change size of matrix without changing number of row and column

Question

fatema saba 2014-12-23

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https://ww2.mathworks.cn/matlabcentral/answers/167820-change-size-of-matrix-without-changing-number-of-row-and-column

评论： fatema saba 2014-12-23

采纳的回答： Andrei Bobrov

Hi I have 4 matrices (A, B, C and D)like my figure:

The first row and column in matrix B, C and D show number of original row and column.

I want to convert matrix B to matrix B' and matrix C to matrix C' and matrix E to matrix E' like following figure:

is there any clue please?

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Answer 1

Andrei Bobrov 2014-12-23

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https://ww2.mathworks.cn/matlabcentral/answers/167820-change-size-of-matrix-without-changing-number-of-row-and-column#answer_163154

在 MATLAB Online 中打开

B = [0 6 7;6 1 0;7 0 1];
C = [0 1 3 5:7;2 0 0 1 0 0; 3 1 0 0 1 0; 8 0 1 0 0 1; 9 0 0 0 0 1];
E = [0 3:7; 8 0 0 1 0 0;9 1 1 0 1 0; 10 0 1 1 1 0; 11 0 1 1 1 1];
[ib,jb] = find(B(2:end,2:end))
[ic,jc] = find(C(2:end,2:end))
[ie,je] = find(E(2:end,2:end))
s = size(A);
P = [(0:11)',[1:7;zeros(s-1)]];
Bt = P;
Bt(sub2ind(s,B(ib+1,1)+1,B(1,jb+1)'+1)) = 1
Ct = P;
Ct(sub2ind(s,C(ic+1,1)+1,C(1,jc+1)'+1)) = 1
Et = P;
Et(sub2ind(s,E(ie+1,1)+1,E(1,je+1)'+1)) = 1

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fatema saba 2014-12-23

在 MATLAB Online 中打开

Thank you very much. It was very beautiful. and also complicated for me. It took hours that I understood it.

I had written something like that But I couldent complete it:

i
columnE=[4 5 6 7 8]
rowE=[9 10 11 12]
q=columnE(1,1)
w=zeros(8,12)
[m,n]=size(w)
for i=1:m*n
  for j=1:m
      if i==q && j==rowE
          w(i,[q+j(n)])=[1]
        else
            w(i)=[0]
        end 
    end
end
[w]