# create a 4x4 matrix with random values smallmatrix = matrix(runif(16)*10, ncol = 4, nrow = 4)
# get the row and column number of the item in the matrix with the highest value which(smallmatrix == max(smallmatrix), arr.ind = 1) HTH, Martin --- Jonathan Williams <[EMAIL PROTECTED]> wrote: > Dear R helpers, > > I have a largish matrix (1300 x 1300) and I wish to > find the row and column > numbers that identify particular elements whose > values I know in advance > (for example, the row and column numbers for the > maximum value of the > matrix). > > I have looked in the help manual and found the > functions 'row' and 'col' for > finding the indices of a matrix. But, I can't figure > out how to use them to > obtain the indices of the matrix element with > maximum value, despite over an > hour of trying! > > Many thanks for your help, > > Jonathan Williams > > ______________________________________________ > 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 > __________________________________ Access over 1 million songs. Try it free. ______________________________________________ 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