MATLAB: Finding elements in array

Question

I have an array

vk = [0 0.025 0.05 0.075 0.1 0.125 0.15 0.175].

I am writing this line

op= vk(vk>= 0.05 & vk<= 0.175)

The result which I am getting is

op =

0.0750 0.1000 0.1250 0.1500 0.1750

which is wrong, I should get

0.05 0.0750 0.1000 0.1250 0.1500 0.1750

does anyone know what I am doing wrong?

Also how I can get the indices number of the array vk and of op?

Answer 1

To get the indices to the vk array

vk = [0	0.025	0.05 	0.075	0.1   	0.125 	0.15 	0.175];
[idx] = find(vk>= 0.05 & vk<= 0.175);
op = vk(idx)