Display elementary math without evaluating











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3
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Given a list of operators and integers, for instance



oper = {Subtract, Times, Plus}
{a, b, c, d} = {3, 5, 4, 9}


I would like to print



oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}]


as $(3-5)times (4+9)$ (set aside the $LaTeX$ formatting, I just mean the numbers and the operators in a classical way). Whenever I use Hold, Unevaluate or Inactivate, the oper[[2]] and similar are not evaluated. Also the operator names are not replaced with their symbols.



Any hints?










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  • For the purpose of displaying, consider strings.
    – Αλέξανδρος Ζεγγ
    Nov 29 at 0:59

















up vote
3
down vote

favorite












Given a list of operators and integers, for instance



oper = {Subtract, Times, Plus}
{a, b, c, d} = {3, 5, 4, 9}


I would like to print



oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}]


as $(3-5)times (4+9)$ (set aside the $LaTeX$ formatting, I just mean the numbers and the operators in a classical way). Whenever I use Hold, Unevaluate or Inactivate, the oper[[2]] and similar are not evaluated. Also the operator names are not replaced with their symbols.



Any hints?










share|improve this question






















  • For the purpose of displaying, consider strings.
    – Αλέξανδρος Ζεγγ
    Nov 29 at 0:59















up vote
3
down vote

favorite









up vote
3
down vote

favorite











Given a list of operators and integers, for instance



oper = {Subtract, Times, Plus}
{a, b, c, d} = {3, 5, 4, 9}


I would like to print



oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}]


as $(3-5)times (4+9)$ (set aside the $LaTeX$ formatting, I just mean the numbers and the operators in a classical way). Whenever I use Hold, Unevaluate or Inactivate, the oper[[2]] and similar are not evaluated. Also the operator names are not replaced with their symbols.



Any hints?










share|improve this question













Given a list of operators and integers, for instance



oper = {Subtract, Times, Plus}
{a, b, c, d} = {3, 5, 4, 9}


I would like to print



oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}]


as $(3-5)times (4+9)$ (set aside the $LaTeX$ formatting, I just mean the numbers and the operators in a classical way). Whenever I use Hold, Unevaluate or Inactivate, the oper[[2]] and similar are not evaluated. Also the operator names are not replaced with their symbols.



Any hints?







hold display






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asked Nov 28 at 21:50









anderstood

7,7441858




7,7441858












  • For the purpose of displaying, consider strings.
    – Αλέξανδρος Ζεγγ
    Nov 29 at 0:59




















  • For the purpose of displaying, consider strings.
    – Αλέξανδρος Ζεγγ
    Nov 29 at 0:59


















For the purpose of displaying, consider strings.
– Αλέξανδρος Ζεγγ
Nov 29 at 0:59






For the purpose of displaying, consider strings.
– Αλέξανδρος Ζεγγ
Nov 29 at 0:59












2 Answers
2






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up vote
6
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ClearAll[a, b, c, d, oper]
oper = {Subtract, Inactive@Times, Inactive@Plus} /.
Subtract -> (HoldForm[Plus[#, -#2]] &);
{a, b, c, d} = {3, 5, 4, 9};
oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}]


enter image description here






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    up vote
    1
    down vote













    (3 - 5)*(4 + 9) // Inactivate


    $(3 {color{#b39980}+}{text{ -}5})*(4 {color{#b39980}+} 9)$



    If you only want to inactivate the heads that appear in oper while others occur:



    hold = Function[e, Unevaluated[e] /. HoldPattern[oper[[a_]]] :>
    Inactive[Evaluate[oper[[a]]]], HoldAllComplete];

    oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}] // hold


    ${color{#b39980}Scolor{#b39980}ucolor{#b39980}bcolor{#b39980}tcolor{#b39980}rcolor{#b39980}acolor{#b39980}ccolor{#b39980}t}[3,5]{ color{#b39980}* }(4{ color{#b39980}+ }9)$



    % /. Inactive[Subtract][a_, b_] :> (HoldForm[Plus[a, -b]])


    $(3-5){ color{#b39980}* }(4{ color{#b39980}+ }9)$






    share|improve this answer





















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      2 Answers
      2






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      2 Answers
      2






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      active

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      active

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      up vote
      6
      down vote













      ClearAll[a, b, c, d, oper]
      oper = {Subtract, Inactive@Times, Inactive@Plus} /.
      Subtract -> (HoldForm[Plus[#, -#2]] &);
      {a, b, c, d} = {3, 5, 4, 9};
      oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}]


      enter image description here






      share|improve this answer

























        up vote
        6
        down vote













        ClearAll[a, b, c, d, oper]
        oper = {Subtract, Inactive@Times, Inactive@Plus} /.
        Subtract -> (HoldForm[Plus[#, -#2]] &);
        {a, b, c, d} = {3, 5, 4, 9};
        oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}]


        enter image description here






        share|improve this answer























          up vote
          6
          down vote










          up vote
          6
          down vote









          ClearAll[a, b, c, d, oper]
          oper = {Subtract, Inactive@Times, Inactive@Plus} /.
          Subtract -> (HoldForm[Plus[#, -#2]] &);
          {a, b, c, d} = {3, 5, 4, 9};
          oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}]


          enter image description here






          share|improve this answer












          ClearAll[a, b, c, d, oper]
          oper = {Subtract, Inactive@Times, Inactive@Plus} /.
          Subtract -> (HoldForm[Plus[#, -#2]] &);
          {a, b, c, d} = {3, 5, 4, 9};
          oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}]


          enter image description here







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 28 at 22:05









          kglr

          175k9197402




          175k9197402






















              up vote
              1
              down vote













              (3 - 5)*(4 + 9) // Inactivate


              $(3 {color{#b39980}+}{text{ -}5})*(4 {color{#b39980}+} 9)$



              If you only want to inactivate the heads that appear in oper while others occur:



              hold = Function[e, Unevaluated[e] /. HoldPattern[oper[[a_]]] :>
              Inactive[Evaluate[oper[[a]]]], HoldAllComplete];

              oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}] // hold


              ${color{#b39980}Scolor{#b39980}ucolor{#b39980}bcolor{#b39980}tcolor{#b39980}rcolor{#b39980}acolor{#b39980}ccolor{#b39980}t}[3,5]{ color{#b39980}* }(4{ color{#b39980}+ }9)$



              % /. Inactive[Subtract][a_, b_] :> (HoldForm[Plus[a, -b]])


              $(3-5){ color{#b39980}* }(4{ color{#b39980}+ }9)$






              share|improve this answer

























                up vote
                1
                down vote













                (3 - 5)*(4 + 9) // Inactivate


                $(3 {color{#b39980}+}{text{ -}5})*(4 {color{#b39980}+} 9)$



                If you only want to inactivate the heads that appear in oper while others occur:



                hold = Function[e, Unevaluated[e] /. HoldPattern[oper[[a_]]] :>
                Inactive[Evaluate[oper[[a]]]], HoldAllComplete];

                oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}] // hold


                ${color{#b39980}Scolor{#b39980}ucolor{#b39980}bcolor{#b39980}tcolor{#b39980}rcolor{#b39980}acolor{#b39980}ccolor{#b39980}t}[3,5]{ color{#b39980}* }(4{ color{#b39980}+ }9)$



                % /. Inactive[Subtract][a_, b_] :> (HoldForm[Plus[a, -b]])


                $(3-5){ color{#b39980}* }(4{ color{#b39980}+ }9)$






                share|improve this answer























                  up vote
                  1
                  down vote










                  up vote
                  1
                  down vote









                  (3 - 5)*(4 + 9) // Inactivate


                  $(3 {color{#b39980}+}{text{ -}5})*(4 {color{#b39980}+} 9)$



                  If you only want to inactivate the heads that appear in oper while others occur:



                  hold = Function[e, Unevaluated[e] /. HoldPattern[oper[[a_]]] :>
                  Inactive[Evaluate[oper[[a]]]], HoldAllComplete];

                  oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}] // hold


                  ${color{#b39980}Scolor{#b39980}ucolor{#b39980}bcolor{#b39980}tcolor{#b39980}rcolor{#b39980}acolor{#b39980}ccolor{#b39980}t}[3,5]{ color{#b39980}* }(4{ color{#b39980}+ }9)$



                  % /. Inactive[Subtract][a_, b_] :> (HoldForm[Plus[a, -b]])


                  $(3-5){ color{#b39980}* }(4{ color{#b39980}+ }9)$






                  share|improve this answer












                  (3 - 5)*(4 + 9) // Inactivate


                  $(3 {color{#b39980}+}{text{ -}5})*(4 {color{#b39980}+} 9)$



                  If you only want to inactivate the heads that appear in oper while others occur:



                  hold = Function[e, Unevaluated[e] /. HoldPattern[oper[[a_]]] :>
                  Inactive[Evaluate[oper[[a]]]], HoldAllComplete];

                  oper[[2]][oper[[1]] @@ {a, b}, oper[[3]] @@ {c, d}] // hold


                  ${color{#b39980}Scolor{#b39980}ucolor{#b39980}bcolor{#b39980}tcolor{#b39980}rcolor{#b39980}acolor{#b39980}ccolor{#b39980}t}[3,5]{ color{#b39980}* }(4{ color{#b39980}+ }9)$



                  % /. Inactive[Subtract][a_, b_] :> (HoldForm[Plus[a, -b]])


                  $(3-5){ color{#b39980}* }(4{ color{#b39980}+ }9)$







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Nov 29 at 8:57









                  Coolwater

                  14.4k32452




                  14.4k32452






























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