Finding items satisfying a condition in a list using patterns

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP











up vote
1
down vote

favorite












Why the following command



Cases[1, 2, 6, 3, 4, 8, 5, x_, y_, z_ /; (y > Max[x, z]):>y]


doesn't return the y values that are greater than their neighbors in the list?
I am expecting to have an output like 6,8.






pattern-matching cases







share|improve this question









New contributor




The Legend of 1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.



















  • For this question, I want to know how can I do it using patterns and I am not looking for alternative solutions.
    – The Legend of 1991
    2 hours ago














up vote
1
down vote

favorite












Why the following command



Cases[1, 2, 6, 3, 4, 8, 5, x_, y_, z_ /; (y > Max[x, z]):>y]


doesn't return the y values that are greater than their neighbors in the list?
I am expecting to have an output like 6,8.






pattern-matching cases







share|improve this question









New contributor




The Legend of 1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.



















  • For this question, I want to know how can I do it using patterns and I am not looking for alternative solutions.
    – The Legend of 1991
    2 hours ago












up vote
1
down vote

favorite









up vote
1
down vote

favorite











Why the following command



Cases[1, 2, 6, 3, 4, 8, 5, x_, y_, z_ /; (y > Max[x, z]):>y]


doesn't return the y values that are greater than their neighbors in the list?
I am expecting to have an output like 6,8.






pattern-matching cases







share|improve this question









New contributor




The Legend of 1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











Why the following command



Cases[1, 2, 6, 3, 4, 8, 5, x_, y_, z_ /; (y > Max[x, z]):>y]


doesn't return the y values that are greater than their neighbors in the list?
I am expecting to have an output like 6,8.






pattern-matching cases




pattern-matching cases






share|improve this question









New contributor




The Legend of 1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




The Legend of 1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 2 hours ago









Henrik Schumacher

40.2k255120




40.2k255120






New contributor




The Legend of 1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 2 hours ago









The Legend of 1991

202




202




New contributor




The Legend of 1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





The Legend of 1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






The Legend of 1991 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











  • For this question, I want to know how can I do it using patterns and I am not looking for alternative solutions.
    – The Legend of 1991
    2 hours ago
















  • For this question, I want to know how can I do it using patterns and I am not looking for alternative solutions.
    – The Legend of 1991
    2 hours ago















For this question, I want to know how can I do it using patterns and I am not looking for alternative solutions.
– The Legend of 1991
2 hours ago




For this question, I want to know how can I do it using patterns and I am not looking for alternative solutions.
– The Legend of 1991
2 hours ago










1 Answer
1






active

oldest

votes

















up vote
3
down vote



accepted










There are no Lists of length 3 in the input at level 1. So Cases cannot find anything. However SequenceCases can because it interprets lists as sequences.



SequenceCases[
 1, 2, 6, 3, 4, 8, 5, 
 x_, y_, z_ /; (y > Max[x, z]) :> y, 
 Overlaps -> True
 ]



6, 8







share|improve this answer




















    Your Answer




    StackExchange.ifUsing("editor", function ()
    return StackExchange.using("mathjaxEditing", function ()
    StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
    StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
    );
    );
    , "mathjax-editing");

    StackExchange.ready(function()
    var channelOptions =
    tags: "".split(" "),
    id: "387"
    ;
    initTagRenderer("".split(" "), "".split(" "), channelOptions);

    StackExchange.using("externalEditor", function()
    // Have to fire editor after snippets, if snippets enabled
    if (StackExchange.settings.snippets.snippetsEnabled)
    StackExchange.using("snippets", function()
    createEditor();
    );

    else
    createEditor();

    );

    function createEditor()
    StackExchange.prepareEditor(
    heartbeatType: 'answer',
    convertImagesToLinks: false,
    noModals: false,
    showLowRepImageUploadWarning: true,
    reputationToPostImages: null,
    bindNavPrevention: true,
    postfix: "",
    onDemand: true,
    discardSelector: ".discard-answer"
    ,immediatelyShowMarkdownHelp:true
    );



    );






    The Legend of 1991 is a new contributor. Be nice, and check out our Code of Conduct.









     

    draft saved


    draft discarded


















    StackExchange.ready(
    function ()
    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmathematica.stackexchange.com%2fquestions%2f182901%2ffinding-items-satisfying-a-condition-in-a-list-using-patterns%23new-answer', 'question_page');

    );

    Post as a guest

















    1 Answer
    1






    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    3
    down vote



    accepted










    There are no Lists of length 3 in the input at level 1. So Cases cannot find anything. However SequenceCases can because it interprets lists as sequences.



    SequenceCases[
     1, 2, 6, 3, 4, 8, 5, 
     x_, y_, z_ /; (y > Max[x, z]) :> y, 
     Overlaps -> True
     ]



    6, 8







    share|improve this answer
























      up vote
      3
      down vote



      accepted










      There are no Lists of length 3 in the input at level 1. So Cases cannot find anything. However SequenceCases can because it interprets lists as sequences.



      SequenceCases[
       1, 2, 6, 3, 4, 8, 5, 
       x_, y_, z_ /; (y > Max[x, z]) :> y, 
       Overlaps -> True
       ]



      6, 8







      share|improve this answer






















        up vote
        3
        down vote



        accepted







        up vote
        3
        down vote



        accepted






        There are no Lists of length 3 in the input at level 1. So Cases cannot find anything. However SequenceCases can because it interprets lists as sequences.



        SequenceCases[
         1, 2, 6, 3, 4, 8, 5, 
         x_, y_, z_ /; (y > Max[x, z]) :> y, 
         Overlaps -> True
         ]



        6, 8







        share|improve this answer












        There are no Lists of length 3 in the input at level 1. So Cases cannot find anything. However SequenceCases can because it interprets lists as sequences.



        SequenceCases[
         1, 2, 6, 3, 4, 8, 5, 
         x_, y_, z_ /; (y > Max[x, z]) :> y, 
         Overlaps -> True
         ]



        6, 8








        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 2 hours ago









        Henrik Schumacher

        40.2k255120




        40.2k255120




















            The Legend of 1991 is a new contributor. Be nice, and check out our Code of Conduct.









             

            draft saved


            draft discarded


















            The Legend of 1991 is a new contributor. Be nice, and check out our Code of Conduct.












            The Legend of 1991 is a new contributor. Be nice, and check out our Code of Conduct.











            The Legend of 1991 is a new contributor. Be nice, and check out our Code of Conduct.













             


            draft saved


            draft discarded














            StackExchange.ready(
            function ()
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmathematica.stackexchange.com%2fquestions%2f182901%2ffinding-items-satisfying-a-condition-in-a-list-using-patterns%23new-answer', 'question_page');

            );

            Post as a guest
































































            Comments

            Post a Comment

            Popular posts from this blog

            Long meetings (6-7 hours a day): Being “babysat” by supervisor

            Image
            Clash Royale CLAN TAG #URR8PPP .everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty margin-bottom:0; up vote 31 down vote favorite 4 I hold a PhD in mechanical engineering with a 7 year background in self-guided, self-paced research including 2 years as a graduate level course instructor and a subject matter expert for various engineering projects in a university setting in the United States. For the last 10-11 months, I am working in a research industry in France where my task is to debug C++ spaghetti code written over a period of several years by my current supervisor. It is a team of 2: just I and my supervisor. Diurnally, I am posed with a "bug of the day" to get out of this C++ code. My supervisor generally gives me about 15-30 minutes to solve it and then accosts me about whether or not the task is completed and then rinses and repeats this until the end of the day. Off-late, my supervisor has been holding 6-7 hour long "meetin
            Read more

            Is the Concept of Multiple Fantasy Races Scientifically Flawed? [closed]

            Image
            Clash Royale CLAN TAG #URR8PPP up vote 2 down vote favorite Many fantasy worlds have multiple humanoid species (elves, orcs, humans, etc) living in the same world, in addition to that, they often have the ability to interbreed. And I can't help but question their believability... fantasy-races reproduction interspecies-relations share | improve this question edited Aug 9 at 14:46 Michael Kjörling ♦ 21.1k 10 85 161 asked Aug 9 at 13:13 Chlodio 118 6 closed as unclear what you're asking by MichaelK, Gryphon, John, Vincent, Frostfyre Aug 9 at 15:25 Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question. 3 Stack Exchange exist to
            Read more

            Confectionery

            Image
            Prepared foods made with a lot of sugar or other cabohydrates "Sweetmeat" redirects here. For the racehorse, see Sweetmeat (horse). Not to be confused with Sweetbread. This Kransekake is a traditional Scandinavian baker's confection. Confectionery is the art of making confections , which are food items that are rich in sugar and carbohydrates. Exact definitions are difficult. [1] In general, though, confectionery is divided into two broad and somewhat overlapping categories, bakers' confections and sugar confections. [2] Bakers' confectionery, also called flour confections , includes principally sweet pastries, cakes, and similar baked goods. Sugar confectionery includes candies ( sweets in British English), candied nuts, chocolates, chewing gum, bubble gum, pastillage, and other confections that are made primarily of sugar. In some cases, chocolate confections (confections made of chocolate) are treated as a separate category, as are sugar-free versions of
            Read more