r - How do I make a column that sums only numeric columns? -


i have dataframe lot of columns.

label    col1  col2  col3 meat     10    20    30 veggies  20    30    40

how make column named sumcol adds col1, col2, col3, , other numeric columns add?

example of sumcol above columns:

sumcol 60 90

you can use function, takes advantage of select_if , scoped argument is_numeric 

myfun <- function(df) {                require(dplyr)                y <- select_if(df, is_numeric)                rowsums(y, na.rm=t)          }

solution

df$sumcol <- myfun(df)

output

    label col1 col2 col3 sumcol 1    meat   10   20   30     60 2 veggies   20   30   40     90

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