# Setting threshold on a matrix

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arun Dhillon on 9 Apr 2019
Commented: arun Dhillon on 9 Apr 2019
Hello Everyone
I have an n*3 matrix, for instance the values in the matrix(m) are
m=
123 256 0.112
231 256 0.081
321 242 0.091
222 242 0.213
Further all the values should stay always with respect to each other, because the first column refers to x coordinates , the second one refers to y coordinates and third one
is like a weight asscociated to that particular object on any x,y coordinates.
So is there a way in which I can set a threshold on 3rd column such that in matrix m, all the values that are less than 0.092 should be ignored or removed from the matrix m, and also the coresponding
values in column 2 and column 1 should be removed as well. So in the matrix m 2nd and 3rd row should be removed and the new matrix will be a 2*3 matrix. Please help me with the same.

madhan ravi on 9 Apr 2019
m(m(:,3)<.092,:)=[]
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madhan ravi on 9 Apr 2019
@arun Dhillon the answer that you accepted assumes less than or equal to whereas your question states less than

### More Answers (1)

KSSV on 9 Apr 2019
Edited: KSSV on 9 Apr 2019
Let A be your m*3 matrix.
A(A(:,3)<=0.092,:) = [] ; % remove rows from A where third column is less than or equal 0.092
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arun Dhillon on 9 Apr 2019
Thank you.
It works very well