From: jim holtman <jholtman_at_gmail.com>

Date: Thu 03 Aug 2006 - 07:10:50 EST

Date: Thu 03 Aug 2006 - 07:10:50 EST

?which

*> which(Df >= 50, arr.ind=T)
*

row col

5 5 4

On 8/2/06, John Kane <jrkrideau@yahoo.ca> wrote:

*>
*

> Simple problem but I don't see the answer. I'm trying

*> to clean up some data
**> I have 120 columns in a data.frame. I have one value
**> in a column named "blaw" that I want to change. How do
**> I find the coordinates. I can find the row by doing a
**> subset on the data.frame but how do I find out here
**> "blaw " is in columns without manually counting them
**> or converting names(Df) to a list and reading down the
**> list.
**>
**> Simple example
**>
**> cat <- c( 3,5,6,8,0)
**> dog <- c(3,5,3,6, 0)
**> rat <- c (5, 5, 4, 9, 0)
**> bat <- c( 12, 42, 45, 32, 54)
**>
**> Df <- data.frame(cbind(cat, dog, rat, bat))
**> Df
**> subset(Df, bat >= 50)
**>
**> ----results
**> cat dog rat bat
**> 5 0 0 0 54
**>
**>
**> Thus I know that my target is in row 5 but how do I
**> figure out where 'bat' is?
**>
**> All I want to do is be able to say
**> Df[5,4] <- 100
**>
**> Is there some way to have function(bat) return the
**> column number: some kind of a colnum() function? I
**> had thought that I had found somthing in
**> library(gdata) matchcols but no luck.
**>
**> ______________________________________________
**> R-help@stat.math.ethz.ch mailing list
**> https://stat.ethz.ch/mailman/listinfo/r-help
**> PLEASE do read the posting guide
**> http://www.R-project.org/posting-guide.html
**> and provide commented, minimal, self-contained, reproducible code.
**>
*

-- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.Received on Thu Aug 03 07:23:12 2006

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