[R] how to find indices of particular array elements

From: Jonathan Williams <jonathan.williams_at_pharmacology.oxford.ac.uk>
Date: Mon 17 Oct 2005 - 19:32:20 EST


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



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