How to drop certain elements in certain positions from a list using drop function











up vote
3
down vote

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a = Table[i, {i, 1, 10}]

Drop[a, {5, 8}]


If go with the above procedure, It will delete all the elements from between position 5 to 8. How to drop elements which are a position 5 and position 8 using drop function.






list-manipulation matrix







share|improve this question


























    up vote
    3
    down vote

    favorite












    a = Table[i, {i, 1, 10}]
    
Drop[a, {5, 8}]


    If go with the above procedure, It will delete all the elements from between position 5 to 8. How to drop elements which are a position 5 and position 8 using drop function.






    list-manipulation matrix







    share|improve this question
























      up vote
      3
      down vote

      favorite









      up vote
      3
      down vote

      favorite











      a = Table[i, {i, 1, 10}]
      
Drop[a, {5, 8}]


      If go with the above procedure, It will delete all the elements from between position 5 to 8. How to drop elements which are a position 5 and position 8 using drop function.






      list-manipulation matrix







      share|improve this question













      a = Table[i, {i, 1, 10}]
      
Drop[a, {5, 8}]


      If go with the above procedure, It will delete all the elements from between position 5 to 8. How to drop elements which are a position 5 and position 8 using drop function.






      list-manipulation matrix




      list-manipulation matrix






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 29 at 7:22









      acoustics

      3218




      3218






















          2 Answers
          2






          active

          oldest

          votes

















          up vote
          5
          down vote



          accepted










          Use instead Delete, in this way:



          a = Table[i, {i, 1, 10}];
          
Delete[a, {{5}, {8}}]


          (*



          {1, 2, 3, 4, 6, 7, 9, 10}



          *)



          By the way, you can be far more efficient:



          a = Range[10]





          share|improve this answer





















          • can we give the list of position which I wanted to drop like {3,5,8,9}
            – acoustics
            Nov 29 at 7:49






          • 2




            Delete[a,{{3},{5},{8},{9}}]
            – David G. Stork
            Nov 29 at 7:50






          • 1




            Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind... if the list of positions gets longer.
            – Henrik Schumacher
            Nov 29 at 8:04


















          up vote
          3
          down vote













          Drop[a, {5, 8, 3}]



          {1, 2, 3, 4, 6, 7, 9, 10}




          Fold[Drop[#, {#2}] &, a, Reverse[{5, 8}]]



          {1, 2, 3, 4, 6, 7, 9, 10}







          share|improve this answer























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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes








            up vote
            5
            down vote



            accepted










            Use instead Delete, in this way:



            a = Table[i, {i, 1, 10}];
            
Delete[a, {{5}, {8}}]


            (*



            {1, 2, 3, 4, 6, 7, 9, 10}



            *)



            By the way, you can be far more efficient:



            a = Range[10]





            share|improve this answer





















            • can we give the list of position which I wanted to drop like {3,5,8,9}
              – acoustics
              Nov 29 at 7:49






            • 2




              Delete[a,{{3},{5},{8},{9}}]
              – David G. Stork
              Nov 29 at 7:50






            • 1




              Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind... if the list of positions gets longer.
              – Henrik Schumacher
              Nov 29 at 8:04















            up vote
            5
            down vote



            accepted










            Use instead Delete, in this way:



            a = Table[i, {i, 1, 10}];
            
Delete[a, {{5}, {8}}]


            (*



            {1, 2, 3, 4, 6, 7, 9, 10}



            *)



            By the way, you can be far more efficient:



            a = Range[10]





            share|improve this answer





















            • can we give the list of position which I wanted to drop like {3,5,8,9}
              – acoustics
              Nov 29 at 7:49






            • 2




              Delete[a,{{3},{5},{8},{9}}]
              – David G. Stork
              Nov 29 at 7:50






            • 1




              Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind... if the list of positions gets longer.
              – Henrik Schumacher
              Nov 29 at 8:04













            up vote
            5
            down vote



            accepted







            up vote
            5
            down vote



            accepted






            Use instead Delete, in this way:



            a = Table[i, {i, 1, 10}];
            
Delete[a, {{5}, {8}}]


            (*



            {1, 2, 3, 4, 6, 7, 9, 10}



            *)



            By the way, you can be far more efficient:



            a = Range[10]





            share|improve this answer












            Use instead Delete, in this way:



            a = Table[i, {i, 1, 10}];
            
Delete[a, {{5}, {8}}]


            (*



            {1, 2, 3, 4, 6, 7, 9, 10}



            *)



            By the way, you can be far more efficient:



            a = Range[10]






            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Nov 29 at 7:25









            David G. Stork

            22.5k21849




            22.5k21849












            • can we give the list of position which I wanted to drop like {3,5,8,9}
              – acoustics
              Nov 29 at 7:49






            • 2




              Delete[a,{{3},{5},{8},{9}}]
              – David G. Stork
              Nov 29 at 7:50






            • 1




              Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind... if the list of positions gets longer.
              – Henrik Schumacher
              Nov 29 at 8:04


















            • can we give the list of position which I wanted to drop like {3,5,8,9}
              – acoustics
              Nov 29 at 7:49






            • 2




              Delete[a,{{3},{5},{8},{9}}]
              – David G. Stork
              Nov 29 at 7:50






            • 1




              Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind... if the list of positions gets longer.
              – Henrik Schumacher
              Nov 29 at 8:04
















            can we give the list of position which I wanted to drop like {3,5,8,9}
            – acoustics
            Nov 29 at 7:49




            can we give the list of position which I wanted to drop like {3,5,8,9}
            – acoustics
            Nov 29 at 7:49




            2




            2




            Delete[a,{{3},{5},{8},{9}}]
            – David G. Stork
            Nov 29 at 7:50




            Delete[a,{{3},{5},{8},{9}}]
            – David G. Stork
            Nov 29 at 7:50




            1




            1




            Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind... if the list of positions gets longer.
            – Henrik Schumacher
            Nov 29 at 8:04




            Also Delete[a, Partition[{3, 5, 8, 9}, 1]] comes to mind... if the list of positions gets longer.
            – Henrik Schumacher
            Nov 29 at 8:04










            up vote
            3
            down vote













            Drop[a, {5, 8, 3}]



            {1, 2, 3, 4, 6, 7, 9, 10}




            Fold[Drop[#, {#2}] &, a, Reverse[{5, 8}]]



            {1, 2, 3, 4, 6, 7, 9, 10}







            share|improve this answer



























              up vote
              3
              down vote













              Drop[a, {5, 8, 3}]



              {1, 2, 3, 4, 6, 7, 9, 10}




              Fold[Drop[#, {#2}] &, a, Reverse[{5, 8}]]



              {1, 2, 3, 4, 6, 7, 9, 10}







              share|improve this answer

























                up vote
                3
                down vote










                up vote
                3
                down vote









                Drop[a, {5, 8, 3}]



                {1, 2, 3, 4, 6, 7, 9, 10}




                Fold[Drop[#, {#2}] &, a, Reverse[{5, 8}]]



                {1, 2, 3, 4, 6, 7, 9, 10}







                share|improve this answer














                Drop[a, {5, 8, 3}]



                {1, 2, 3, 4, 6, 7, 9, 10}




                Fold[Drop[#, {#2}] &, a, Reverse[{5, 8}]]



                {1, 2, 3, 4, 6, 7, 9, 10}








                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Nov 29 at 7:49

























                answered Nov 29 at 7:35









                kglr

                174k9196402




                174k9196402






























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