Problem 54775. Flip the parity of digits in a decimal expansion

The number 349 has the decimal expansion 3*100+4*10+9*1. If we change the even digits from positive to negative, then the number becomes 269 (i.e., 300-40+9). A similar operation could be applied to the odd digits.
Write a function that takes a number n and produces two arrays: a vector a with the even digits of 1 to n with flipped parity and a vector b with the odd digits of 1 to n with flipped parity.
At first these sequences did not seem interesting, but plotting them--using plot(a,1:n,b,1:n) with n = 10^4, say—convinced me that they are.
Solve

Solution Stats

100.0% Correct | 0.0% Incorrect
Last Solution submitted on Dec 07, 2025

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers6

Suggested Problems

More from this Author316

Problem Tags

interesting plot sequence

Community Treasure Hunt

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

Start Hunting!