[R] Any method to speed up this problem?

[njhuang86]

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!
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