Am 21.04.2015 um 13:25 schrieb Riccardo (Jack) Lucchetti: A Jack-style answer might be: You could use <hansl> matrix m1 = {1,2,1,2,1,2} matrix check = selifc( seq(1, cols(m1)), (m1 .>= max(m1)) ) print check </hansl> to get the vector output, but I know that that's not the point of the question and you knew that already. FWIW, (Python's) Numpy's argmax() and argmin() functions explicitly note that: "In case of multiple occurrences of the maximum values, the indices corresponding to the first occurrence are returned." I'd say that's fine, and for other use cases I'd tend to recommend workarounds such as the above. Alternatively, perhaps an optional second argument to the iminr/iminc/imaxc/imaxr functions to request a check for all occurrences? (BTW, it seems suboptimal to me to have four different function names that essentially do the same thing. But probably too late now.) cheers, sven