Multiplication a number nth times

Question

New to R.

I have 2 columns 'X' and Y (x*0.78) repeated Y times as shown below

I am trying to multiply 'X' by 0.78 Y (nth)times e.g. x*0.78=ans*0.78=ans*0.78=ans*0.78.... however many times specified in row Y

So far have tried through writing own function but failed

Answer 1

Is this what you are after?

# sample data
my_data <- data.frame(x = c(4.98, 6.64, 1.66, 0, 3.32), y = c(18,5,8,10,8) )

my_data$ans = my_data$x*0.78^my_data$y
my_data$ans

#[1] 0.05687641 1.91708378 0.22743899 0.00000000 0.45487797

Or

library(tidyverse)
my_data <- tibble(x = c(4.98, 6.64, 1.66, 0, 3.32), y = c(18,5,8,10,8) )

my_data %>% 
  mutate(ans = x * 0.78^y)