| to.factor | R Documentation | 
Loops through columsn in dataframe and coerces them to type "factor".  
to.factor(df, id = NULL)
| df | a matrix or dataframe. | 
| id | a vector specifying the columns (by name or index) to be converted. The default will convert all columns. | 
A dataframe
Jason Grafmiller
as.factor, is.factor, to.numeric
df <- mtcars
summary(df)
df <- to.factor(df, c("cyl", "gear", "carb"))
# or alternatively
# df <- to.factor(df, c(2, 10:11))
summary(df)
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