[R] problem with factor levels

[Jeremy.Shearman]

Hi
      I have a data.frame with 371,718 obs. of 12 variables (see below for
an str). My problem is with V1, a Factor w/ 93144 levels, there should
actually be 93994 levels. Each entry looks like:
comp[number]_c[number]_seq[number]
for example
comp215489_c0_seq40
R is grouping as though the last number is a decimal for some reason, in
other words comp215489_c0_seq40 and comp215489_c0_seq4 are considered to be
the same. My problem is that they are not the same so when I group by this
factor I am losing 800 levels.

Here is an str

'data.frame':	371718 obs. of  12 variables:
 $ V1 : Factor w/ 93144 levels "comp100000_c0_seq1",..: 92271 91685 29 30
1564 1564 1623 91700 91701 91848 ...
 $ V2 : Factor w/ 17162 levels "gi|345842331|ref|NM_001244016.1|",..: 10119
10779 13210 13210 11522 8115 13079 14493 14493 15858 ...
 $ V3 : num  95.5 90.2 98.7 99.2 81.4 ...
 $ V4 : int  335 153 237 122 258 127 306 258 120 177 ...
 $ V5 : int  15 15 3 1 38 19 20 23 5 9 ...
 $ V6 : int  0 0 0 0 4 2 0 0 0 0 ...
 $ V7 : int  1 45 1 43 1 129 1 54 1 70 ...
 $ V8 : int  335 197 237 164 254 254 306 311 120 246 ...
 $ V9 : int  6866 18 3172 3438 67 122 3927 42 346 195 ...
 $ V10: int  7200 170 3408 3559 318 247 4232 299 465 19 ...
 $ V11: num  7e-155 2e-46 4e-125 2e-61 3e-24 ...
 $ V12: num  545 184 446 234 111 69.9 448 329 198 280 ..



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