This should do it, assuming you data is in a data frame called dat:
sel - unique(dat$V1)
ix - match(sel,dat$V1)
dat[ix,]
On 09/02/07, Glazko, Galina [EMAIL PROTECTED] wrote:
Dear list,
I have a table where first 3 columns are identical if the name in the
first column is the same, and
the number in N4 is slightly different for all identical names, like
this:
---
29Mm.1_at 3 + 93649936
30Mm.1_at 3 + 93649990
31Mm.1_at 3 + 93649993
32Mm.1_at 3 + 93650001
33Mm.1_at 3 + 93650010
34 Mm.10_at 4 + 147438101
35 Mm.10_at 4 + 147438192
36 Mm.10_at 4 + 147438214
37 Mm.100043_at 5 + 31602952
38 Mm.100043_at 5 + 31602982
39 Mm.100043_at 5 + 31603000
---
I need to select unique identifiers in column N 1, without paying
attention to what is in column N4, taking the first number in N4
corresponding to first unique ID in N1, like this:
29Mm.1_at 3 + 93649936
34 Mm.10_at 4 + 147438101
37 Mm.100043_at 5 + 31602952
Could someone tell me how to do it without FOR cycle over all IDs in N1?
Thank you!
Best regards
Galina
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