Re: [R] extract cells by columns/rows from matrix

which(data==max(data),arr.ind=TRUE) gives you the indices of the largest element. which(data==data[order(data)[2]],arr.ind=TRUE) the indices of the second largest. Best Jannis On 04/14/2011 10:23 PM, Nicolas Gutierrez wrote: hi All, I have a matrix Ufi (x by y) 1 2 3 4 5 1 0 0 0 0

[R] extract cells by columns/rows from matrix

hi All, I have a matrix Ufi (x by y) 1 2 3 4 5 1 0 0 0 0 3 2 0 0 0 9 0 3 0 2 0 0 3 4 0 0 1 0 0 5 0 1 0 0 0 And I need the x and y "coordinates" of those cells with maximum values: First: x=4; y=2 (Value=9) Second: x=5; y=3 (value=3) Any help? THANKS! Nic _

[R] extract cells by columns/rows from matrix

Hi All, I have the following matrix Ufi (x by y): Ufin 1 2 3 4 5 6 7 8 9 10 1 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 4 0 0 0 6 0 0 0 0 0 0 5 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 9 0 0 0 7 0 2 0 0 0 0 0 0 0 0 8 0 0 0 0 0 0 0 0 0 0