Divide each data frame row by vector in R

Question

I\'m trying to divide each number within a data frame with 16 columns by a specific number for each column. The numbers are stored as a data frame with 1-16 corresponding to

Answer 1

Suppose we have a dataframe, df:

> df
  a b   c
1 1 3 100
2 2 4 110

And we want to divide through each row by the same vector, vec:

> vec <- df[1,]
> vec
  a b   c
1 1 3 100

Then we can use mapply as follows:

> mapply('/', df, vec)
     a        b   c
[1,] 1 1.000000 1.0
[2,] 2 1.333333 1.1