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ans =
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(1, 1) + (2, 2) + (2, 3)
ans =
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X = diag(v) X v .
X = diag(v, k) X length(v)+abs(k) v k- .
v = diag(X) X .
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:
diag(diag(X)) - ;
sum(diag(X)) - X.
diag(-m: m) + diag(ones(2*m, 1), 1) + diag(ones(2*m, 1), -1)
2*m + 1.
m = 3 : m = 3;
diag(-m:m)+diag(ones(2*m,1),1)+diag(ones(2*m,1),-1)
ans =
-3 | 1 | 0 | 0 | 0 | 0 | 0 | |
1 | -2 | 1 | 0 | 0 | 0 | 0 | |
0 | 1 | -1 | 1 | 0 | 0 | 0 | |
0 | 0 | 1 | 0 | 1 | 0 | 0 | |
0 | 0 | 0 | 1 | 1 | 1 | 0 | |
0 | 0 | 0 | 0 | 1 | 2 | 1 | |
0 | 0 | 0 | 0 | 0 | 1 | 3 | |