Converting Categorical Variables To Continuous

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# Create some dirty data that because of the mispelling is imported as a character string
dirty <- data.frame(x <- c("1.23", "4..56", "7.89"))
# Convert the elements to numeric
factor_to_numeric <- function(f)

# The data is converted, but the 4..56 is treated as an NA
Warning message:
In factor_to_numeric(dirty$x): NAs introduced by coercion

[1] 1.23   NA 7.89