MATLAB: Delete rows from matrix

Question

 I have a bunch of data:
 [1  1
0  0
2  6
3  5
5  55
6  56
0  0
7  69
11  2
0  0 ]

I want to remove all rows with values 0 in the first column. How should I do this? The above is just a part of the data. The data has way more rows than that.

Answer 1

Just use some basic MATLAB logical indexing:

>> X = M(M(:,1)~=0,:)
X =
    1    1
    2    6
    3    5
    5   55
    6   56
    7   69
   11    2