On May 31, 2009, at 12:03 PM, David Winsemius wrote:
On May 31, 2009, at 10:49 AM, Hongyuan Cao wrote:
x = read.table("hongyuan_5_30_forsafe.txt", sep = "\t")
> x = read.table("/Users/davidwinsemius/Downloads/
hongyuan_5_30_forsafe.txt", sep = "\t")
> str(x)
'data.frame': 7131 obs. of 74 variables:
$ V1 : Factor w/ 7131 levels "","A28102_at",..: 1 934 120 122 118
126 124 130 128 134 ...
$ V2 : Factor w/ 5528 levels "","2-Sep","6-Mar",..: 1 5528 NA NA NA
NA NA NA NA NA ...
$ V3 : Factor w/ 2375 levels "-1","-10","-100",..: 2374 2375 195 106
499 2262 287 483 1254 143 ...
$ V4 : Factor w/ 2326 levels "-1","-10","-100",..: 2325 2326 75 533
1 1442 231 357 299 117 ...
My guess (which became a conclusion after testing) was that you have
encountered the stringsAsFactors pitfall. (It's probably in the R
Inferno someplace but my favorite quote is from Terry Terneau(sic):
The default action of turning every character string into a factor is
a plague on the S language.
---Terry Therneau, from s-news, 2004
--
David Winsemius
Heritage Laboratories
West Hartford, CT
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