Cut the last n of matrix row ?

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I Made
I Made 2013-3-25
e.g i have matrix a :
1
2
3
4
5
6
7
i want to cut the last 2 row of matrix A ? and become
1
2
3
4
5

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Andrei Bobrov
Andrei Bobrov 2013-3-25
编辑：Andrei Bobrov 2013-3-25
a = (1:7)'; n = 2;
A = a(1:end - n);
or
a(end - [n-1, 0]) = [];
  1 个评论
Jan
Jan 2013-3-25
编辑：Jan 2013-3-25
The 2nd command might be:
a(end - (n-1:0)) = [];
But this would be faster (for large problems), because the vector end-n-1:end is not created explicitly:
a(end-n-1:end) = [];

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