r - using stringr to split vectors, unexpected result length -


something simple i'm messing in using stringr manipulate character vectors. have data frame of following sort

library(stringr) d1 <- data.frame(x = str_c(rpois(10, lambda=5),                             rpois(10, lambda=10),                            sep = "_"))

and want after underscore separate variable. use of str_sub results in vector of length 20, , i'm @ loss explain why. 

d1$y <- str_sub(d1$x, str_locate(d1$x, fixed("_"))+1)

error in $<-.data.frame(*tmp*, "y", value = c("_12", "_7", "_15", : replacement has 20 rows, data has 10

could direct me how write str_sub call in right way?

this want doing (check out output of str_locate see why wasn't working you, note str_sub recycles arguments):

d1$y = str_sub(d1$x, str_locate(d1$x, fixed("_"))[,1] + 1, -1)

or in base r:

d1$y = sub("^[^_]*_", "", d1$x)

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