Cody

# Problem 2585. How to reverse spdiags ?

Solution 2178768

Submitted on 27 Mar 2020 by Asif Newaz
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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))

pp = 3

2   Pass
b = spdiags(eye(10)); assert(isequal(spdiags(inv_spdiags(b)),b))

pp = 1

3   Pass
x = spdiags([1 2 3;4 5 6]); assert(isequal(spdiags(inv_spdiags(x)),x))

pp = 2 3

4   Pass
y = spdiags(magic(9)); assert(isequal(spdiags(inv_spdiags(y)),y))

pp = 9

5   Pass
x = spdiags(magic(5)); assert(isequal(spdiags(inv_spdiags(x)),x))

pp = 5

6   Pass
z = spdiags(ones(10)); assert(isequal(spdiags(inv_spdiags(z)),z))

pp = 10

7   Pass
x = spdiags(randi(10,5)); assert(isequal(spdiags(inv_spdiags(x)),x))

pp = 5

8   Pass
x = spdiags(randi(5,[3 2])); assert(isequal(spdiags(inv_spdiags(x)),x))

pp = 2 3

9   Pass
a = spdiags(zeros(5)); assert(isequal(spdiags(inv_spdiags(a)),a))

pp = []

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