Cody

# Problem 2585. How to reverse spdiags ?

Solution 502729

Submitted on 18 Sep 2014 by Tim
• Size: 24
• This is the leading solution.
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### Test Suite

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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