x = [ [ 1 , 2 , 3 ] , [ 4 , 5 , 6 ] , [ 7 , 8 , 9 ] ] sum = [] for i in ( 0..2 ) do sum[ i ] = 0 for j in ( 0..2 ) do sum[ i ] += x[ j ][ i ] end end for i in ( 0..2 ) do for j in ( 0..2 ) do printf( "%2d " , x[ i ][ j ] ) end printf( "\n" ); end printf( "----------\n" ); for i in ( 0..2 ) do printf( "%2d " , sum[ i ] ) end printf( "\n" );