Hello, I want to sum test column based on the test wt and values of previous values.
for example:
df <- mtcars %>%
select(mpg,wt) %>%
mutate(test = 0) %>%
head()
df[1,3] <- df[1,2]
df[2,3] <- df[2,2] + df[1,3]
df[3,3] <- df[3,2] + df[2,3]
df[4,3] <- df[4,2] + df[3,3]
df[5,3] <- df[5,2] + df[4,3]
df[6,3] <- df[6,2] + df[5,3]