How to became my Tridiagonal matrix

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PRED LIU
PRED LIU 2020-7-7
回答： Walter Roberson 2020-7-8
B=[
16, 2 , 3, 13;...
5 , 11, 10, 8;...
9 , 7 , 6, 12;...
4, 14, 15, 1]
How to became my Tridiagonal matrix
16 0 0 0
5 2 0 0
9 11 3 0
4 7 10 13
0 14 6 8
0 0 15 12
0 0 0 1
  1 个评论
Dana
Dana 2020-7-7
If you want help. you should provide a much more detailed question. I have no idea what you're asking here.

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采纳的回答

Walter Roberson
Walter Roberson 2020-7-8
full(spdiags(B',0:-1:-3,7,4))

更多回答（2 个）

KSSV
KSSV 2020-7-8
Read about diag.
iwant = diag(1:5)+diag(1:4,-1)+diag(1:4,1) ;
madhan ravi
madhan ravi 2020-7-8
[m, n] = size(B);
ix = (1 : 2*m : n*2*m) + (0 : n - 1).';
Wanted = zeros(2*m - 1 , n);
Wanted(ix) = B

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