Create a new matrix

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Yamina chbak
Yamina chbak 2022-4-18
评论： Yamina chbak 2022-5-12
Let A a matrix and B a vector defined by :
A=[ 4 2
7 4
3 5
6 8
8 1];
B= [4 6 7 8];
I wish to know how to create a new matrix C which is a part of matrix A but necessary contain an element of the vector B, given by
C = [ 7 4
6 8];
If anyone could help , I'd greaty appreciate it.
  2 个评论
Sam Chak
Sam Chak 2022-4-18
Sounds like an IQ puzzle.
What is the governing rule for the contruction of Matrix ?
A brief glance at Matrix shows that:
C = [A(2,:); A(4,:)]

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采纳的回答

Bruno Luong
Bruno Luong 2022-4-18
Ran in:
A=[ 4 2
7 4
3 5
6 8
8 1];
B= [4 6 7 8];
C = A(all(ismember(A,B),2),:)
C = 2×2
7 4 6 8
  4 个评论
显示 2更早的评论
Bruno Luong
Bruno Luong 2022-5-12
编辑：Bruno Luong 2022-5-12
Ran in:
This code select the first two matched if there is more than 2 (like the last row of A):
A=[ 4 2 5
7 4 3
3 5 1
6 8 1];
B=[5 8 2 6 1];
At = A.';
tf = ismember(At,B);
tf = tf & cumsum(tf,1)<=2;
C = reshape(At(tf),2,[]).'
C = 3×2
2 5 5 1 6 8
Yamina chbak
Yamina chbak 2022-5-12
Yes, thanks you @Bruno Luong I understand this code. Thanks you again

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