creating a new matrix from an obtained matix?

Hello. If I already have a matrix [1 2 3; 4 5 6; 7 8 9], how can I add 0 to its every row by a command?

Thank you.

Answer 1

[Alan Stevens]

Something like:

M = [1 2 3; 4 5 6; 7 8 9];
Mplus = [M zeros(3,1)]

Mplus =

     1     2     3     0
     4     5     6     0
     7     8     9     0

Alwys assuming you want the zeros as the last column.

Answer 2

[metin yilmaz]

Thank you Alan Stevens but what If I wanted 2s, or twos, as the first column instead of 0s, or zeros, as the last one?

[Alan Stevens]

Mplus =[2*ones(3,1) M]

[metin yilmaz]

Can you also do it in this way: M=[2*ones(3,1) M]? If not, why?

Thank you.

[Alan Stevens]

Yes, that works ok.

[metin yilmaz]

Would you please explain how to add a new column as the third one inside your matrix, sliding your previous 3th, and 4th and 5th to the right? That is you will have a new matrix having one more column.

Thank you.

[Alan Stevens]

Try:

M = [M(:,1:2) 2*ones(3,1) M(:,3:end)];