find local max in a matrix

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Fateme Jalali 2016-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/269366-find-local-max-in-a-matrix

编辑： Stephen23 2016-2-22

Hello.I have this matrix

A=[116     3;107     6;114     6;119     6;117     9;120     9;108    15
;113    18;115    18;112    21;111    24]

.I want to detect local maximums from second column and where local max happened that row should be kept in a new matrix. here (112 21) & (111 24) should be saved in matrix B. can any one help me plz?

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Stephen23 2016-2-22

编辑：Stephen23 2016-2-22

@ Fateme Jalali: please stop posting duplicate questions. You have posted this four times so far. It does not help you get an Answer! If you want to give more information just write comments to this Question.

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Answer 1

Image Analyst 2016-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/269366-find-local-max-in-a-matrix#answer_210752

在 MATLAB Online 中打开

You can get the local max with imdilate():

A=[116     3;107     6;114     6;119     6;117     9;120     9;108    15
;113    18;115    18;112    21;111    24]
windowSize = 3;
maxCol2 = imdilate(A(:,2), true(windowSize, 1))

I'm not sure why you have only two rows instead of local max for every row.