How can I select a part of a matrix ?

Question

재훈 2022-11-24

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https://ww2.mathworks.cn/matlabcentral/answers/1861098-how-can-i-select-a-part-of-a-matrix

评论： Image Analyst 2022-11-24

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

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Answer 1

Voss 2022-11-24

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https://ww2.mathworks.cn/matlabcentral/answers/1861098-how-can-i-select-a-part-of-a-matrix#answer_1110078

编辑：Voss 2022-11-24

在 MATLAB Online 中打开

B = [1    0.3
  0.6
  0.5
  0.7
  0.2
  0.5
  0.4
  0.5];
idx = B(:,1) > 4 & B(:,2) < 0.6;
Chosen_data = B(idx,:)
Chosen_data = 4×2
0000    0.2000
0000    0.5000
0000    0.4000
0000    0.5000

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재훈 2022-11-24

Thank you ;)

Image Analyst 2022-11-24

@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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