Re: [R] Adding same items together in data.frame

2011-05-16 Thread wong, honkit (Stephen)
Stem Cell Research Building, Room G2035 259 Campus Drive Stanford, CA 94305 -Original Message- From: Dennis Murphy [mailto:djmu...@gmail.com] Sent: Friday, May 13, 2011 8:05 PM To: wong, honkit (Stephen) Cc: r-help@r-project.org Subject: Re: [R] Adding same items together in data.frame

Re: [R] Adding same items together in data.frame

2011-05-14 Thread John Kane
mydata)) = --- On Fri, 5/13/11, wong, honkit (Stephen) wrote: > From: wong, honkit (Stephen) > Subject: [R] Adding same items together in data.frame > To: r-help@r-project.org > Received: Friday, May 13, 2011, 7:06 PM > Dear All, > I am new to R. I have a 2 col

Re: [R] Adding same items together in data.frame

2011-05-13 Thread Steve Lianoglou
Hi, On Fri, May 13, 2011 at 7:06 PM, wong, honkit (Stephen) wrote: > Dear All, > I am new to R. I have a 2 column data frame with more than ten thousand > rows. Something like below. I want to add up all duplicated items, e.g. the > three "aa" add up together to get a single value gene=a, value=7

Re: [R] Adding same items together in data.frame

2011-05-13 Thread Dennis Murphy
Hi: There are many ways to do this sort of thing in R; one way is (naming your example data frame d) aggregate(value ~ gene, data = d, FUN = sum) gene value 1 aa74 2 bb10 3 cc 9 4 dd 100 5 ee55 This code line works for R-2.11.0 and later. HTH, Dennis On Fri, May 1

[R] Adding same items together in data.frame

2011-05-13 Thread wong, honkit (Stephen)
Dear All, I am new to R. I have a 2 column data frame with more than ten thousand rows. Something like below. I want to add up all duplicated items, e.g. the three "aa" add up together to get a single value gene=a, value=74. How can I do that?? Thanks for help ! gene value aa 20 bb 10 cc