Problem 729. Flag largest magnitude swings as they occur

Created by Doug Hull

Solve Later

You have a phenomenon that produces strictly positive or negative results.
delta = [1 -3 4 2 -1 6 -2 -7];
Marching through this list from beginning to end, mark a value with -1 if it is the greatest magnitude negative yet seen (strictly greater, not equal). Mark it with a one if it has the greatest magnitude in the positive direction (strictly greater, not equal). Just use a 0 if neither of these conditions have been met.
The result for the above example would be:
result = [1 -1 1 0 0 1 0 -1]

Solve

Solution Stats

1782 Solutions
678 Solvers

Last Solution submitted on Sep 18, 2024

Last 200 Solutions

Problem Comments

4 Comments

4 Comments

Show 1 older comment

Kevin Hellemans on 18 Sep 2013

The phrasing might be a bit ambiguous, as magnitude swing could also be thought of as delta(i-1)-delta(i) instead of just delta(i). Nonetheless fun problem!

Abhishek Jain on 16 Sep 2016

Nice question.

Abir Hasan on 1 Aug 2018

Nice problem

Josh on 7 Aug 2023

Agreed with first comment, it would be helpful to have more specificity with definition of magnitude "swing" ...perhaps the word "swing" is confusing because it implies some kind of reference point or change from one point to the next, when all that's being considered is the magnitude of each progressive value in comparison to previous max_magnitudes(+ and -)

Solution Comments

Show comments

Problem Recent Solvers678

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 729. Flag largest magnitude swings as they occur

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers678

Suggested Problems

More from this Author51

Problem Tags

Community Treasure Hunt

Problem 729. Flag largest magnitude swings as they occur

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers678

Suggested Problems

More from this Author51

Problem Tags

Community Treasure Hunt

Players