Convert Factors to Numeric Variables

DESCRIPTION:

Convert factors in a data structure to numeric vectors.

This function is an S Version 3 generic (see Methods); method functions can be written to handle specific S Version 3 classes of data. Classes which already have methods for this function include:
factor data.frame

USAGE:

fac2num(x, ...) 
fac2num.default(x, ...) 

REQUIRED ARGUMENTS:

x
An S object.

VALUE:

Returns x unchanged if is.numeric(x) is TRUE. Otherwise generates an error.

EXAMPLES:

df1 <- data.frame(ordered(rep(c("hi", "low"), 10)), 
     factor(rep(c("+","-"), rep(2,5))), x = rnorm(10)) 
df2 <- fac2num(df1)