Extract numeric component of variable.
This uses a regular expression to strip all non-numeric character from a string and then coerces the result to a number. This is useful for strings that are numbers with extra formatting (e.g. $1,200.34).
- A character vector (or a factor).
extract_numeric("$1,200.34") extract_numeric("-2%") # The heuristic is not perfect - it won't fail for things that # clearly aren't numbers extract_numeric("-2-2") extract_numeric("12abc34")
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