How can one find the position of the max value in a matrix in R? Finding the maximum value of a matrix isn't as straight forward as you may think. We can construct a matrix and find the max value:
mat = max(mat)
But we need to get the position of that max value, 11. To do so, we use the powerful which function as follows:
mat w = which(mat == max(mat), arr.ind = TRUE) row = w[1] col = w[2]
How does it work?
We ask which to tell us the location of max(mat), and we ask for the array indices to be returned, which is why we include arr.ind = TRUE. The row and column of the maximum value are now stored in row and col, respectively.