finding Missing elements in a vector

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Raghavendra Reddy P
评论： Raghavendra Reddy P 2015-5-26
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.

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采纳的回答

Luca Amerio
Luca Amerio 2015-5-26
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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更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2015-5-26
out = P([1;diff(P)] < 0);
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