How to extract max from a cell?

Question

luisa bertoli 2018-5-17

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回答： KSSV 2018-5-17

Hi, I'm dealing with image/video processing and I would like to extract the area of the biggest connected component for each frame. I have created a cell structure with the areas of each connected component in each frame. The problem is to create a proper "for loop" to store the values of max areas(from each frame) in an array. Then, I would like to do the same thing with mean(s) of pixels' intensity (for the biggest connected component). Any help will be extremely valuable. Thank you, Luisa

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Answer 1

Sandro Lecci 2018-5-17

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Dear Luisa,

maybe the function cellfun does what you are looking for.

A = cell(3,1);
%Store with 3 matrices of different sizes
A{1} = magic(10);
A{2} = rand(20);
A{3} = ones(30);
%Extract the max of all cells
maxA = cellfun(@(X) max(max(X)), A)

Best, Sandro

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Answer 2

KSSV 2018-5-17

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% make some random cell for demo 
A = cell(10,1) ;
for i = 1:10
    A{i} = rand(randperm(10,1),1) ;
end
% get max using loop
iwant = zeros(length(A),1) ;
for i = 1:length(A)
    iwant(i) = max(A{i}) ;
end
% use cellfun
m = cellfun(@max,A) ;
[iwant m]