On Saturday, 4 April 2020 at 10:57:36 UTC, MoonlightSentinel wrote: > On Saturday, 4 April 2020 at 09:09:44 UTC, Giovanni Di Maria > wrote: >> Why the followin code gives me the error? >> >> Error: only one index allowed to index `int[3][3]` > > Use matrix[2][2] instead of matrix[2,2]. OK. Thank you very MUCH Giovanni