>> C = [-1 0 0; 1 1 0; 0 0 2]

C =

    -1     0     0
     1     1     0
     0     0     2

>> B = [1.5 3.1];
>> S = [3.0 B]

S =

    3.0000    1.5000    3.1000

>> S(2) = 5.5;
>> S

S =

    3.0000    5.5000    3.1000

>> S(4) = 7.2;
>> S

S =

    3.0000    5.5000    3.1000    7.2000

>> M = [1 2 3 4 5;        2 3 4 5 6;
3 4 5 6 7];
>> M

M =

     1     2     3     4     5
     2     3     4     5     6
     3     4     5     6     7

>> X = M(: , 1)

X =

     1
     2
     3

>> Y = M(: , 4)

Y =

     4
     5
     6

>> Z = M(1 , :)

Z =

     1     2     3     4     5

>> W = M(2:3, :)

W =

     2     3     4     5     6
     3     4     5     6     7

>> W = M(2:3 , 4:5)

W =

     5     6
     6     7

>> Z = M(2 , 3)

Z =

     4

>>