Hi,
   I formed a 49 by 3 data frame by reading in a text file using read.table(), and combining it with a matrix that I made by using unlist() on a list of character strings. I would like to do some simple arithmetic operations on the elements in the data frame columns (e.g. column 3/column2) but the values in the data frame are stored as factors and using stringsAsFactors=FALSE did not work. I get this error when doing arithmetic operations:
In Ops.factor(dataframe$col3, dataframe$col2) : / not meaningful for factors
Is there a way to store these values not as factors or convert them to numeric values? Or a way to do operations on factors in data frames? I know R has I() but that didn't help in this case. Thanks so much.


      
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