finding neighbouring locations in matrix bigger than a certain value

Question

Johannes Deelstra 2020-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/658763-finding-neighbouring-locations-in-matrix-bigger-than-a-certain-value

编辑： Alan Moses 2020-12-1

Hey

I have a 324 x 1 matrix

I like to find the neighbouring cells having each a value bigger than for example 50

Or how to I find the locations ofg three neighbouring cells bigger than 50

thanks in advance

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Answer 1

Alan Moses 2020-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/658763-finding-neighbouring-locations-in-matrix-bigger-than-a-certain-value#answer_561268

编辑：Alan Moses 2020-12-1

在 MATLAB Online 中打开

You may refer the method used here to find the neighbouring values of an element in a matrix. To find the locations of elements in a vector, you may refer the find function.

You may also refer the example below that finds neighbouring cells for values greater than 50. The code can be modified to find neighbours greater than 50 as well.

>> A = [3;4;8;6;51;5;8;65;9]; % size - 9x1
>> M = zeros(size(A.'));
>> C = find(A>50);
>> M(1,C) = 1;
>> Neighbours = A(conv2(M,[1,1,1;1,0,1;1,1,1],'same')>0)
Neighbours =
     6
     5
     8
     9