Cut the last n of matrix row ?

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

Answer 1

[Andrei Bobrov]

a = (1:7)'; n = 2;

A = a(1:end - n);

or

a(end - [n-1, 0]) = [];

[Jan]

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) = [];