Taking the square root of the first element of a list

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3
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If I have a list for example : 



 4,1,9,2,16,3,25,4


Is there a command that replaces the first element by its square root and returns a list ? In the example above it would return : 



 2,1,3,2,4,3,5,4


(Obviously the list above is short and easy to manipulate, but I'm asking a question for a longer and more complicated one)






list-manipulation







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    up vote
    3
    down vote

    favorite












    If I have a list for example : 



     4,1,9,2,16,3,25,4


    Is there a command that replaces the first element by its square root and returns a list ? In the example above it would return : 



     2,1,3,2,4,3,5,4


    (Obviously the list above is short and easy to manipulate, but I'm asking a question for a longer and more complicated one)






    list-manipulation







    share|improve this question























      up vote
      3
      down vote

      favorite









      up vote
      3
      down vote

      favorite











      If I have a list for example : 



       4,1,9,2,16,3,25,4


      Is there a command that replaces the first element by its square root and returns a list ? In the example above it would return : 



       2,1,3,2,4,3,5,4


      (Obviously the list above is short and easy to manipulate, but I'm asking a question for a longer and more complicated one)






      list-manipulation







      share|improve this question













      If I have a list for example : 



       4,1,9,2,16,3,25,4


      Is there a command that replaces the first element by its square root and returns a list ? In the example above it would return : 



       2,1,3,2,4,3,5,4


      (Obviously the list above is short and easy to manipulate, but I'm asking a question for a longer and more complicated one)






      list-manipulation




      list-manipulation






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 1 hour ago









      J.A

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      794




















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          MapAt[Sqrt, 4, 1, 9, 2, 16, 3, 25, 4, All, 1]



          2, 1, 3, 2, 4, 3, 5, 4







          share|improve this answer




















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            1 Answer
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            up vote
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            MapAt[Sqrt, 4, 1, 9, 2, 16, 3, 25, 4, All, 1]



            2, 1, 3, 2, 4, 3, 5, 4







            share|improve this answer
























              up vote
              3
              down vote













              MapAt[Sqrt, 4, 1, 9, 2, 16, 3, 25, 4, All, 1]



              2, 1, 3, 2, 4, 3, 5, 4







              share|improve this answer






















                up vote
                3
                down vote










                up vote
                3
                down vote









                MapAt[Sqrt, 4, 1, 9, 2, 16, 3, 25, 4, All, 1]



                2, 1, 3, 2, 4, 3, 5, 4







                share|improve this answer












                MapAt[Sqrt, 4, 1, 9, 2, 16, 3, 25, 4, All, 1]



                2, 1, 3, 2, 4, 3, 5, 4








                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 1 hour ago









                Henrik Schumacher

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