Re: [R] Finding the position of a variable in a data.frame
You don't need to find out the column index. This works: Df[5,'bat'] - 100 -Don At 5:01 PM -0400 8/2/06, 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. -- -- Don MacQueen Environmental Protection Department Lawrence Livermore National Laboratory Livermore, CA, USA __ 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.
Re: [R] Finding the position of a variable in a data.frame
--- Don MacQueen [EMAIL PROTECTED] wrote: You don't need to find out the column index. This works: Df[5,'bat'] - 100 -Don Thanks, I'd tried Df[5, bat] - 100 :( I never thought of the ' ' being needed. At 5:01 PM -0400 8/2/06, 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. -- -- Don MacQueen Environmental Protection Department Lawrence Livermore National Laboratory Livermore, CA, USA -- __ 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.
Re: [R] Finding the position of a variable in a data.frame
On 8/3/06, John Kane [EMAIL PROTECTED] wrote: --- Don MacQueen [EMAIL PROTECTED] wrote: You don't need to find out the column index. This works: Df[5,'bat'] - 100 -Don Thanks, I'd tried Df[5, bat] - 100 :( I never thought of the ' ' being needed. Right -- the quotes are not needed if you use $ but they are needed if you use [. __ 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.
Re: [R] Finding the position of a variable in a data.frame
?which which(Df = 50, arr.ind=T) row col 5 5 4 On 8/2/06, John Kane [EMAIL PROTECTED] 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.
Re: [R] Finding the position of a variable in a data.frame
--- jim holtman [EMAIL PROTECTED] wrote: ?which which(Df = 50, arr.ind=T) row col 5 5 4 I knew it was going to be blinding obvious! I even read ?which somehow misunderstood arr.ind. Thanks again. On 8/2/06, John Kane [EMAIL PROTECTED] 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? __ 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.
Re: [R] Finding the position of a variable in a data.frame
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()? url:www.econ.uiuc.edu/~rogerRoger Koenker email[EMAIL PROTECTED]Department of Economics vox: 217-333-4558University of Illinois fax: 217-244-6678Champaign, 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.
Re: [R] Finding the position of a variable in a data.frame
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? grep(bat, names(Df)) All I want to do is be able to say Df[5,4] - 100 Why not do it this way? Df$bat - replace(Df$bat, Df$bat =50, 100) Is there some way to have function(bat) return the column number: some kind of a colnum() function? I had thought that I had found somthing in library(gdata) matchcols but no luck. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Finding the position of a variable in a data.frame
--- Chuck Cleland [EMAIL PROTECTED] wrote: John Kane wrote: Simple problem but I don't see the answer. I'm trying to clean up some data I have 120 columns in a data.frame. I have one value in a column named blaw that I want to change. How do I find the coordinates. I can find the row by doing a subset on the data.frame but how do I find out here blaw is in columns without manually counting them or converting names(Df) to a list and reading down the list. Simple example cat - c( 3,5,6,8,0) dog - c(3,5,3,6, 0) rat - c (5, 5, 4, 9, 0) bat - c( 12, 42, 45, 32, 54) Df - data.frame(cbind(cat, dog, rat, bat)) Df subset(Df, bat = 50) results cat dog rat bat 5 0 0 0 54 Thus I know that my target is in row 5 but how do I figure out where 'bat' is? grep(bat, names(Df)) Thank you, I have never used grep. More reading :( All I want to do is be able to say Df[5,4] - 100 Why not do it this way? Df$bat - replace(Df$bat, Df$bat =50, 100) Maybe because it is too blinding simple? I'm still thinking in SAS or Systat. A great solution thanks very much 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. -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 __ 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.
Re: [R] Finding the position of a variable in a data.frame
--- 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/~rogerRoger Koenker email[EMAIL PROTECTED]Department of Economics vox: 217-333-4558University of Illinois fax: 217-244-6678Champaign, 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.
Re: [R] Finding the position of a variable in a data.frame
On Wed, 02 Aug 2006 17:12:53 -0400, Chuck Cleland wrote: Why not do it this way? Df$bat - replace(Df$bat, Df$bat =50, 100) Is that any different, performancewise, than the following? Df$bat[Df$bat = 50] - 100 Gerald Jansen ... John Kane wrote: 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)) ... __ 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.
