Create a new colum in a dataframe using a function












1















So I think I am haveing a simple problem.



I have a dataframe (my_data), that looks like this



Treatment Amount Duration
a 5 3000
b 8 2000
c 6 1000
d 2 5000



Now I want to create a new dataframe (my_data_1) which adds a new colom based on a simple function Duration/Amount.



my_data_1 should look like this:



Treatment Amount Duration Mean duration
a 5 3000 600
b 8 2000 250
c 6 1000 167
d 2 5000 2500



I tried to write a function and implement it into my dataframe



mean_duration <- function(md){my_data$Duration / my_data$Amount}



my_data_1$md <- with(my_data, ave(Duration, Amount, FUN = mean_duration))



Where did I go wrong?






function dataframe







share|improve this question



























    1















    So I think I am haveing a simple problem.



    I have a dataframe (my_data), that looks like this



    Treatment Amount Duration
    a 5 3000
    b 8 2000
    c 6 1000
    d 2 5000



    Now I want to create a new dataframe (my_data_1) which adds a new colom based on a simple function Duration/Amount.



    my_data_1 should look like this:



    Treatment Amount Duration Mean duration
    a 5 3000 600
    b 8 2000 250
    c 6 1000 167
    d 2 5000 2500



    I tried to write a function and implement it into my dataframe



    mean_duration <- function(md){my_data$Duration / my_data$Amount}



    my_data_1$md <- with(my_data, ave(Duration, Amount, FUN = mean_duration))



    Where did I go wrong?






    function dataframe







    share|improve this question

























      1












      1








      1








      So I think I am haveing a simple problem.



      I have a dataframe (my_data), that looks like this



      Treatment Amount Duration
      a 5 3000
      b 8 2000
      c 6 1000
      d 2 5000



      Now I want to create a new dataframe (my_data_1) which adds a new colom based on a simple function Duration/Amount.



      my_data_1 should look like this:



      Treatment Amount Duration Mean duration
      a 5 3000 600
      b 8 2000 250
      c 6 1000 167
      d 2 5000 2500



      I tried to write a function and implement it into my dataframe



      mean_duration <- function(md){my_data$Duration / my_data$Amount}



      my_data_1$md <- with(my_data, ave(Duration, Amount, FUN = mean_duration))



      Where did I go wrong?






      function dataframe







      share|improve this question














      So I think I am haveing a simple problem.



      I have a dataframe (my_data), that looks like this



      Treatment Amount Duration
      a 5 3000
      b 8 2000
      c 6 1000
      d 2 5000



      Now I want to create a new dataframe (my_data_1) which adds a new colom based on a simple function Duration/Amount.



      my_data_1 should look like this:



      Treatment Amount Duration Mean duration
      a 5 3000 600
      b 8 2000 250
      c 6 1000 167
      d 2 5000 2500



      I tried to write a function and implement it into my dataframe



      mean_duration <- function(md){my_data$Duration / my_data$Amount}



      my_data_1$md <- with(my_data, ave(Duration, Amount, FUN = mean_duration))



      Where did I go wrong?






      function dataframe




      function dataframe






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 13 '18 at 13:39









      FelixFelix

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