--- roger koenker <[EMAIL PROTECTED]> wrote: > it is the well-known wicked which problem: if you > had (grammatically > incorrectly) > thought "... which I want to change" then you might > have been led > to type (in another window): > > ?which > > and you would have seen the light. Maybe that() > should be an alias > for which()?
One also has to understand which and I missed it. I don't think that which is really that grammatically incorrect anymore. Thanks > > url: www.econ.uiuc.edu/~roger Roger > Koenker > email [EMAIL PROTECTED] Department of > Economics > vox: 217-333-4558 University of > Illinois > fax: 217-244-6678 Champaign, IL > 61820 > > > On Aug 2, 2006, at 4:01 PM, John Kane 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. > > ______________________________________________ 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.