How to calculate cumulative mean in R?

Question

(I am sorry if the term is not correct).

In R, I have a numeric vector x. I want to create new vector y where:

y[i] = mean (x[1:i)

It is easy to write a function to calculate y, but is there a built-in function in R which do the task?

Thank you very much

The answer below is actually better IMO than the current top answers at the linked question above (and because of which this was flagged as duplicate). — andybega, Mar 29 '19 at 12:00

score 11 · Accepted Answer · answered Jun 26 '17 at 10:07

11

Try this

y <- cumsum(x) / seq_along(x)

answered Jun 26 '17 at 10:07

Kalidoss M

1 Answers1