[R] problem on using read.csv function

[Joshua Wiley]

Hi Sonia,

This suggests that those columns have something in them that is not
numeric (e.g., "." to represent missing data, text, etc.).  You can
avoid them being converted to factor using:

read.csv("yourfile.csv", stringsAsFactors = FALSE)

however, they will still be character class, not numeric.  You will
then either need to use as.numeric() on those columns, or figure out
what is making R think those are character columns in the first place
and correct that in your CSV file.

Cheers,

Josh

On Thu, Oct 21, 2010 at 7:17 PM, mou sonia <paperhome at gmail.com> wrote:
> Hi,
>
> I'm using read.csv to import a table. But sevel columns are changed to
> factor variables automatically. They are actually numbers not factor levels.
> Why this happened? How can I get the correct table? Thanks a lot.
>
> Sonia
>
>        [[alternative HTML version deleted]]
>
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-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/