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how to make the numbers on the matrix with alternative sign?

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kingsley
kingsley 2017-2-15
重新打开： kingsley 2017-2-15
I want to create a matrix that the main diagonal of K are alternatively 2 and -2’s, the sub- and sup-diagonal of K alternatively 1 and -1’s, and everywhere else 0. The size of K is 2n by 2n.
Here is what I got so far.
x=ones(1,5);
y=ones(1,4);
x2=2*x;
y2=y*-1;
z=diag(x2,0)
[rows, columns] = size(z)
z(1:2*rows+2:end) = -z(1:2*rows+2:end)
b=diag(y2,+1)
d=diag(y2,-1)
g=z+b+d

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