finding Missing elements in a vector

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I have a vector P =
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
2
19
20
21
3
23
24
6
26
27
28
29
30
31
32
As per the ascending order (1 2...15..32) of vector P, the elements 18,25,28 are missing and their position is occupied by the elements 2,3,6. now i want a vector which indicates this numbers like n=[2 3 6]. if elements are in order perfectly (1:10), I don't want new vector n.

Accepted Answer

Luca Amerio
Luca Amerio on 26 May 2015
This will do the trick
P(~(P==1:length(P)))
just for clarification
P==1:length(P)
returns a logical array of the position occupied by the right number.
~(P==1:length(P))
is the logical array of the position occupied by the WRONG number
P(~(P==1:length(P)))
get the values in those positions.
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More Answers (1)

Andrei Bobrov
Andrei Bobrov on 26 May 2015
out = P([1;diff(P)] < 0);
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