generating a matrix question
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i want to generate a matrix that each element is the sum of its row and column ive tried usin the henkel command but it didnt work is there an alternative or more simple solution thx
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Azzi Abdelmalek
le 11 Déc 2013
A=zeros(3,4);
[ii,jj]=ind2sub(size(A),1:numel(A));
A(1:end)=sum([ii' jj'],2)
3 commentaires
Azzi Abdelmalek
le 11 Déc 2013
A=[20 4;3 5]
numel(A) % is number of element in A
ans=
4
A(1)
A(2)
A(3)
A(4)
1,2,3 and 4 are linear indices. to get subscripts use ind2sub
ii=[1 2 1 2] rows N°
jj=[1 1 2 2] column N°
Look at
doc numel
doc ind2sub
Plus de réponses (1)
Andrei Bobrov
le 11 Déc 2013
Modifié(e) : Andrei Bobrov
le 11 Déc 2013
s = [3 4];% let s - size new matrices
A = hankel(2:s(1)+1,s(1)+1:sum(s));
or
A = bsxfun(@plus,(1:s(1))',1:s(2));
or
s = [3 4];
[ii,jj] = ndgrid(1:s(1),1:s(2));
A = ii + jj;
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