adding values in array

Hi suppose I have two variable

idx1=

1

2

3

idx2=

4

5

I need to have a third variable idx3 where idx3=

1

2

3

4

5

NB. idx1 and idx2 are linear indices and idx3 is the indices having all idx1 and idx2

Answer 1

[Yoav Livneh]

If idx1 and idx2 are row vectors you can do

idx3 = [idx1 idx2];

If they are column vectors do

idx3 = [idx1; idx2];

[Jan]

And if you don't know the orientation of the vectors: idx3 = cat(1, idx1(:), idex2(:)).