Get a list of numbers from range(s) of number

Question

I have a data frame where one column contains a range (or ranges) of numbers. I would like to turn this into a list of numbers based of the given range.

Example input:

Answer 1

We can do a split and with Map, get the numbers

do.call(Map, c(`:`, lapply(strsplit(df1$v1, '-'), as.numeric)))
#[[1]]
# [1] 35 36 37 38 39 40 41 42 43 44 45

#[[2]]
#[1] 43 44 45 46 47

---

If we need to find the sequence within the string

lapply(strsplit(df1$v1, "-"), function(x) Reduce(`:`, as.numeric(x)))
#[1]]
#[1] 35 36 37 38 39 40 41 42 43

#[[2]]
#[1] 45 46 47

Update

If we have multiple elements in a string

df1 <- structure(list(v1 = c("35-43", "45-47", "30-42, 25-27")), 
.Names = "v1", row.names = c(NA, 
 -3L), class = "data.frame")

lapply(strsplit(df1$v1, ", "), function(x) do.call(c, 
    lapply(strsplit(x, "-"), function(y) Reduce(`:`, as.numeric(y)))))

data

df1 <- structure(list(v1 = c("35-43", "45-47")), .Names = "v1", row.names = c(NA, 
-2L), class = "data.frame")