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extracting data from matrix

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Abdelwahab Fawzy
Abdelwahab Fawzy 2016-7-16
编辑： per isakson 2016-7-16
Hello every bod
let assume matrix
A =
[10 20 1
30 40 2
50 60 3
70 80 4
90 100 5]
B =
[30 40
70 80]
we need to identify the third column of the matrix B, hence
B =
[30 40 2
70 80 4]

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2016-7-16
编辑：Azzi Abdelmalek 2016-7-16
A= [10 20 1
30 40 2
50 60 3
70 80 4
90 100 5]
B=[30 40
70 80]
idx=ismember(A(:,1:2),B,'rows')
B(:,3)=A(idx,3)
  2 个评论
Abdelwahab Fawzy
Abdelwahab Fawzy 2016-7-16
I tried this code for other different matrices I get a problem at which the third column is not compatible with the first and 2'nd column data in terms of ordering
Azzi Abdelmalek
Azzi Abdelmalek 2016-7-16
编辑：Azzi Abdelmalek 2016-7-16
Can you explain? post an example to make your question clear

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