gathering two cells in confusion matrix

Question

Salma Hassan 2020-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/514861-gathering-two-cells-in-confusion-matrix

编辑： Salma Hassan 2020-4-3

If I have a 4*4 confusion matrix array [1 1 3 2; 1 0 2 1 ; 7 4 3 1; 5 6 3 7]. how can I combining both 2*2 regions are next to each other in order to constract a new array of 2*2 [3 8; 22 14]

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Answer 1

Fangjun Jiang 2020-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/514861-gathering-two-cells-in-confusion-matrix#answer_423594

编辑：Fangjun Jiang 2020-4-2

在 MATLAB Online 中打开

If you have the Image Processing toolbox,

a=[1 1 3 2; 1 0 2 1 ; 7 4 3 1; 5 6 3 7];
fun = @(block_struct) sum(block_struct.data(:));
blockproc(a,[2 2],fun)

ans =

3 8

22 14

if Not,

a=rand(6,9);
RowBlock=2;
m=size(a,1)/RowBlock; % make sure m is an integer
ColBlock=3;
n=size(a,2)/ColBlock; % make sure n is an integer
b=mat2cell(a,repmat(RowBlock,1,m),repmat(ColBlock,1,n));
c=cellfun(@(x) sum(x(:)), b)