TracePrint does not work as in my book

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











up vote
3
down vote

favorite












I am using Mathematica 11.3



Here is an my execution of code from book "Essentials of Programming in Mathematica" (Fibonacci numbers):



F[1]=1;
F[2]=1;
F[n_]:=F[n-2]+F[n-1]
Table[F[i],i,1,26]



1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181,6765,10946,17711,28657,46368,75025,121393




TracePrint[F[4],F[_Integer]F[_]+F[_]]



3




But instead, the book has:





Question:



Why my I am not getting that step by step execution like in the book when executing TracePrint part?






recursion debugging







share|improve this question



























    up vote
    3
    down vote

    favorite












    I am using Mathematica 11.3



    Here is an my execution of code from book "Essentials of Programming in Mathematica" (Fibonacci numbers):



    F[1]=1;
    F[2]=1;
    F[n_]:=F[n-2]+F[n-1]
    Table[F[i],i,1,26]



    1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181,6765,10946,17711,28657,46368,75025,121393




    TracePrint[F[4],F[_Integer]F[_]+F[_]]



    3




    But instead, the book has:





    Question:



    Why my I am not getting that step by step execution like in the book when executing TracePrint part?






    recursion debugging







    share|improve this question

























      up vote
      3
      down vote

      favorite









      up vote
      3
      down vote

      favorite











      I am using Mathematica 11.3



      Here is an my execution of code from book "Essentials of Programming in Mathematica" (Fibonacci numbers):



      F[1]=1;
      F[2]=1;
      F[n_]:=F[n-2]+F[n-1]
      Table[F[i],i,1,26]



      1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181,6765,10946,17711,28657,46368,75025,121393




      TracePrint[F[4],F[_Integer]F[_]+F[_]]



      3




      But instead, the book has:





      Question:



      Why my I am not getting that step by step execution like in the book when executing TracePrint part?






      recursion debugging







      share|improve this question















      I am using Mathematica 11.3



      Here is an my execution of code from book "Essentials of Programming in Mathematica" (Fibonacci numbers):



      F[1]=1;
      F[2]=1;
      F[n_]:=F[n-2]+F[n-1]
      Table[F[i],i,1,26]



      1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181,6765,10946,17711,28657,46368,75025,121393




      TracePrint[F[4],F[_Integer]F[_]+F[_]]



      3




      But instead, the book has:





      Question:



      Why my I am not getting that step by step execution like in the book when executing TracePrint part?






      recursion debugging




      recursion debugging






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 2 hours ago









      Henrik Schumacher

      39.3k254115




      39.3k254115










      asked 2 hours ago









      vasili111

      31917




      31917




















          1 Answer
          1






          active

          oldest

          votes

















          up vote
          3
          down vote



          accepted










          That's probably a typo in the book. The pattern F[_Integer] F[_] + F[_] does not occur in during the evaluation of F[4].



          The code should look like this (notice the |):



          TracePrint[F[4], F[_Integer] | F[_] + F[_]]





          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
            );



            );













             

            draft saved


            draft discarded


















            StackExchange.ready(
            function ()
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmathematica.stackexchange.com%2fquestions%2f182532%2ftraceprint-does-not-work-as-in-my-book%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










            That's probably a typo in the book. The pattern F[_Integer] F[_] + F[_] does not occur in during the evaluation of F[4].



            The code should look like this (notice the |):



            TracePrint[F[4], F[_Integer] | F[_] + F[_]]





            share|improve this answer
























              up vote
              3
              down vote



              accepted










              That's probably a typo in the book. The pattern F[_Integer] F[_] + F[_] does not occur in during the evaluation of F[4].



              The code should look like this (notice the |):



              TracePrint[F[4], F[_Integer] | F[_] + F[_]]





              share|improve this answer






















                up vote
                3
                down vote



                accepted







                up vote
                3
                down vote



                accepted






                That's probably a typo in the book. The pattern F[_Integer] F[_] + F[_] does not occur in during the evaluation of F[4].



                The code should look like this (notice the |):



                TracePrint[F[4], F[_Integer] | F[_] + F[_]]





                share|improve this answer












                That's probably a typo in the book. The pattern F[_Integer] F[_] + F[_] does not occur in during the evaluation of F[4].



                The code should look like this (notice the |):



                TracePrint[F[4], F[_Integer] | F[_] + F[_]]






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 2 hours ago









                Henrik Schumacher

                39.3k254115




                39.3k254115



























                     

                    draft saved


                    draft discarded















































                     


                    draft saved


                    draft discarded














                    StackExchange.ready(
                    function ()
                    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmathematica.stackexchange.com%2fquestions%2f182532%2ftraceprint-does-not-work-as-in-my-book%23new-answer', 'question_page');

                    );

                    Post as a guest
































































                    Comments

                    Post a Comment

                    Popular posts from this blog

                    What does second last employer means? [closed]

                    Image
                    Clash Royale CLAN TAG #URR8PPP .everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty margin-bottom:0; up vote -3 down vote favorite Say, for example I have worked in the following companies, Company A => 2010 - 2011 Company B => 2011 - 2012 Company C => 2012 - Till Date Company D => Have offer Now assume Company D is asking to submit documents from my second last employer. So from the list of companies given, which company would be qualified as second last employer? software-industry employer share | improve this question asked Aug 10 '14 at 5:16 Rajaprabhu Aravindasamy 559 1 6 13 closed as off-topic by Jim G., jmort253 ♦ Aug 11 '14 at 1:58 This question appears to be off-topic. The users who voted to close gave this specific reason: "Questions seeking advice on company-specific regulations, agreements, or policies should be directed to your manager or HR department. Questions that address...
                    Read more

                    List of Gilmore Girls characters

                    Image
                    The season three cast—(Back row): Lane, Michel, Paris, Emily, Richard, Sookie, Miss Patty, Kirk; Front row: Jess, Luke, Lorelai, Rory, Dean This is a list of characters for the comedy-drama television series Gilmore Girls . Contents 1 Main characters 1.1 Lorelai Gilmore 1.2 Rory Gilmore 1.3 Sookie St. James 1.4 Lane Kim 1.5 Michel Gerard 1.6 Luke Danes 1.7 Emily Gilmore 1.8 Richard Gilmore 1.9 Paris Geller 1.10 Dean Forester 1.11 Jess Mariano 1.12 Kirk Gleason 1.13 Jason Stiles 1.14 Logan Huntzberger 2 Major recurring characters 2.1 Christopher Hayden 2.2 Jackson Belleville 2.3 Mrs. Kim 2.4 Tristin DuGray 2.5 Max Medina 2.6 Taylor Doose 2.7 Dave Rygalski 2.8 Marty 3 Recurring characters 3.1 Stars Hollow 3.2 Chilton 3.3 Yale 3.4 Other 4 Notable guest stars 5 Unseen characters 6 Notes 7 References Main characters Actor Character Appearances Season 1 Season 2 Season 3 Season 4 Season 5 Season 6 Season 7 A Year in the Life Lauren Graham Lorelai Gilmore...
                    Read more

                    One-line joke

                    A one-liner is a joke that is delivered in a single line. A good one-liner is said to be pithy - concise and meaningful. [1] Comedians and actors use this comedic method as part of their act, e.g. Jimmy Carr, Tommy Cooper, Rodney Dangerfield, Norm Macdonald, Ken Dodd, Stewart Francis, Zach Galifianakis, Mitch Hedberg, Anthony Jeselnik, Milton Jones, Shappi Khorsandi, Jay London, Mark Linn-Baker, Demetri Martin, Groucho Marx, Dan Mintz, Emo Philips, Tim Vine, Steven Wright and Henny Youngman and Arnold Schwarzenegger. [ citation needed ] Many fictional characters are also known to deliver one-liners, including James Bond, who usually includes pithy and laconic quips after disposing of a villain. [ citation needed ] Examples "A baby seal walks into a club." "A dyslexic man walks into a bra." (Anonymous) "There are three types of people, those who can count and those who can't." "Venison's dear, isn't it?" (Jimmy Carr) "An escala...
                    Read more