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R - How to convert a factor to an integer\numeric in R without a loss of information
I am importing an excel document using read.xls. I know this command uses read.table and returns everything as "factors". I am unable to upload my data directly telling read.xls which columns are numeric, as all columns have previous categorical data. So I have been extracting my numeric data columns I desire, then wanting to transform them from data.frames to numeric data, however when I use as.numeric I am receiving numbers that do not correspond to the original data.
For example:
These are the first 6 rows of my data.frame called dfA1, which is a 96,1 vector
[,1]
[1,] "103316"
[2,] "130720"
[3,] "141808"
[4,] "131864"
[5,] "148144"
[6,] "145760"
When I perform as.numeric(dfA1) I receive:
[1] 2 18 29 19 43 40
I have absolutely no idea why I get these numbers or how it could be coming up with them. I checked my original xls document and they are marked as numeric with no decimals.