Accessing certain elements of tuples











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I have to solve a problem for university studies. So what I want basically is that I want to access certain elements two 2-tuples. I already defined a function:



taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer


as you can see the function takes two 2-tuples containing integers and returns a integer.
And now I have to add the first elements of both tuples and 2nd of both. And I don't now how to access these values which were put in by a user before.



Thank you for your help.






haskell tuples element







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  • if you're adding the first and second elements you're probably doing the computations wrong.
    – karakfa
    Nov 7 at 17:24















up vote
0
down vote

favorite












I have to solve a problem for university studies. So what I want basically is that I want to access certain elements two 2-tuples. I already defined a function:



taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer


as you can see the function takes two 2-tuples containing integers and returns a integer.
And now I have to add the first elements of both tuples and 2nd of both. And I don't now how to access these values which were put in by a user before.



Thank you for your help.






haskell tuples element







share|improve this question






















  • if you're adding the first and second elements you're probably doing the computations wrong.
    – karakfa
    Nov 7 at 17:24













up vote
0
down vote

favorite









up vote
0
down vote

favorite











I have to solve a problem for university studies. So what I want basically is that I want to access certain elements two 2-tuples. I already defined a function:



taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer


as you can see the function takes two 2-tuples containing integers and returns a integer.
And now I have to add the first elements of both tuples and 2nd of both. And I don't now how to access these values which were put in by a user before.



Thank you for your help.






haskell tuples element







share|improve this question













I have to solve a problem for university studies. So what I want basically is that I want to access certain elements two 2-tuples. I already defined a function:



taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer


as you can see the function takes two 2-tuples containing integers and returns a integer.
And now I have to add the first elements of both tuples and 2nd of both. And I don't now how to access these values which were put in by a user before.



Thank you for your help.






haskell tuples element




haskell tuples element






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 7 at 16:58









Mathmeeeeen

111




111












  • if you're adding the first and second elements you're probably doing the computations wrong.
    – karakfa
    Nov 7 at 17:24


















  • if you're adding the first and second elements you're probably doing the computations wrong.
    – karakfa
    Nov 7 at 17:24
















if you're adding the first and second elements you're probably doing the computations wrong.
– karakfa
Nov 7 at 17:24




if you're adding the first and second elements you're probably doing the computations wrong.
– karakfa
Nov 7 at 17:24












2 Answers
2






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up vote
4
down vote













you can use the functions fst + snd like this:



taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer

taxiDistance x y = fst x + fst y


or alternatively you can deconstruct the tuples in the declaration like:



taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer

taxiDistance (a,b) (c,d) = a + b + c + d





share|improve this answer





















  • damn I ruthless just came out with the answer!! sorry :S
    – cmdv
    Nov 7 at 17:20










  • I think this is fine, I don't see how it's pedagogically helpful not to reveal the syntax of what they're trying to do. There's nothing to "think through" here.
    – luqui
    Nov 7 at 19:58










  • This is fine as it is. You didn't solve the full task of the OP: the OP also needs to compute the taxi distance, and that will involve a (slightly) more complex formula. Revealing "how to access the pair components" is perfectly OK, since you can find it on books anyway. What is usually frowned upon (IMO) is to answer a much more broad question dumping the full solution, without a careful explanation. Doing that would only allow the OP to copy&paste their homework, with no chance of actually learning anything. But you didn't do that :)
    – chi
    Nov 7 at 21:52


















up vote
1
down vote













Since this is university studies I won't give the entire answer right away but will point you to read up on pattern matching and tuple constructor.






share|improve this answer





















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    2 Answers
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    2 Answers
    2






    active

    oldest

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    active

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    up vote
    4
    down vote













    you can use the functions fst + snd like this:



    taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer
    
taxiDistance x y = fst x + fst y


    or alternatively you can deconstruct the tuples in the declaration like:



    taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer
    
taxiDistance (a,b) (c,d) = a + b + c + d





    share|improve this answer





















    • damn I ruthless just came out with the answer!! sorry :S
      – cmdv
      Nov 7 at 17:20










    • I think this is fine, I don't see how it's pedagogically helpful not to reveal the syntax of what they're trying to do. There's nothing to "think through" here.
      – luqui
      Nov 7 at 19:58










    • This is fine as it is. You didn't solve the full task of the OP: the OP also needs to compute the taxi distance, and that will involve a (slightly) more complex formula. Revealing "how to access the pair components" is perfectly OK, since you can find it on books anyway. What is usually frowned upon (IMO) is to answer a much more broad question dumping the full solution, without a careful explanation. Doing that would only allow the OP to copy&paste their homework, with no chance of actually learning anything. But you didn't do that :)
      – chi
      Nov 7 at 21:52















    up vote
    4
    down vote













    you can use the functions fst + snd like this:



    taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer
    
taxiDistance x y = fst x + fst y


    or alternatively you can deconstruct the tuples in the declaration like:



    taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer
    
taxiDistance (a,b) (c,d) = a + b + c + d





    share|improve this answer





















    • damn I ruthless just came out with the answer!! sorry :S
      – cmdv
      Nov 7 at 17:20










    • I think this is fine, I don't see how it's pedagogically helpful not to reveal the syntax of what they're trying to do. There's nothing to "think through" here.
      – luqui
      Nov 7 at 19:58










    • This is fine as it is. You didn't solve the full task of the OP: the OP also needs to compute the taxi distance, and that will involve a (slightly) more complex formula. Revealing "how to access the pair components" is perfectly OK, since you can find it on books anyway. What is usually frowned upon (IMO) is to answer a much more broad question dumping the full solution, without a careful explanation. Doing that would only allow the OP to copy&paste their homework, with no chance of actually learning anything. But you didn't do that :)
      – chi
      Nov 7 at 21:52













    up vote
    4
    down vote










    up vote
    4
    down vote









    you can use the functions fst + snd like this:



    taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer
    
taxiDistance x y = fst x + fst y


    or alternatively you can deconstruct the tuples in the declaration like:



    taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer
    
taxiDistance (a,b) (c,d) = a + b + c + d





    share|improve this answer












    you can use the functions fst + snd like this:



    taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer
    
taxiDistance x y = fst x + fst y


    or alternatively you can deconstruct the tuples in the declaration like:



    taxiDistance :: (Integer, Integer) -> (Integer, Integer) -> Integer
    
taxiDistance (a,b) (c,d) = a + b + c + d






    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered Nov 7 at 17:07









    cmdv

    8841919




    8841919












    • damn I ruthless just came out with the answer!! sorry :S
      – cmdv
      Nov 7 at 17:20










    • I think this is fine, I don't see how it's pedagogically helpful not to reveal the syntax of what they're trying to do. There's nothing to "think through" here.
      – luqui
      Nov 7 at 19:58










    • This is fine as it is. You didn't solve the full task of the OP: the OP also needs to compute the taxi distance, and that will involve a (slightly) more complex formula. Revealing "how to access the pair components" is perfectly OK, since you can find it on books anyway. What is usually frowned upon (IMO) is to answer a much more broad question dumping the full solution, without a careful explanation. Doing that would only allow the OP to copy&paste their homework, with no chance of actually learning anything. But you didn't do that :)
      – chi
      Nov 7 at 21:52


















    • damn I ruthless just came out with the answer!! sorry :S
      – cmdv
      Nov 7 at 17:20










    • I think this is fine, I don't see how it's pedagogically helpful not to reveal the syntax of what they're trying to do. There's nothing to "think through" here.
      – luqui
      Nov 7 at 19:58










    • This is fine as it is. You didn't solve the full task of the OP: the OP also needs to compute the taxi distance, and that will involve a (slightly) more complex formula. Revealing "how to access the pair components" is perfectly OK, since you can find it on books anyway. What is usually frowned upon (IMO) is to answer a much more broad question dumping the full solution, without a careful explanation. Doing that would only allow the OP to copy&paste their homework, with no chance of actually learning anything. But you didn't do that :)
      – chi
      Nov 7 at 21:52
















    damn I ruthless just came out with the answer!! sorry :S
    – cmdv
    Nov 7 at 17:20




    damn I ruthless just came out with the answer!! sorry :S
    – cmdv
    Nov 7 at 17:20












    I think this is fine, I don't see how it's pedagogically helpful not to reveal the syntax of what they're trying to do. There's nothing to "think through" here.
    – luqui
    Nov 7 at 19:58




    I think this is fine, I don't see how it's pedagogically helpful not to reveal the syntax of what they're trying to do. There's nothing to "think through" here.
    – luqui
    Nov 7 at 19:58












    This is fine as it is. You didn't solve the full task of the OP: the OP also needs to compute the taxi distance, and that will involve a (slightly) more complex formula. Revealing "how to access the pair components" is perfectly OK, since you can find it on books anyway. What is usually frowned upon (IMO) is to answer a much more broad question dumping the full solution, without a careful explanation. Doing that would only allow the OP to copy&paste their homework, with no chance of actually learning anything. But you didn't do that :)
    – chi
    Nov 7 at 21:52




    This is fine as it is. You didn't solve the full task of the OP: the OP also needs to compute the taxi distance, and that will involve a (slightly) more complex formula. Revealing "how to access the pair components" is perfectly OK, since you can find it on books anyway. What is usually frowned upon (IMO) is to answer a much more broad question dumping the full solution, without a careful explanation. Doing that would only allow the OP to copy&paste their homework, with no chance of actually learning anything. But you didn't do that :)
    – chi
    Nov 7 at 21:52












    up vote
    1
    down vote













    Since this is university studies I won't give the entire answer right away but will point you to read up on pattern matching and tuple constructor.






    share|improve this answer

























      up vote
      1
      down vote













      Since this is university studies I won't give the entire answer right away but will point you to read up on pattern matching and tuple constructor.






      share|improve this answer























        up vote
        1
        down vote










        up vote
        1
        down vote









        Since this is university studies I won't give the entire answer right away but will point you to read up on pattern matching and tuple constructor.






        share|improve this answer












        Since this is university studies I won't give the entire answer right away but will point you to read up on pattern matching and tuple constructor.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 7 at 17:06









        tejasbubane

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