Problem 1024. Doubling elements in a vector

Created by Abdelhak ARESMOUK

Like (66)

Solve Later

Given the vector A, return B in which all numbers in A are doubling. So for:

A = [ 1 5 8 ]

then

B = [ 1 1 5 5 8 8 ]

Solve

Solution Stats

17609 Solutions
8520 Solvers

Last Solution submitted on Nov 24, 2024

Last 200 Solutions

Problem Comments

8 Comments

8 Comments

Show 5 older comments

srisai vangara on 29 Apr 2020

Really found a lot of trouble to find the solution.
But could not find how someone could solve it just using a size of 7.

Sivaramarao B on 7 Jun 2020

good one

Kaiz Merchant on 4 Aug 2020

What matlab functions are useful for this ? (I did it with a loop)

Michael Green on 8 Feb 2021

Good problem if you don't use repelem

Javid Moraveji on 4 Jun 2022

I think the test should also check for column vectors and any vector with special variables Inf and NaN

Mostafa on 30 Dec 2022

Nice problem without using kron function

James Baker on 8 Jan 2024

B = [ A A];
Is a valid answer! Your problem statement says nothing about the element in vector b being in order. Test 2 is correct for only one case.

Bhavik on 17 Feb 2024

Use repelem inbuilt function

Solution Comments

Show comments

Problem Recent Solvers8520

Problem Tags

Community Treasure Hunt

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

Start Hunting!

Problem 1024. Doubling elements in a vector

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers8520

Suggested Problems

More from this Author2

Problem Tags

Community Treasure Hunt

Problem 1024. Doubling elements in a vector

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers8520

Suggested Problems

More from this Author2

Problem Tags

Community Treasure Hunt

Players