# how i can find index of each element

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Mohamuud hassan on 21 May 2015
Commented: Andrei Bobrov on 21 May 2015
hello all; i have one problem which
Ex_BWLasColum=[14;20;2;16;1;1;8;1;1;1;1;6;1;1;17;2;24;2;25;8;9;1;1;1;1;1;3;1;1;1;1;1;1;1;1;1];
Ex_BWFirscolm=[1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;2;2;2;3;6;8;8;9;14;16;17;20;24;25];
how i can find index of each element of Ex_BWFirscolm from Ex_BWLasColum.

Andrei Bobrov on 21 May 2015
[~,ii] = sort(Ex_BWLasColum);
Thorsten on 21 May 2015
i.e., in the case where Ex_BWLasColum contains no elements that are not contained in Ex_BWFirscolm.
Andrei Bobrov on 21 May 2015
yes

the cyclist on 21 May 2015
Edited: the cyclist on 21 May 2015
[tf,loc] = ismember(Ex_BWFirscolm, Ex_BWLasColum);
(Or maybe switch the input arguments. I'm not sure which way you meant.)
tf is a boolean that indicates whether the element is present, and loc is an index that tells you the location. It sounds like you want loc.
Mohamuud hassan on 21 May 2015
Edited: Mohamuud hassan on 21 May 2015
thank you the cyclist; the output:
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
3
3
3
27
12
7
7
21
1
4
15
2
17
19
the first 22 elements was solved according to the element 1 of Ex_BWLasColum so, that was not my point.
my objective is to find first similar element of Ex_BWFirscolm according to similar number in the Ex_BWLasColum. then the second element of Ex_BWFirscolm according to the second similar number in the Ex_BWFirscolm. N.B:
the estimated result is: 5,6,8,9,10,11,........