How to find differences of 2 matrices which contain other matrices as elements?

Question

Ege Tunç 2020-12-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/692850-how-to-find-differences-of-2-matrices-which-contain-other-matrices-as-elements

回答： Jan 2020-12-15

o1 = eye(3,3);
o6=[1 -1 0; 1 0 0; 0 0 1];
o3=[0 -1 0;1 -1 0 ;0 0 1];
o2=[-1 0 0 ;0 -1 0; 0 0 1];
o3m=[-1 1 0; -1 0 0 ; 0 0 1];
o6m=[0 1 0; -1 1 0 ; 0 0 1];
omxx=[0 -1 0;-1 0 0; 0 0 1];
omx=[-1 1 0; 0 1 0; 0 0 1];
omy=[1 0 0 ;1 -1 0 ;0 0 1];
omxmx=[0 1 0;1 0 0; 0 0 1];
omx2x=[1 -1 0; 0 -1 0; 0 0 1];
om2xx=[-1 0 0 ; -1 1 0; 0 0 1];
G={o1,o6,o3,o2,o3m,o6m,omxx,omx,omy,omxmx,omx2x,om2xx};
labelsG={"o1","o6","o3","o2","o3m","o6m","omxx","omx","omy","omxmx","omx2x","om2xx"};
H={o1,o2};
labelsH={"o1","o2"};
K=setdiff(G,H);

Here my code. I want to find differences of G and H as J=[o6,o3,o3m,o6m,omxx,omx,omy,omxmx,omx2x,om2xx]

But it's not working

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Answer 1

Jan 2020-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/692850-how-to-find-differences-of-2-matrices-which-contain-other-matrices-as-elements#answer_574495

编辑：Jan 2020-12-14

在 MATLAB Online 中打开

function [AA, AI] = CellDiff(A, B)
nA = numel(A);
nB = numel(B);
M  = false(1, nA);   % Typo fixed, thanks Paul
for iA = 1:nA
   for iB = 1:nB
       if isequal(A{iA}, B{iB})
          M(iA) = true;
          break;
       end
   end
end
AI = find(~M);
AA = A(AI);
end

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Paul 2020-12-14

Should M be initialized to either zeros or false?

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Answer 2

Jan 2020-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/692850-how-to-find-differences-of-2-matrices-which-contain-other-matrices-as-elements#answer_575920

在 MATLAB Online 中打开

The main problem is the choice of the data representation. Using an indexed field would allow to call setdiff().

Data.o1 = eye(3,3);
Data.o6 = [1 -1 0; 1 0 0; 0 0 1];
Data.o3 = [0 -1 0;1 -1 0 ;0 0 1];
Data.o2 = [-1 0 0 ;0 -1 0; 0 0 1];
Data.o3m = [-1 1 0; -1 0 0 ; 0 0 1];
Data.o6m = [0 1 0; -1 1 0 ; 0 0 1];
Data.omxx = [0 -1 0;-1 0 0; 0 0 1];
Data.omx = [-1 1 0; 0 1 0; 0 0 1];
Data.omy = [1 0 0 ;1 -1 0 ;0 0 1];
Data.omxmx = [0 1 0;1 0 0; 0 0 1];
Data.omx2x = [1 -1 0; 0 -1 0; 0 0 1];
Data.om2xx = [-1 0 0 ; -1 1 0; 0 0 1];
G = {"o1","o6","o3","o2","o3m","o6m","omxx","omx","omy","omxmx","omx2x","om2xx"};
H = {"o1","o2"};