r - Convert strings representing unit of time or distance to numeric -

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i search data.frame column string distances , convert them numeric fields. same on twitter style dates such '3 days ago' using same function.

if starting with:

x <- c("5 days ago", "1 day ago", "6 days ago")

i end with:

x <- c(120, 24, 144)

any appreciated!

if data consist "number days ago" or "number miles" can use regular expressions:

> x <- c("5 days ago", "1 day ago", "6 days ago", "21.2 miles", "1 mile") > x[grep(" day",x)] <- as.numeric(gsub("[ daysago]","",x[grep(" day",x)] ))*24 > x [1] "120"        "24"         "144"        "21.2 miles" "1 mile"     > x[grep(" mile",x)] <- as.numeric(gsub("[ miles]","",x[grep(" mile",x)] ))  > x [1] "120"  "24"   "144"  "21.2" "1"    > x <- as.numeric(x) > x [1] 120.0  24.0 144.0  21.2   1.0

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