extending columns and rows of matrix

Hi I have a matrix like

a=[11    12   113    14
   21    22    23    24
   31    32    33    34
   41    42    43    44]

and I want to extend it to

 b=[11    12    13    14  0  0
    21    22    23    24  0  0
    31    32    33    34  0  0
    41    42    43    44  0  0
    0      0     0     0  0  0
    0      0     0     0  0  0]

how can I do that with a one line command? thank you

[EDITED, Jan, code formatted]

[Jan]

@ss: Did you see, that there were no linebreaks in your question? I've formatted this, because it was not clear if a and b are vectors or matrices.

[ss]

they are matrix a is 4*4 and b is 6*6

Answer 1

[Jan]

Or:

a(6,6) = 0;

This fills the rest with zeros automatically.

[ss]

great thanks

Answer 2

[Image Analyst]

Try this

a = [a zeros(1, 14)];

[Image Analyst]

If you have the Image Processing Toolbox, you might be interested in the padarray() function.