Setting threshold on a matrix

Question

arun Dhillon 2019-4-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/455204-setting-threshold-on-a-matrix

评论： arun Dhillon 2019-4-9

采纳的回答： madhan ravi

Hello Everyone

Please help me with the following problem.

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.

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Answer 1

madhan ravi 2019-4-9

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在 MATLAB Online 中打开

m(m(:,3)<.092,:)=[]

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arun Dhillon 2019-4-9

Thanks a lot

madhan ravi 2019-4-9

编辑：madhan ravi 2019-4-9

@arun Dhillon the answer that you accepted assumes less than or equal to whereas your question states less than

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Answer 2

KSSV 2019-4-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/455204-setting-threshold-on-a-matrix#answer_369683

编辑：KSSV 2019-4-9

在 MATLAB Online 中打开

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 2019-4-9

Thank you.

It works very well

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