Problem 729. Flag largest magnitude swings as they occur

Solution 778930

Submitted on 15 Nov 2015 by Alberto Comin

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yurenchu on 2 Oct 2017

Flawed solution; fails when delta(1)<delta(1). (For example: when delta = [-2, 1, 3, -4, -5], or when delta = [4,3,2,1,-1].)

Test	Status	Code Input and Output
1	Pass	%% delta = [1 -3 4 2 -1 6 -2 -7] peaks = [1 -1 1 0 0 1 0 -1] assert(isequal(magnitude_swing(delta),peaks)) delta = 1 -3 4 2 -1 6 -2 -7 peaks = 1 -1 1 0 0 1 0 -1
2	Pass	%% delta = [1 4 5 -2 1 7 -4 -6 5 3] peaks = [1 1 1 -1 0 1 -1 -1 0 0] assert(isequal(magnitude_swing(delta),peaks)) delta = 1 4 5 -2 1 7 -4 -6 5 3 peaks = 1 1 1 -1 0 1 -1 -1 0 0
3	Pass	%% delta = [1 4 5 -2 1 7 7 -4 -6 5 3] peaks = [1 1 1 -1 0 1 0 -1 -1 0 0] assert(isequal(magnitude_swing(delta),peaks)) delta = 1 4 5 -2 1 7 7 -4 -6 5 3 peaks = 1 1 1 -1 0 1 0 -1 -1 0 0

Test

Status

Code Input and Output

Pass

%% delta = [1 -3 4 2 -1 6 -2 -7] peaks = [1 -1 1 0 0 1 0 -1] assert(isequal(magnitude_swing(delta),peaks))

delta = 1 -3 4 2 -1 6 -2 -7 peaks = 1 -1 1 0 0 1 0 -1

Pass

%% delta = [1 4 5 -2 1 7 -4 -6 5 3] peaks = [1 1 1 -1 0 1 -1 -1 0 0] assert(isequal(magnitude_swing(delta),peaks))

delta = 1 4 5 -2 1 7 -4 -6 5 3 peaks = 1 1 1 -1 0 1 -1 -1 0 0

Pass

%% delta = [1 4 5 -2 1 7 7 -4 -6 5 3] peaks = [1 1 1 -1 0 1 0 -1 -1 0 0] assert(isequal(magnitude_swing(delta),peaks))

delta = 1 4 5 -2 1 7 7 -4 -6 5 3 peaks = 1 1 1 -1 0 1 0 -1 -1 0 0