Problem 2585. How to reverse spdiags ?

Solution 1675132

Submitted on 16 Nov 2018 by Mu

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Test	Status	Code Input and Output
1	Pass	x = spdiags([1 2 3;4 5 6;7 8 9]); assert(isequal(spdiags(inv_spdiags(x)),x))
2	Pass	b = spdiags(eye(10)); assert(isequal(spdiags(inv_spdiags(b)),b))
3	Pass	x = spdiags([1 2 3;4 5 6]); assert(isequal(spdiags(inv_spdiags(x)),x))
4	Pass	y = spdiags(magic(9)); assert(isequal(spdiags(inv_spdiags(y)),y))
5	Pass	x = spdiags(magic(5)); assert(isequal(spdiags(inv_spdiags(x)),x))
6	Pass	z = spdiags(ones(10)); assert(isequal(spdiags(inv_spdiags(z)),z))
7	Pass	x = spdiags(randi(10,5)); assert(isequal(spdiags(inv_spdiags(x)),x))
8	Pass	x = spdiags(randi(5,[3 2])); assert(isequal(spdiags(inv_spdiags(x)),x))
9	Pass	a = spdiags(zeros(5)); assert(isequal(spdiags(inv_spdiags(a)),a))

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