How can I append to a vector in Octave?
When ever I have to append to a vector I am doing this.
A = [2 3 4]
A = [A; 3 4 5]
I was wondering if there are any inbuilt functions for this or more elegant ways of doing this in Octave.
Answer
The builtin functions are cat, vertcat, and horzcat, found on pages 380-381 of the Octave documentation (v 3.8). They are essentially equivalent to what you have though.
octave:5> A = [2 3 4];
octave:6> A = [A; 3 4 5]
A =
2 3 4
3 4 5
octave:7> B = [4 5 6];
octave:8> B = vertcat(B,[5 6 7])
B =
4 5 6
5 6 7
Another (again equivalent) way would be to directly use matrix indexing (see page 132)
octave:9> C = [6 7 8];
octave:10> C(end+1,:) = [7 8 9]
C =
6 7 8
7 8 9