Calculate cumulative product / multiple

Question

Suppose I have a vector x as:

x <- c(X1, X2, X3, ..., Xn)

I want to write a function that automatically get the result series like this:

y <- c(X1, X1*X2, X1*X2*X3, ..., X1*X2*X3*...*Xn)

Can someone tell me how to do this in R?

Answer 1

Have a look at ?cumprod:

 cumprod(1:10)
 # [1]       1       2       6      24     120     720    5040   40320  362880 3628800