New line inside for loop

Hi, I have a large matrix, and what I want to do is pick out first 3 elements of each row, transpose and stack on top of each other, so just have one column at the end...

for example: if i start with this matrix:

1 2 3 4 5
6 7 8 9 10
11 12 13 14 15

I want to end up with this column:

1
2
3
6
7
8
11
12
13

My problem is: how do I put the pointer on a new line at the end of for loop?

test=load('test.txt');    
for i=1:length(test(:,1))
HX1=test(i:i,1:3)'
\n   <------ this is not working .... 
end

Answer 1

[Walter Roberson]

reshape(test(:,1:3).',[],1)

[Baba]

Thank You!!!