How to sort the matrix according to specific row?

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I have a population generated by pop=[pop;x;y;z;cst,fr]; where first 4 rows are x, second 3 rows are y and third 8 rows are z. cst is sum of column 1 and fr is calculated failure rate of column 2.
6 0.876
5 0.99
3 0.939
6 0.876
4 0.837
7 0.959
4 0.953
4 0.873
0 0
5 0.95
3 0.855
4 0.873
4 0.873
5 0.95
6 0.951
66 0.00032352
6 0.876
6 0.876
6 0.965
6 0.965
4 0.953
4 0.837
4 0.953
0 0
3 0.855
6 0.951
5 0.95
0 0
0 0
3 0.855
6 0.951
59 0.00038143
6 0.965
5 0.888
6 0.965
3 0.863
7 0.889
7 0.959
4 0.953
7 0.915
6 0.968
3 0.855
3 0.855
8 0.942
4 0.873
3 0.855
8 0.942
80 0.0002327
How can I sort the specific (16,32,48) rows followed by unchanged (1:15,17:31,33:47)? for example:
6 0.876
6 0.876
6 0.965
6 0.965
4 0.953
4 0.837
4 0.953
0 0
3 0.855
6 0.951
5 0.95
0 0
0 0
3 0.855
6 0.951
59 0.00038143
6 0.876
5 0.99
3 0.939
6 0.876
4 0.837
7 0.959
4 0.953
4 0.873
0 0
5 0.95
3 0.855
4 0.873
4 0.873
5 0.95
6 0.951
66 0.00032352
6 0.965
5 0.888
6 0.965
3 0.863
7 0.889
7 0.959
4 0.953
7 0.915
6 0.968
3 0.855
3 0.855
8 0.942
4 0.873
3 0.855
8 0.942
80 0.0002327
Please help!

Accepted Answer

sixwwwwww
sixwwwwww on 8 Dec 2013
Edited: sixwwwwww on 9 Dec 2013
you can do it as follow:
For example you have your data in variable A then use following line to do it:
A(16:16:end, :) = sortrows(A(16:16:end, :), 1);
I hope it helps. Good luck!
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