On May 2, 2010, at 2:10 PM, Mohan L wrote:
I have no way to determining _why_ it is not numeric, but it simply
is ... not. Your input method turned it into a factor. Perhaps there
was one missing delimiter, or there was a stray character in one of
the entries in the file. Who knows. Why waste time arguing? Follow
the directions for fixing the problem.
Hi David,
Thanks for your time.
I thinks it works now.
> str(assame$Login)
Factor w/ 419 levels ".00","1.00","10.00",..: 114 283 217 216 14 1
2 2 407 327 ...
> is.numeric(assame$Login)
[1] FALSE
>as.numeric(assame$Login) //convert to numerics
NOOOOooooooo. You did not do what what I suggested earlier. Do not
reach for your keyboard in the R console until you have read the FAQ
section regarding converting factors to numeric. If you don't want to
read the FAQ, but instead want to read the help page then type:
?factor # and read slowly and carefully until you finish
the page.
Those two sites of information are slightly different but both "work".
I happen to think you should bring up the FAQ and read the rest of it
as well.
> str(as.numeric(assame$Login))
num [1:35943] 114 283 217 216 14 1 2 2 407 327 ...
the I did some thing like this :
> avglog <- with(assame, tapply(as.numeric(Login), stdate, mean) )
> avglog
01/11/09 00:00 02/11/09 00:00 03/11/09 00:00 04/11/09 00:00 05/11/09
00:00
145.0176 135.5207 133.0390 131.1457
132.3732
06/11/09 00:00 07/11/09 00:00
129.6357 133.4521
Am I right ?
Thanks & Rg
Mohan L
David Winsemius, MD
West Hartford, CT
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