# How to combine several matrices

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Maryam Hamrahi il 4 Ago 2016
Commentato: Maryam Hamrahi il 4 Ago 2016
Elements of matrix B are row numbers of matrix A. The row number of matrix A start from 0. Matrix A has several zero rows.
produce matrix C:
when an element of matrix B refer to a zero row of matrix A, the row of matrix B should be replaced with zero.
For instance, I would like to produce Matrix C.
A =
0.0 0.0
0.4 0.8
0.0 0.0
0.2 0.6
B=
1 0
0 2
3 1
2 3
2 1
C=
0 0
0 0
3 1
0 0
0 0
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### Risposta accettata

Guillaume il 4 Ago 2016
It's not clear from your description what happens when one of the column of a row of A is 0 and the other isn't.
This is one way to produce the output you want
C = B;
C(any(A(B+1) == 0, 2), :) = 0
Note that the output of
C = B;
C(A(B+1) == 0) = 0
would have made more sense to me.
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Maryam Hamrahi il 4 Ago 2016
Many thanks Guillaume.
This answer is correct.
C = B;
C(any(A(B+1) == 0, 2), :) = 0

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