Multiply columns in a data frame by a vector

Question

What I want to do is multiply all the values in column 1 of a data.frame by the first element in a vector, then multiply all the values in column 2 by the 2nd element in the

Answer 1

We can also replicate the vector to make the lengths equal and then multiply

d1*v1[col(d1)]
#  c1 c2 c3
#1  1  8 21
#2  2 10 24
#3  3 12 27

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Or use sweep

sweep(d1, 2, v1, FUN="*")

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Or with mapply to multiply the corresponding columns of 'data.frame' and elements of 'vector'

mapply(`*`, d1, v1)