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Select a certain number of mine Vector Members in MATLAB

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lech king
lech king on 6 Oct 2020
Commented: lech king on 6 Oct 2020
Hi
I have a 40 x 1 vector. I want to find the location of 20 smaller components of this vector. The position of these members is considered.
Thanks for your guidance

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Accepted Answer

KSSV
KSSV on 6 Oct 2020
Let v be your vector. You can arrange them from small to big order i.e in ascending order and then pick first twenty elements.
[val,idx] = sort(v) ;
val(1:20) % values
idx(1:20) % indices

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lech king
lech king on 6 Oct 2020
thank you
But for me, their position is important. By arranging the vector, their original positions change
Because the goal is to understand the position of these members and then using their position number from another matrix I will select the corresponding rows
KSSV
KSSV on 6 Oct 2020
You already have the indices in your hand as idx which corresponds to original vector. This is not a problem. The positions are according to vector v.

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