Thanks a lot, it was that i need !!! Works very good ! [EMAIL PROTECTED] wrote: > Roberto Bonvallet: > > What output are you expecting from your example matrix? If you are > > expecting > > it to be 5 (the smallest positive element), using "min" is the way to do it: > > >>> matrix = [[9, 8, 12, 15], > > ... [0, 11, 15, 18], > > ... [0, 0, 10, 13], > > ... [0, 0, 0, 5]] > > >>> min(min(x for x in row if x > 0) for row in matrix) > > 5 > > This looks a bit like homework... > To find the minimal number > 0 of the matrix this seems better: > > mat = [[9, 8, 12, 15], > [0, 11, 15, 18], > [0, 0, 10, 13], > [0, 0, 0, 5]] > > print min(el for row in mat for el in row if el > 0) > > Note that this raises TypeError is the matrix doesn't have one or more > numbers > 0 > If the OP needs the position he/she can do something like: > > nozeromin = 1e300 # or something similar > pos = None, None > > for nrow, row in enumerate(mat): > for ncol, el in enumerate(row): > if el > 0 and el < nozeromin: > nozeromin = el > pos = nrow, ncol > > print nozeromin, pos > > Bye, > bearophile
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