Mapping elements of a matrix using a vector array

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AP
AP el 21 de Mayo de 2014
Comentada: Javier el 24 de Mayo de 2017
I have a matrix named A with size N×3. The values of the elements of A ranges from 1 to M. For example, A with size 8×3:
A = [ 1 2 3;
1 4 5;
5 6 7;
1 3 4;
5 6 7;
1 4 7;
4 3 2;
7 8 9]
B is a vector array whose elements are the values of element of A. In the example above, B with size 9×1:
B = [1 2 3 4 5 6 7 8 9]
I have another vector array named C with the size of B with which I want to replace element of B in A. In fact, C represents whether the elements of B in A has repeated more than for example 2. In my example, C with size 9×1:
C = [0 0 0 0 0 0 0 1 1]
Here is the expected result, where the elements 1 to 7 are replaced by 0 and 8 and 9 are replaced by 1:
Anew = [ 0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 1 1]
How can I replace the elements of B in A with its corresponding values using C? Thank you.

Respuesta aceptada

the cyclist
the cyclist el 21 de Mayo de 2014
Editada: the cyclist el 21 de Mayo de 2014
I am not 100% sure of which of the following two possibilities you want, given your example, but I think either
Anew = ismember(A,B(logical(C)))
or
[~,idx] = ismember(A,B);
Anew = C(idx)
is what you want. I think it's the latter.
  1 comentario
Javier
Javier el 24 de Mayo de 2017
The second option matches the expected. Great! Thank you, cyclist

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