[R] minimum of each row in a matrix
Hallo, I just followed the discussion of the title: minimum from matrix. I have a similar problem. a=matrix(c(0,2, 0, 0, 1, 3, 0, 3, 2, 0, 3, 5, 0, 4, 0, 0),ncol=4) a=rbind(a,1:4) a [,1] [,2] [,3] [,4] [1,]0120 [2,]2304 [3,]0030 [4,]0350 [5,]1234 minOfColumns=apply(a, 2, function(x) min(x[x!=0]) ) minOfColumns [1] 1 1 2 4 maxOfColumns=apply(a, 2, function(x) max(x) ) maxOfColumns [1] 2 3 5 4 How looks like the command for the minimum of the rows? I tried several possibilities with apply but did not get the wanted result. The result should be minOfRows = 0 0 0 0 1 Thanks, Corinna __ 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] minimum of each row in a matrix
Check out the help for apply, particularly the MARGIN argument: minOfRows=apply(a, 1, function(x) min(x[x!=0]) ) maxOfRows=apply(a, 1, function(x) max(x) ) Sarah On 5/8/07, Schmitt, Corinna [EMAIL PROTECTED] wrote: Hallo, I just followed the discussion of the title: minimum from matrix. I have a similar problem. a=matrix(c(0,2, 0, 0, 1, 3, 0, 3, 2, 0, 3, 5, 0, 4, 0, 0),ncol=4) a=rbind(a,1:4) a [,1] [,2] [,3] [,4] [1,]0120 [2,]2304 [3,]0030 [4,]0350 [5,]1234 minOfColumns=apply(a, 2, function(x) min(x[x!=0]) ) minOfColumns [1] 1 1 2 4 maxOfColumns=apply(a, 2, function(x) max(x) ) maxOfColumns [1] 2 3 5 4 How looks like the command for the minimum of the rows? I tried several possibilities with apply but did not get the wanted result. The result should be minOfRows = 0 0 0 0 1 Thanks, Corinna -- Sarah Goslee http://www.functionaldiversity.org __ 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] minimum of each row in a matrix
Looks like you are reading manuals and these mailings insufficiently carefully. ?apply says that if its second argument is 1, it gives you what you want. Gabor Csardi has also written you this. If you have several vectors, not a single matrix, you can use pmin: pmin(a[1,],a[2,],a[3,],a[4,],a[5,]) However, this variant is inefficient in this particular case (lots of typing, and hardcoded). Schmitt, Corinna wrote: Hallo, I just followed the discussion of the title: minimum from matrix. I have a similar problem. a=matrix(c(0,2, 0, 0, 1, 3, 0, 3, 2, 0, 3, 5, 0, 4, 0, 0),ncol=4) a=rbind(a,1:4) a [,1] [,2] [,3] [,4] [1,]0120 [2,]2304 [3,]0030 [4,]0350 [5,]1234 minOfColumns=apply(a, 2, function(x) min(x[x!=0]) ) minOfColumns [1] 1 1 2 4 maxOfColumns=apply(a, 2, function(x) max(x) ) maxOfColumns [1] 2 3 5 4 How looks like the command for the minimum of the rows? I tried several possibilities with apply but did not get the wanted result. The result should be minOfRows = 0 0 0 0 1 -- View this message in context: http://www.nabble.com/minimum-of-each-row-in-a-matrix-tf3709616.html#a10375966 Sent from the R help mailing list archive at Nabble.com. __ 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] minimum of each row in a matrix
Corinna, what about reading my previous mail, which you suggested to forget? Gabor ps. it is apply(a, 1, min) On Tue, May 08, 2007 at 03:21:26PM +0200, Schmitt, Corinna wrote: Hallo, I just followed the discussion of the title: minimum from matrix. I have a similar problem. a=matrix(c(0,2, 0, 0, 1, 3, 0, 3, 2, 0, 3, 5, 0, 4, 0, 0),ncol=4) a=rbind(a,1:4) a [,1] [,2] [,3] [,4] [1,]0120 [2,]2304 [3,]0030 [4,]0350 [5,]1234 minOfColumns=apply(a, 2, function(x) min(x[x!=0]) ) minOfColumns [1] 1 1 2 4 maxOfColumns=apply(a, 2, function(x) max(x) ) maxOfColumns [1] 2 3 5 4 How looks like the command for the minimum of the rows? I tried several possibilities with apply but did not get the wanted result. The result should be minOfRows = 0 0 0 0 1 Thanks, Corinna __ 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. -- Csardi Gabor [EMAIL PROTECTED]MTA RMKI, ELTE TTK __ 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] minimum of each row in a matrix
Hi Peter, thanks for the quick help. Yes it does what I want. Thanks, Corinna Von: Peter Konings [mailto:[EMAIL PROTECTED] Gesendet: Dienstag, 8. Mai 2007 15:29 An: Schmitt, Corinna Betreff: Re: [R] minimum of each row in a matrix Hi Corinna, does apply(a, 1, min) do what you want? HTH Peter. On 5/8/07, Schmitt, Corinna [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] wrote: Hallo, I just followed the discussion of the title: minimum from matrix. I have a similar problem. a=matrix(c(0,2, 0, 0, 1, 3, 0, 3, 2, 0, 3, 5, 0, 4, 0, 0),ncol=4) a=rbind(a,1:4) a [,1] [,2] [,3] [,4] [1,]0120 [2,]2304 [3,]0030 [4,]0350 [5,]1234 minOfColumns=apply(a, 2, function(x) min(x[x!=0]) ) minOfColumns [1] 1 1 2 4 maxOfColumns=apply(a, 2, function(x) max(x) ) maxOfColumns [1] 2 3 5 4 How looks like the command for the minimum of the rows? I tried several possibilities with apply but did not get the wanted result. The result should be minOfRows = 0 0 0 0 1 Thanks, Corinna __ 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. [[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.
