 10 and under 20... aky? something like [if (thenumber index) then (index,int+1) \and break\ else (index,int) | (index,int) - [thelist]] My problem is that i dont know how to do the break thing! next time the value gonna be smaller than the 30 and ++ the int. Can i use some help-boolean to set it false when we have counted up once? and include that one in the if-stmt?? How do i do that? I guess your laughing your pants wet right now coz there are of-corz some smart built-in functions in haskell to do this kind of silly ting, so please tell me! :) Respect the rock! //Fredde ___ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell ___ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
