Y = mean_row(X) (Matrix|Array|Index) Y; (Matrix|Array|Index) X;
>> Y = mean_row([[1 2][3 4]])
=== [Y] : ( 2, 1) ===
( 1)
( 1) 1.50000000E+00
( 2) 3.50000000E+00
>> Y = mean_row([[1][3]])
=== [Y] : ( 1, 1) ===
( 1)
( 1) 2.00000000E+00