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How to substitute values from a list into a function?


How to substitute variables in interpolated function?How to construct pairs in a list?Insert all elements from one matrix into anotherCommand to insert item into listWay to generate all multisetsHow delete a pair from a list of pairs if the last element of the pair is complex?Filter a nested list based on conditions on its elementslabeling data in a listManipulating listsMapping doesn't substitute in the values













2












$begingroup$


I was hoping to take pairs of numbers from a list and substitute them into a function. So if my list was



list = {{1,2}, {3,4}, {5,6}}


and my function was



function = a x^b


The output I'm hoping to get is



result =1x^2 + 3x^4 + 5x^6


How would I best do this?










share|improve this question







New contributor




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







$endgroup$

















    2












    $begingroup$


    I was hoping to take pairs of numbers from a list and substitute them into a function. So if my list was



    list = {{1,2}, {3,4}, {5,6}}


    and my function was



    function = a x^b


    The output I'm hoping to get is



    result =1x^2 + 3x^4 + 5x^6


    How would I best do this?










    share|improve this question







    New contributor




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







    $endgroup$















      2












      2








      2





      $begingroup$


      I was hoping to take pairs of numbers from a list and substitute them into a function. So if my list was



      list = {{1,2}, {3,4}, {5,6}}


      and my function was



      function = a x^b


      The output I'm hoping to get is



      result =1x^2 + 3x^4 + 5x^6


      How would I best do this?










      share|improve this question







      New contributor




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







      $endgroup$




      I was hoping to take pairs of numbers from a list and substitute them into a function. So if my list was



      list = {{1,2}, {3,4}, {5,6}}


      and my function was



      function = a x^b


      The output I'm hoping to get is



      result =1x^2 + 3x^4 + 5x^6


      How would I best do this?







      list-manipulation functions






      share|improve this question







      New contributor




      Pineapple 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




      Pineapple 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






      New contributor




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









      asked 41 mins ago









      PineapplePineapple

      111




      111




      New contributor




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





      New contributor





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






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






















          6 Answers
          6






          active

          oldest

          votes


















          3












          $begingroup$

          This is not a Function:



          function = a x^b


          But this is:



          function = {a,b} [Function] a x^b


          You can Apply it to each element of



          list = {{1,2}, {3,4}, {5,6}}


          with



          function @@@ list 



          {x^3, 3 x^5, 5 x^7}




          and sum it up with Total:



          Total[ function @@@ list ]



          x^3 + 3 x^5 + 5 x^7







          share|improve this answer









          $endgroup$













          • $begingroup$
            Why would you do 'function = {a,b} [Function] a x^b' instead of function[a_, b_, x_] = a*x^b?
            $endgroup$
            – Pineapple
            30 mins ago










          • $begingroup$
            Because [Function] is easily entered with the escape sequence esc f n esc . Also Function defines a pure function while function[a_, b_, x_] = a*x^b defines a replacement rule. However, they act the same way - most of the time. So it is a matter of taste.
            $endgroup$
            – Henrik Schumacher
            26 mins ago












          • $begingroup$
            @Pineapple Take a look at this tutorial on Defining Functions. Another good resource is the tutorial on Immediate and Delayed Definitions for the difference between Set (=) and SetDelayed (:=).
            $endgroup$
            – MarcoB
            12 mins ago





















          2












          $begingroup$

          Total[#*x^#2&@@@list]



          x^2 + 3 x^4 + 5 x^6







          share|improve this answer









          $endgroup$





















            1












            $begingroup$

            Total[(#[[1]] x^#[[2]]) & /@ list]





            share|improve this answer









            $endgroup$













            • $begingroup$
              Amazing, thank you! Sorry - I'm very new to Mathematica.
              $endgroup$
              – Pineapple
              31 mins ago



















            0












            $begingroup$

            FromCoefficientRules[Thread[list[[All, {2}]] -> list[[All, 1]]], x]



            x^2 + 3 x^4 + 5 x^6




            Internal`FromCoefficientList[Normal@SparseArray[1 + list[[All, {2}]] -> list[[All, 1]]], x]



            x^2 + 3 x^4 + 5 x^6






            share









            $endgroup$





















              0












              $begingroup$

              Inner[#1 x^#2 &, Sequence @@ Transpose@list, Plus]



              x^2 + 3 x^4 + 5 x^6






              share









              $endgroup$





















                0












                $begingroup$

                Another way, perhaps easier on the eyes. Use a pattern to deconstruct the pairs in a function definition.



                term[{a_, b_}] := a x^b


                Then, Map it to the list.



                Total[term /@ list]
                (* x^2 + 3 x^4 + 5 x^6 *)




                share









                $endgroup$













                  Your Answer





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                  6 Answers
                  6






                  active

                  oldest

                  votes








                  6 Answers
                  6






                  active

                  oldest

                  votes









                  active

                  oldest

                  votes






                  active

                  oldest

                  votes









                  3












                  $begingroup$

                  This is not a Function:



                  function = a x^b


                  But this is:



                  function = {a,b} [Function] a x^b


                  You can Apply it to each element of



                  list = {{1,2}, {3,4}, {5,6}}


                  with



                  function @@@ list 



                  {x^3, 3 x^5, 5 x^7}




                  and sum it up with Total:



                  Total[ function @@@ list ]



                  x^3 + 3 x^5 + 5 x^7







                  share|improve this answer









                  $endgroup$













                  • $begingroup$
                    Why would you do 'function = {a,b} [Function] a x^b' instead of function[a_, b_, x_] = a*x^b?
                    $endgroup$
                    – Pineapple
                    30 mins ago










                  • $begingroup$
                    Because [Function] is easily entered with the escape sequence esc f n esc . Also Function defines a pure function while function[a_, b_, x_] = a*x^b defines a replacement rule. However, they act the same way - most of the time. So it is a matter of taste.
                    $endgroup$
                    – Henrik Schumacher
                    26 mins ago












                  • $begingroup$
                    @Pineapple Take a look at this tutorial on Defining Functions. Another good resource is the tutorial on Immediate and Delayed Definitions for the difference between Set (=) and SetDelayed (:=).
                    $endgroup$
                    – MarcoB
                    12 mins ago


















                  3












                  $begingroup$

                  This is not a Function:



                  function = a x^b


                  But this is:



                  function = {a,b} [Function] a x^b


                  You can Apply it to each element of



                  list = {{1,2}, {3,4}, {5,6}}


                  with



                  function @@@ list 



                  {x^3, 3 x^5, 5 x^7}




                  and sum it up with Total:



                  Total[ function @@@ list ]



                  x^3 + 3 x^5 + 5 x^7







                  share|improve this answer









                  $endgroup$













                  • $begingroup$
                    Why would you do 'function = {a,b} [Function] a x^b' instead of function[a_, b_, x_] = a*x^b?
                    $endgroup$
                    – Pineapple
                    30 mins ago










                  • $begingroup$
                    Because [Function] is easily entered with the escape sequence esc f n esc . Also Function defines a pure function while function[a_, b_, x_] = a*x^b defines a replacement rule. However, they act the same way - most of the time. So it is a matter of taste.
                    $endgroup$
                    – Henrik Schumacher
                    26 mins ago












                  • $begingroup$
                    @Pineapple Take a look at this tutorial on Defining Functions. Another good resource is the tutorial on Immediate and Delayed Definitions for the difference between Set (=) and SetDelayed (:=).
                    $endgroup$
                    – MarcoB
                    12 mins ago
















                  3












                  3








                  3





                  $begingroup$

                  This is not a Function:



                  function = a x^b


                  But this is:



                  function = {a,b} [Function] a x^b


                  You can Apply it to each element of



                  list = {{1,2}, {3,4}, {5,6}}


                  with



                  function @@@ list 



                  {x^3, 3 x^5, 5 x^7}




                  and sum it up with Total:



                  Total[ function @@@ list ]



                  x^3 + 3 x^5 + 5 x^7







                  share|improve this answer









                  $endgroup$



                  This is not a Function:



                  function = a x^b


                  But this is:



                  function = {a,b} [Function] a x^b


                  You can Apply it to each element of



                  list = {{1,2}, {3,4}, {5,6}}


                  with



                  function @@@ list 



                  {x^3, 3 x^5, 5 x^7}




                  and sum it up with Total:



                  Total[ function @@@ list ]



                  x^3 + 3 x^5 + 5 x^7








                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 35 mins ago









                  Henrik SchumacherHenrik Schumacher

                  55.4k576154




                  55.4k576154












                  • $begingroup$
                    Why would you do 'function = {a,b} [Function] a x^b' instead of function[a_, b_, x_] = a*x^b?
                    $endgroup$
                    – Pineapple
                    30 mins ago










                  • $begingroup$
                    Because [Function] is easily entered with the escape sequence esc f n esc . Also Function defines a pure function while function[a_, b_, x_] = a*x^b defines a replacement rule. However, they act the same way - most of the time. So it is a matter of taste.
                    $endgroup$
                    – Henrik Schumacher
                    26 mins ago












                  • $begingroup$
                    @Pineapple Take a look at this tutorial on Defining Functions. Another good resource is the tutorial on Immediate and Delayed Definitions for the difference between Set (=) and SetDelayed (:=).
                    $endgroup$
                    – MarcoB
                    12 mins ago




















                  • $begingroup$
                    Why would you do 'function = {a,b} [Function] a x^b' instead of function[a_, b_, x_] = a*x^b?
                    $endgroup$
                    – Pineapple
                    30 mins ago










                  • $begingroup$
                    Because [Function] is easily entered with the escape sequence esc f n esc . Also Function defines a pure function while function[a_, b_, x_] = a*x^b defines a replacement rule. However, they act the same way - most of the time. So it is a matter of taste.
                    $endgroup$
                    – Henrik Schumacher
                    26 mins ago












                  • $begingroup$
                    @Pineapple Take a look at this tutorial on Defining Functions. Another good resource is the tutorial on Immediate and Delayed Definitions for the difference between Set (=) and SetDelayed (:=).
                    $endgroup$
                    – MarcoB
                    12 mins ago


















                  $begingroup$
                  Why would you do 'function = {a,b} [Function] a x^b' instead of function[a_, b_, x_] = a*x^b?
                  $endgroup$
                  – Pineapple
                  30 mins ago




                  $begingroup$
                  Why would you do 'function = {a,b} [Function] a x^b' instead of function[a_, b_, x_] = a*x^b?
                  $endgroup$
                  – Pineapple
                  30 mins ago












                  $begingroup$
                  Because [Function] is easily entered with the escape sequence esc f n esc . Also Function defines a pure function while function[a_, b_, x_] = a*x^b defines a replacement rule. However, they act the same way - most of the time. So it is a matter of taste.
                  $endgroup$
                  – Henrik Schumacher
                  26 mins ago






                  $begingroup$
                  Because [Function] is easily entered with the escape sequence esc f n esc . Also Function defines a pure function while function[a_, b_, x_] = a*x^b defines a replacement rule. However, they act the same way - most of the time. So it is a matter of taste.
                  $endgroup$
                  – Henrik Schumacher
                  26 mins ago














                  $begingroup$
                  @Pineapple Take a look at this tutorial on Defining Functions. Another good resource is the tutorial on Immediate and Delayed Definitions for the difference between Set (=) and SetDelayed (:=).
                  $endgroup$
                  – MarcoB
                  12 mins ago






                  $begingroup$
                  @Pineapple Take a look at this tutorial on Defining Functions. Another good resource is the tutorial on Immediate and Delayed Definitions for the difference between Set (=) and SetDelayed (:=).
                  $endgroup$
                  – MarcoB
                  12 mins ago













                  2












                  $begingroup$

                  Total[#*x^#2&@@@list]



                  x^2 + 3 x^4 + 5 x^6







                  share|improve this answer









                  $endgroup$


















                    2












                    $begingroup$

                    Total[#*x^#2&@@@list]



                    x^2 + 3 x^4 + 5 x^6







                    share|improve this answer









                    $endgroup$
















                      2












                      2








                      2





                      $begingroup$

                      Total[#*x^#2&@@@list]



                      x^2 + 3 x^4 + 5 x^6







                      share|improve this answer









                      $endgroup$



                      Total[#*x^#2&@@@list]



                      x^2 + 3 x^4 + 5 x^6








                      share|improve this answer












                      share|improve this answer



                      share|improve this answer










                      answered 31 mins ago









                      J42161217J42161217

                      3,935322




                      3,935322























                          1












                          $begingroup$

                          Total[(#[[1]] x^#[[2]]) & /@ list]





                          share|improve this answer









                          $endgroup$













                          • $begingroup$
                            Amazing, thank you! Sorry - I'm very new to Mathematica.
                            $endgroup$
                            – Pineapple
                            31 mins ago
















                          1












                          $begingroup$

                          Total[(#[[1]] x^#[[2]]) & /@ list]





                          share|improve this answer









                          $endgroup$













                          • $begingroup$
                            Amazing, thank you! Sorry - I'm very new to Mathematica.
                            $endgroup$
                            – Pineapple
                            31 mins ago














                          1












                          1








                          1





                          $begingroup$

                          Total[(#[[1]] x^#[[2]]) & /@ list]





                          share|improve this answer









                          $endgroup$



                          Total[(#[[1]] x^#[[2]]) & /@ list]






                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered 36 mins ago









                          David G. StorkDavid G. Stork

                          24.5k22153




                          24.5k22153












                          • $begingroup$
                            Amazing, thank you! Sorry - I'm very new to Mathematica.
                            $endgroup$
                            – Pineapple
                            31 mins ago


















                          • $begingroup$
                            Amazing, thank you! Sorry - I'm very new to Mathematica.
                            $endgroup$
                            – Pineapple
                            31 mins ago
















                          $begingroup$
                          Amazing, thank you! Sorry - I'm very new to Mathematica.
                          $endgroup$
                          – Pineapple
                          31 mins ago




                          $begingroup$
                          Amazing, thank you! Sorry - I'm very new to Mathematica.
                          $endgroup$
                          – Pineapple
                          31 mins ago











                          0












                          $begingroup$

                          FromCoefficientRules[Thread[list[[All, {2}]] -> list[[All, 1]]], x]



                          x^2 + 3 x^4 + 5 x^6




                          Internal`FromCoefficientList[Normal@SparseArray[1 + list[[All, {2}]] -> list[[All, 1]]], x]



                          x^2 + 3 x^4 + 5 x^6






                          share









                          $endgroup$


















                            0












                            $begingroup$

                            FromCoefficientRules[Thread[list[[All, {2}]] -> list[[All, 1]]], x]



                            x^2 + 3 x^4 + 5 x^6




                            Internal`FromCoefficientList[Normal@SparseArray[1 + list[[All, {2}]] -> list[[All, 1]]], x]



                            x^2 + 3 x^4 + 5 x^6






                            share









                            $endgroup$
















                              0












                              0








                              0





                              $begingroup$

                              FromCoefficientRules[Thread[list[[All, {2}]] -> list[[All, 1]]], x]



                              x^2 + 3 x^4 + 5 x^6




                              Internal`FromCoefficientList[Normal@SparseArray[1 + list[[All, {2}]] -> list[[All, 1]]], x]



                              x^2 + 3 x^4 + 5 x^6






                              share









                              $endgroup$



                              FromCoefficientRules[Thread[list[[All, {2}]] -> list[[All, 1]]], x]



                              x^2 + 3 x^4 + 5 x^6




                              Internal`FromCoefficientList[Normal@SparseArray[1 + list[[All, {2}]] -> list[[All, 1]]], x]



                              x^2 + 3 x^4 + 5 x^6







                              share











                              share


                              share










                              answered 4 mins ago









                              kglrkglr

                              187k10203422




                              187k10203422























                                  0












                                  $begingroup$

                                  Inner[#1 x^#2 &, Sequence @@ Transpose@list, Plus]



                                  x^2 + 3 x^4 + 5 x^6






                                  share









                                  $endgroup$


















                                    0












                                    $begingroup$

                                    Inner[#1 x^#2 &, Sequence @@ Transpose@list, Plus]



                                    x^2 + 3 x^4 + 5 x^6






                                    share









                                    $endgroup$
















                                      0












                                      0








                                      0





                                      $begingroup$

                                      Inner[#1 x^#2 &, Sequence @@ Transpose@list, Plus]



                                      x^2 + 3 x^4 + 5 x^6






                                      share









                                      $endgroup$



                                      Inner[#1 x^#2 &, Sequence @@ Transpose@list, Plus]



                                      x^2 + 3 x^4 + 5 x^6







                                      share











                                      share


                                      share










                                      answered 2 mins ago









                                      MarcoBMarcoB

                                      36.7k556113




                                      36.7k556113























                                          0












                                          $begingroup$

                                          Another way, perhaps easier on the eyes. Use a pattern to deconstruct the pairs in a function definition.



                                          term[{a_, b_}] := a x^b


                                          Then, Map it to the list.



                                          Total[term /@ list]
                                          (* x^2 + 3 x^4 + 5 x^6 *)




                                          share









                                          $endgroup$


















                                            0












                                            $begingroup$

                                            Another way, perhaps easier on the eyes. Use a pattern to deconstruct the pairs in a function definition.



                                            term[{a_, b_}] := a x^b


                                            Then, Map it to the list.



                                            Total[term /@ list]
                                            (* x^2 + 3 x^4 + 5 x^6 *)




                                            share









                                            $endgroup$
















                                              0












                                              0








                                              0





                                              $begingroup$

                                              Another way, perhaps easier on the eyes. Use a pattern to deconstruct the pairs in a function definition.



                                              term[{a_, b_}] := a x^b


                                              Then, Map it to the list.



                                              Total[term /@ list]
                                              (* x^2 + 3 x^4 + 5 x^6 *)




                                              share









                                              $endgroup$



                                              Another way, perhaps easier on the eyes. Use a pattern to deconstruct the pairs in a function definition.



                                              term[{a_, b_}] := a x^b


                                              Then, Map it to the list.



                                              Total[term /@ list]
                                              (* x^2 + 3 x^4 + 5 x^6 *)





                                              share











                                              share


                                              share










                                              answered 28 secs ago









                                              John DotyJohn Doty

                                              7,17311024




                                              7,17311024






















                                                  Pineapple is a new contributor. Be nice, and check out our Code of Conduct.










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                                                  Pineapple is a new contributor. Be nice, and check out our Code of Conduct.













                                                  Pineapple is a new contributor. Be nice, and check out our Code of Conduct.












                                                  Pineapple is a new contributor. Be nice, and check out our Code of Conduct.
















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