generating a matrix question

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

Answer 1

[Azzi Abdelmalek]

A=zeros(3,4);
[ii,jj]=ind2sub(size(A),1:numel(A));
A(1:end)=sum([ii' jj'],2)

[mohamed]

thx very much but i dont understand some of the codes like ind2sub abd nume

[Azzi Abdelmalek]

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

[mohamed]

thank you

Answer 2

[Andrei Bobrov]

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;

[mohamed]

thx very much