indcol <- rep(1:ncol(mat), each=nrow(mat))[which.max(mat)] indrow <- rep(1:nrow(mat), ncol(mat))[which.max(mat)]
indrow <- which(apply(mat==max(mat),1,sum)!=0) indcol <- which(apply(mat==max(mat),2,sum)!=0) Michael a écrit : >Hi all, > >I want to use "which.max" to identify the maximum in a 2D array/matrix and I >want "argmin" and return the row and column indices. > >But "which.max" only works for vector... > >Is there any convinient way to solve this problem? > >Thanks a lot! > > [[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 > > > ______________________________________________ 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