Removing matrix rows after the first element of a row becomes too big

I want to remove all of the rows in A after the element of the first column of the nth row passes, say 10. Let A be

A = [ 1  1  1  1  1  1  1  1  1 
      3  3  3  3  3  3  3  3  3 
      4  4  4  4  4  4  4  4  4 
      7  7  7  7  7  7  7  7  7 
      8  8  8  8  8  8  8  8  8 
      10 10 10 10 10 10 10 10 10 
      11 11 11 11 11 11 11 11 11
      25 25 25 25 25 25 25 25 25 ]

 How do I do this without knowing what row the first element will be larger than 10 at?

Answer 1

[Azzi Abdelmalek]

[ii,jj]=find(A>10,1);
A(ii:end,:)=[]

[Sean]

Cheers.