How can I select a part of a matrix ?

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

Answer 1

[Voss]

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

[재훈]

Thank you ;)

[Image Analyst]

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