how to take a matrix of certain values taken from the matrix

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Muhammad Dzul Akbar
评论： Muhammad Dzul Akbar 2018-8-24
hello guys,
I am a beginner in using matlab, and I have a case which I can't solve it, can anyone help?
I have a 7 x 2 input matrix, as I demonstrated below
A = [1 100
       2 110
       3 120
       4 130
       5 140
       6 150
       7 160]
and then i have a value of 125. from that value i want i get a new matrix that is
B = [3 120
      4 130]
Could someone help me please?
dzulakbar

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采纳的回答

Walter Roberson
Walter Roberson 2018-8-23
q = 125;
idx = interp1(A(:,2), (1:size(A,1)).', q);
B = A(floor(idx):ceil(idx), :);
This relies upon the entries in the second column being monotonic (all increasing or all decreasing.)

更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2018-8-23
编辑：Andrei Bobrov 2018-8-23
q = 125;
[~,inx] = mink(abs(A(:,2) - q),2);
B = A(inx,:);
or for old MATLAB
q = 125;
[~,inx] = sort(abs(A(:,2) - 125));
B = A(inx(1:2),:);

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