Sum all values in every column of a data frame in R

Question

Given this data set     Name Height Weight 1 Mary     65    110 2 John     70    200 3 Jane     64    115   I d like to sum every qualifier columns  Height and Weight  yielding   199  425   The problem is that the qualifiers can be more than just 2  i e  more than just Height and Weight    I can do this         Create the dataframe people     Name  lt - c  Mary    John    Jane       Height  lt - c 65 70 64      Weight  lt - c 110 200 115      people  lt - data frame Name  Height  Weight       res  lt - c sum people Height  sum people Weight     But it gets too long when the qualifier increase  What s the compact way to do it

User · Answer

For the sake of completion    apply people  -1   2  function x  sum x    Height Weight      199    425

User · Answer

You can use function colSums   to calculate sum of all values     -1  ensures that first column with names of people is excluded    colSums people  -1   Height Weight     199    425   Assuming there could be multiple columns that are not numeric  or that your column order is not fixed  a more general approach would be   colSums Filter is numeric  people

User · Answer

We can use dplyr to select only numeric columns and purr to get sum for all columns   can be used to get what ever value for all columns  such as mean  min  max  etc     library  dplyr   library  purrr    people   gt       select if is numeric    gt       map dbl sum    Or another easy way by only using dplyr  library  dplyr   people   gt       summarize if is numeric  sum  na rm TRUE

User · Answer

mapply sum people  -1    Height Weight     199    425

[r] Sum all values in every column of a data.frame in R

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