# How to extract matrix from a bigger matrix based on threshold of each column?

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### Accepted Answer

Philippe Lebel
on 2 Dec 2019

Edited: Philippe Lebel
on 2 Dec 2019

here is my try based on what i understood.

given a matrix a nx3:

a = [5,6,8;1,2,3;2,3,4;3,4,5;4,5,6]

a =

5 6 8

1 2 3

2 3 4

3 4 5

4 5 6

% the threshold on column 1 is 2

a_1 = a(a(:,1)>2,:)

a_1 =

5 6 8

3 4 5

4 5 6

% the treshold on column 2 is 4

a_2 = a_1(a_1(:,2)>4,:)

a_2 =

5 6 8

4 5 6

%the treshold on column 3 is 6

a_3 = a_2(a_2(:,3)>6,:)

a_3 =

5 6 8

a_3 is the matrix containing the row(s) that satisfy all tresholds.

A one-liner can be made for this operation:

a_tresh = a((a(:,1)>2)&(a(:,2)>4)&(a(:,3)>6),:)

a_tresh =

5 6 8

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