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sparse mtrix from sparse matrices

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fatema saba
fatema saba 2014-11-26
关闭： MATLAB Answer Bot 2021-8-20
Hi
I have three matrices (a, h and k1) like:
a =
(1,1) 1
(2,2) 1
(3,3) 1
(4,4) 1
(5,5) 1
(6,6) 1
(7,7) 1
(8,8) 1
(9,9) 1
>> h=sparse(n3,n3)
h =
All zero sparse: 9-by-9
>> k1=-4*a
k1 =
(1,1) -4
(2,2) -4
(3,3) -4
(4,4) -4
(5,5) -4
(6,6) -4
(7,7) -4
(8,8) -4
(9,9) -4
I want to create a matrix from these matrices in this form that is sparse.
q=['k1' 'h' 'a' 'h'; 'h' 'k1' 'h' 'a']
How can create that please?
  2 个评论
fatema saba
fatema saba 2014-11-26
Hi
I can find it. it is something like that:
q=sparse([k1,h,a,h;h,k1,h,a])
the cyclist
the cyclist 2014-11-26
I think the concatenation of sparse arrays is sparse, so you probably don't need that sparse command.

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