Creating Matrix Using Existing Matrix

2015 10 6
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更新时间：2015 10 6
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Hi, How do you create a matrix (not just a plot) that is a horizontal shear of a 2x2 identity matrix? For example, how do you create A=[1 2 ; 0 1] (identity horizontally sheared by 2)? Inputting the entries directly (A=[1 2 ; 0 1]) is not an answer that I'm looking for.
Thank you.

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Walter Roberson
Walter Roberson 2015-10-6

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SheerFactor = 2;
sheermat = eye(2);
sheermat(1,2) = SheerFactor;

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Andrei Bobrov
Andrei Bobrov 2015-10-6

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n - size matrix
full(spdiags(ones(n,1)*(0:2*n-1),1-n:n-1,n,n))
or
rot90(hankel(0:n-1,n-1:2*n-2))

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