On Jun 18, 2009, at 9:28 AM, njhuang86 wrote:
Hi all,
Suppose I have a vector like this:
[1] "STAT1" "STAT1" "STAT1" "STAT1" "GAPDH" "GAPDH" "GAPDH"
"ACTB"
"ACTB"
[10] "ACTB" "DDR1" "RFC2" "HSPA6" "PAX8" "GUCA1A" "UBE1L"
"THRA"
"PTPN21"
[19] "CCL5" "CYP2E1" "STAT1" "THRA" "PAX8"
I would like to produce a vector such that it has the same length as
the one
above but it tells me where the duplicates are. So essentially, if I
could
represent each gene symbol as a specific number, and have the
duplicates be
the same number, that would be ideal. Right now, I'm using the unique
command along with two nested for loops to do the job... But it's
really
taking too long... Any suggestions would be greatly appreciated.
Thank you!
Is this what you want?
> Vec
[1] "STAT1" "STAT1" "STAT1" "STAT1" "GAPDH" "GAPDH" "GAPDH"
[8] "ACTB" "ACTB" "ACTB" "DDR1" "RFC2" "HSPA6" "PAX8"
[15] "GUCA1A" "UBE1L" "THRA" "PTPN21" "CCL5" "CYP2E1" "STAT1"
[22] "THRA" "PAX8"
> as.numeric(factor(Vec))
[1] 11 11 11 11 5 5 5 1 1 1 4 10 7 8 6 13 12 9 2 3 11 12
[23] 8
?
HTH,
Marc Schwartz
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