call vector in matrix with condition?

2018 3 21
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更新时间：2018 3 21
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Let's say:
A=[1 2 3 10;4 5 6 15;7 8 9 20]
A=
1 2 3 10
4 5 6 15
7 8 9 20
B=[5 6 15;8 9 20]
B=
5 6 15
8 9 20
I want to call array C from A & B. How can?
C=[4;7]

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Guillaume
Guillaume 2018-3-21
What does call array C from A & B actually mean?
You need to explain why C is 2x1 and not some other size, and where the 4 and 7 are derived from A and B.
ha ha
ha ha 2018-3-21
@Guillaume . I just want to call the value from first column in matrix A, If the matrix in column 2:4 in A is equal to matrix B, respectively

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ha ha
ha ha 2018-3-21

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A(ismember(A(:,2:4),B,'rows'),1);

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