On Mon, 2005-09-19 at 12:30 -0700, shanmuha boopathy wrote: > Dear sir, > i have a matrix like > x<-c(1:20) > A<-matrix(x,4,5) > > A > [,1] [,2] [,3] [,4] [,5] > [1,] 1 5 9 13 17 > [2,] 2 6 10 14 18 > [3,] 3 7 11 15 19 > [4,] 4 8 12 16 20 > > I want to extract the column value for the matrix > value 11... > > or the row value for 14.. > how it is possible? > > thanks for your help.... > > with regards, > boopathy.
Why did you copy r-devel? r-help is the appropriate forum. See ?which and take note of the 'arr.ind' argument: > which(A == 11, arr.ind = TRUE) row col [1,] 3 3 > which(A == 14, arr.ind = TRUE) row col [1,] 2 4 HTH, Marc Schwartz ______________________________________________ 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