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generating a matrix question

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mohamed
mohamed 2013-12-11
评论： mohamed 2013-12-12
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
Azzi Abdelmalek 2013-12-11
A=zeros(3,4);
[ii,jj]=ind2sub(size(A),1:numel(A));
A(1:end)=sum([ii' jj'],2)
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Azzi Abdelmalek
Azzi Abdelmalek 2013-12-11
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

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Andrei Bobrov
Andrei Bobrov 2013-12-11
编辑：Andrei Bobrov 2013-12-11
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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