Matriz unitaria en java

   static void unitaria (int u [] [], int n, int m)

    {    int i, j;

        for (i = 1 ; i <= m ; i++)

        {

            for (j = 1 ; j <= n ; j++)

            {

                if (i == j)

                   u[i][j]=1;

                else

                    u[i][j]=0;

            }

        }

    }