Problems with rounding giving too many digits












1












$begingroup$


My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round







share|improve this question











$endgroup$












  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    3 hours ago






  • 1




    $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    3 hours ago
















1












$begingroup$


My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round







share|improve this question











$endgroup$












  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    3 hours ago






  • 1




    $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    3 hours ago














1












1








1





$begingroup$


My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round







share|improve this question











$endgroup$




My current code is:



round = .1;

f[x_] := x + 4 - Sqrt[3 x^2 - 5]

xx = Solve[f[x] == 0, Reals];

StringForm["x=`1`", 

If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round], 

"none"]]



x=5.800000000000001`




which i want to give me an output of "x = 5.8" instead.



Any advice would be appreciated.






formatting round




formatting round






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 3 hours ago









Alexey Popkov

38.5k4108263




38.5k4108263










asked 4 hours ago









WomblesWombles

584




584












  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    3 hours ago






  • 1




    $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    3 hours ago


















  • $begingroup$
    StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
    $endgroup$
    – Bob Hanlon
    3 hours ago






  • 1




    $begingroup$
    Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
    $endgroup$
    – Daniel Lichtblau
    3 hours ago
















$begingroup$
StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
$endgroup$
– Bob Hanlon
3 hours ago




$begingroup$
StringForm["x=1", If[Length[xx] >= 1, Round[Max[xx[[All, 1, 2]]], round // Rationalize] // N, "none"]]
$endgroup$
– Bob Hanlon
3 hours ago




1




1




$begingroup$
Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
$endgroup$
– Daniel Lichtblau
3 hours ago




$begingroup$
Could round exactly and then use N: N[Round[Max[xx[[All, 1, 2]]], 1/10]]
$endgroup$
– Daniel Lichtblau
3 hours ago










3 Answers
3






active

oldest

votes


















3












$begingroup$

You could add a StandardForm wrapper:



StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



x=5.8







share|improve this answer









$endgroup$













  • $begingroup$
    Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
    $endgroup$
    – Wombles
    3 hours ago



















3












$begingroup$

StringForm["x=`1`", If[Length[xx] >= 1, 

  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 

  "none"]]



x = 5.8




Same result with NumberForm in place of DecimalForm.






share|improve this answer











$endgroup$













  • $begingroup$
    Thank you, this worked great
    $endgroup$
    – Wombles
    2 hours ago



















1












$begingroup$

StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]



x = 5.8







share|improve this answer









$endgroup$













    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',
    autoActivateHeartbeat: false,
    convertImagesToLinks: false,
    noModals: true,
    showLowRepImageUploadWarning: true,
    reputationToPostImages: null,
    bindNavPrevention: true,
    postfix: "",
    imageUploader: {
    brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
    contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
    allowUrls: true
    },
    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%2f192843%2fproblems-with-rounding-giving-too-many-digits%23new-answer', 'question_page');
    }
    );

    Post as a guest















    Required, but never shown

























    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    3












    $begingroup$

    You could add a StandardForm wrapper:



    StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



    x=5.8







    share|improve this answer









    $endgroup$













    • $begingroup$
      Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
      $endgroup$
      – Wombles
      3 hours ago
















    3












    $begingroup$

    You could add a StandardForm wrapper:



    StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



    x=5.8







    share|improve this answer









    $endgroup$













    • $begingroup$
      Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
      $endgroup$
      – Wombles
      3 hours ago














    3












    3








    3





    $begingroup$

    You could add a StandardForm wrapper:



    StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



    x=5.8







    share|improve this answer









    $endgroup$



    You could add a StandardForm wrapper:



    StringForm["x=`1`",StandardForm @ If[Length[xx]>=1,Round[Max[xx[[All,1,2]]],round],"none"]]



    x=5.8








    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 3 hours ago









    Carl WollCarl Woll

    69.4k393179




    69.4k393179












    • $begingroup$
      Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
      $endgroup$
      – Wombles
      3 hours ago


















    • $begingroup$
      Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
      $endgroup$
      – Wombles
      3 hours ago
















    $begingroup$
    Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
    $endgroup$
    – Wombles
    3 hours ago




    $begingroup$
    Thank you! that worked and i have no idea why, i'll read the documentation for standardForm
    $endgroup$
    – Wombles
    3 hours ago











    3












    $begingroup$

    StringForm["x=`1`", If[Length[xx] >= 1, 
    
  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 
    
  "none"]]



    x = 5.8




    Same result with NumberForm in place of DecimalForm.






    share|improve this answer











    $endgroup$













    • $begingroup$
      Thank you, this worked great
      $endgroup$
      – Wombles
      2 hours ago
















    3












    $begingroup$

    StringForm["x=`1`", If[Length[xx] >= 1, 
    
  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 
    
  "none"]]



    x = 5.8




    Same result with NumberForm in place of DecimalForm.






    share|improve this answer











    $endgroup$













    • $begingroup$
      Thank you, this worked great
      $endgroup$
      – Wombles
      2 hours ago














    3












    3








    3





    $begingroup$

    StringForm["x=`1`", If[Length[xx] >= 1, 
    
  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 
    
  "none"]]



    x = 5.8




    Same result with NumberForm in place of DecimalForm.






    share|improve this answer











    $endgroup$



    StringForm["x=`1`", If[Length[xx] >= 1, 
    
  DecimalForm[Round[Max[xx[[All, 1, 2]]], round], DefaultPrintPrecision -> 2], 
    
  "none"]]



    x = 5.8




    Same result with NumberForm in place of DecimalForm.







    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited 3 hours ago

























    answered 3 hours ago









    kglrkglr

    187k10203421




    187k10203421












    • $begingroup$
      Thank you, this worked great
      $endgroup$
      – Wombles
      2 hours ago


















    • $begingroup$
      Thank you, this worked great
      $endgroup$
      – Wombles
      2 hours ago
















    $begingroup$
    Thank you, this worked great
    $endgroup$
    – Wombles
    2 hours ago




    $begingroup$
    Thank you, this worked great
    $endgroup$
    – Wombles
    2 hours ago











    1












    $begingroup$

    StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]



    x = 5.8







    share|improve this answer









    $endgroup$


















      1












      $begingroup$

      StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]



      x = 5.8







      share|improve this answer









      $endgroup$
















        1












        1








        1





        $begingroup$

        StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]



        x = 5.8







        share|improve this answer









        $endgroup$



        StringJoin["x=",If[Length[xx] >= 1, ToString[Round[Max[xx[[All, 1, 2]]]*10]/10.]]



        x = 5.8








        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 3 hours ago









        mjwmjw

        5328




        5328






























            draft saved

            draft discarded




















































            Thanks for contributing an answer to Mathematica Stack Exchange!


            • Please be sure to answer the question. Provide details and share your research!

            But avoid …



            • Asking for help, clarification, or responding to other answers.

            • Making statements based on opinion; back them up with references or personal experience.


            Use MathJax to format equations. MathJax reference.


            To learn more, see our tips on writing great answers.




            draft saved


            draft discarded














            StackExchange.ready(
            function () {
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmathematica.stackexchange.com%2fquestions%2f192843%2fproblems-with-rounding-giving-too-many-digits%23new-answer', 'question_page');
            }
            );

            Post as a guest















            Required, but never shown





















































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown

































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown







            -

            Popular posts from this blog

            Сан-Квентин

            Image
            Сан-Квентин Местоположение Сан-Квентин, Калифорния Координаты 37°56′13″ с. ш. 122°29′20″ з. д. H G Я O L Текущий статус Действует Режим безопасности минимальный и максимальный Количество мест 3 302 Открытие Июнь 1852 Находится в ведомстве California Department of Corrections and Rehabilitation Начальник Mike Martel, начальник  Сан-Квентин на Викискладе Сан-Квентин (англ.  San Quentin ) — тюрьма, располагающаяся на 432 акрах (около 1,7 км²), на мысе Сан-Квентин, в округе Марин, штат Калифорния, США. Тюрьма штата Калифорния Сан-Квентин была открыта в июле 1852 года и является старейшей в штате. Она была построена заключёнными, которые проживали в течение строительства на тюремном судне Вабан. В Сан-Квентине отбывали наказание и мужчины, и женщины до 1934 года, когда построили женскую тюрьму в Техачапи и туда перевели всех заключённых женщин. В Сан-Квентине приводятся в исполнение смертные казни, для этого имеется газовая камера, но
            Read more

            Алькесар

            Image
            Муниципалитет Алькесар Alquézar Герб 42°10′16″ с. ш. 0°01′27″ в. д. H G Я O L Страна Испания   Испания Автономное сообщество Арагон Провинция Уэска Комарка Сомонтано-де-Барбастро Алькальд Хосе Марияно Альтемир Ласкорс (ИСРП) История и география Площадь 32,36 км² Высота НУМ 660 м Часовой пояс UTC+1, летом UTC+2 Население Население 313 человек ( 2010 ) Плотность 9,92 чел./км² Этнохороним alquezarano/-a Цифровые идентификаторы Телефонный код +34 974 Почтовые индексы 22112 Автомобильный код HU alquezar.org   (исп.) Показать/скрыть карты Алькесар Алькесар Алькесар  Аудио, фото и видео на Викискладе Алькесар (исп.  Alquézar ) — муниципалитет в Испании, входит в провинцию Уэска, в составе автономного сообщества Арагон. Муниципалитет находится в составе района (комарки) Сомонтано-де-Барбастро. Занимает площадь 32,36 км². Население — 321 челове
            Read more

            Josef Freinademetz

            Image
            San Ujöp (Giuseppe/Josef) Freinademetz Josef Freinademetz in abiti cinesi   Religioso e missionario   Nascita 15 aprile 1852 Morte 28 gennaio 1908 Venerato da Chiesa cattolica Beatificazione 1975 Canonizzazione 5 ottobre 2003 Ricorrenza 28 gennaio Manuale Ujöp Freinademetz noto anche come Giuseppe o Josef Freinademetz (Oies, 15 aprile 1852 – Taikia, 28 gennaio 1908) è stato un presbitero austriaco, membro della Società del Verbo Divino, fu missionario in Cina; è venerato come santo dalla Chiesa cattolica. .mw-parser-output .citazione-table{margin-bottom:.5em;font-size:95%}.mw-parser-output .citazione-table td{padding:0 1.2em 0 2.4em}.mw-parser-output .citazione-lang{vertical-align:top}.mw-parser-output .citazione-lang td{width:50%}.mw-parser-output .citazione-lang td:first-child{padding:0 0 0 2.4em}.mw-parser-output .citazione-lang td:nth-child(2){padding:0 1.2em} «Io amo la Cina e i cinesi; voglio morire in mezzo a loro, e tra loro
            Read more