How can I select a part of a matrix ?

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재훈
재훈 on 24 Nov 2022
Commented: Image Analyst on 24 Nov 2022
I want to select the component of this matrix, whose first column value is bigger than 4, and the second column value is smaller than 0.6
B =
1.0000 0.3000
2.0000 0.6000
3.0000 0.5000
4.0000 0.7000
5.0000 0.2000
6.0000 0.5000
7.0000 0.4000
8.0000 0.5000
The code below is mine, but it never works,:( please help me.
Chosen_data=[];
for i=1:8;
Chosen_data=B((B(i,1)>4)&(B(i,2)<0.6));
end

Accepted Answer

Voss
Voss on 24 Nov 2022
Edited: Voss on 24 Nov 2022
B = [1 0.3
2 0.6
3 0.5
4 0.7
5 0.2
6 0.5
7 0.4
8 0.5];
idx = B(:,1) > 4 & B(:,2) < 0.6;
Chosen_data = B(idx,:)
Chosen_data = 4×2
5.0000 0.2000 6.0000 0.5000 7.0000 0.4000 8.0000 0.5000
  2 Comments
Image Analyst
Image Analyst on 24 Nov 2022
@재훈 If this Answer solves your original question, then could you please click the "Accept this answer" link to award the answerer with "reputation points" for their efforts in helping you? They'd appreciate it. Thanks in advance. 🙂 Note: you can only accept one answer (so pick the best one) but you can click the "Vote" icon for as many Answers as you want. Voting for an answer will also award reputation points.

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