Problem 6. Select every other element of a vector

Created by Cody Team

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<div style = "text-align: start; line-height: 20.4333px; min-height: 0px; white-space: normal; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: 400; text-decoration: rgb(0, 0, 0); white-space: normal; "><div style="block-size: 184.167px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 407px 92.0833px; transform-origin: 407px 92.0833px; vertical-align: baseline; "><div style="block-size: 42px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 21px; text-align: left; transform-origin: 384px 21px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; "><span style="block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 361.5px 8px; transform-origin: 361.5px 8px; unicode-bidi: normal; "><span style="">Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, starting with the first.</span></span></div><div style="block-size: 21px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 10.5px; text-align: left; transform-origin: 384px 10.5px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; "><span style="block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 32px 8px; transform-origin: 32px 8px; unicode-bidi: normal; "><span style="">Examples:</span></span></div><div style="background-color: rgb(247, 247, 247); block-size: 102.167px; border-bottom-left-radius: 4px; border-bottom-right-radius: 4px; border-end-end-radius: 4px; border-end-start-radius: 4px; border-start-end-radius: 4px; border-start-start-radius: 4px; border-top-left-radius: 4px; border-top-right-radius: 4px; margin-block-end: 10px; margin-block-start: 10px; margin-bottom: 10px; margin-inline-end: 3px; margin-inline-start: 3px; margin-left: 3px; margin-right: 3px; margin-top: 10px; perspective-origin: 404px 51.0833px; transform-origin: 404px 51.0833px; margin-left: 3px; margin-top: 10px; margin-bottom: 10px; margin-right: 3px; "><div style="background-color: rgba(0, 0, 0, 0); block-size: 20.4333px; border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-end-end-radius: 0px; border-end-start-radius: 0px; border-inline-end-color: rgb(233, 233, 233); border-inline-end-style: solid; border-inline-end-width: 1px; border-inline-start-color: rgb(233, 233, 233); border-inline-start-style: solid; border-inline-start-width: 1px; border-left-color: rgb(233, 233, 233); border-left-style: solid; border-left-width: 1px; border-right-color: rgb(233, 233, 233); border-right-style: solid; border-right-width: 1px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-left-radius: 0px; border-top-right-radius: 0px; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; min-block-size: 18px; min-height: 18px; padding-inline-start: 4px; padding-left: 4px; perspective-origin: 404px 10.2167px; transform-origin: 404px 10.2167px; white-space: nowrap; "><span style="block-size: auto; border-inline-end-color: rgb(0, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(0, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(0, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(0, 0, 0); border-right-style: none; border-right-width: 0px; display: inline; margin-inline-end: 45px; margin-right: 45px; min-block-size: 0px; min-height: 0px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 100px 8.5px; transform-origin: 100px 8.5px; unicode-bidi: normal; white-space: pre; margin-right: 45px; "><span style="margin-inline-end: 0px; margin-right: 0px; perspective-origin: 32px 8.5px; transform-origin: 32px 8.5px; "> Input  </span><span style="border-block-end-color: rgb(170, 4, 249); border-block-start-color: rgb(170, 4, 249); border-bottom-color: rgb(170, 4, 249); border-inline-end-color: rgb(170, 4, 249); border-inline-start-color: rgb(170, 4, 249); border-left-color: rgb(170, 4, 249); border-right-color: rgb(170, 4, 249); border-top-color: rgb(170, 4, 249); caret-color: rgb(170, 4, 249); color: rgb(170, 4, 249); column-rule-color: rgb(170, 4, 249); margin-inline-end: 0px; margin-right: 0px; outline-color: rgb(170, 4, 249); perspective-origin: 68px 8.5px; text-decoration: none; text-decoration-color: rgb(170, 4, 249); text-emphasis-color: rgb(170, 4, 249); transform-origin: 68px 8.5px; ">x = [1 3 2 4 3 5]</span></span></div><div style="background-color: rgba(0, 0, 0, 0); block-size: 20.4333px; border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-end-end-radius: 0px; border-end-start-radius: 0px; border-inline-end-color: rgb(233, 233, 233); border-inline-end-style: solid; border-inline-end-width: 1px; border-inline-start-color: rgb(233, 233, 233); border-inline-start-style: solid; border-inline-start-width: 1px; border-left-color: rgb(233, 233, 233); border-left-style: solid; border-left-width: 1px; border-right-color: rgb(233, 233, 233); border-right-style: solid; border-right-width: 1px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-left-radius: 0px; border-top-right-radius: 0px; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; min-block-size: 18px; min-height: 18px; padding-inline-start: 4px; padding-left: 4px; perspective-origin: 404px 10.2167px; transform-origin: 404px 10.2167px; white-space: nowrap; "><span style="block-size: auto; border-inline-end-color: rgb(0, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(0, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(0, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(0, 0, 0); border-right-style: none; border-right-width: 0px; display: inline; margin-inline-end: 45px; margin-right: 45px; min-block-size: 0px; min-height: 0px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 80px 8.5px; transform-origin: 80px 8.5px; unicode-bidi: normal; white-space: pre; margin-right: 45px; "><span style="margin-inline-end: 0px; margin-right: 0px; perspective-origin: 32px 8.5px; transform-origin: 32px 8.5px; "> Output </span><span style="border-block-end-color: rgb(170, 4, 249); border-block-start-color: rgb(170, 4, 249); border-bottom-color: rgb(170, 4, 249); border-inline-end-color: rgb(170, 4, 249); border-inline-start-color: rgb(170, 4, 249); border-left-color: rgb(170, 4, 249); border-right-color: rgb(170, 4, 249); border-top-color: rgb(170, 4, 249); caret-color: rgb(170, 4, 249); color: rgb(170, 4, 249); column-rule-color: rgb(170, 4, 249); margin-inline-end: 0px; margin-right: 0px; outline-color: rgb(170, 4, 249); perspective-origin: 48px 8.5px; text-decoration: none; text-decoration-color: rgb(170, 4, 249); text-emphasis-color: rgb(170, 4, 249); transform-origin: 48px 8.5px; ">y is [1 2 3]</span></span></div><div style="background-color: rgba(0, 0, 0, 0); block-size: 20.4333px; border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-end-end-radius: 0px; border-end-start-radius: 0px; border-inline-end-color: rgb(233, 233, 233); border-inline-end-style: solid; border-inline-end-width: 1px; border-inline-start-color: rgb(233, 233, 233); border-inline-start-style: solid; border-inline-start-width: 1px; border-left-color: rgb(233, 233, 233); border-left-style: solid; border-left-width: 1px; border-right-color: rgb(233, 233, 233); border-right-style: solid; border-right-width: 1px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-left-radius: 0px; border-top-right-radius: 0px; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; min-block-size: 18px; min-height: 18px; padding-inline-start: 4px; padding-left: 4px; perspective-origin: 404px 10.2167px; transform-origin: 404px 10.2167px; white-space: nowrap; "><span style="block-size: auto; border-inline-end-color: rgb(0, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(0, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(0, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(0, 0, 0); border-right-style: none; border-right-width: 0px; display: inline; margin-inline-end: 45px; margin-right: 45px; min-block-size: 0px; min-height: 0px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 0px 8.5px; transform-origin: 0px 8.5px; unicode-bidi: normal; white-space: pre; margin-right: 45px; "><span style="margin-inline-end: 0px; margin-right: 0px; "></span></span></div><div style="background-color: rgba(0, 0, 0, 0); block-size: 20.4333px; border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-end-end-radius: 0px; border-end-start-radius: 0px; border-inline-end-color: rgb(233, 233, 233); border-inline-end-style: solid; border-inline-end-width: 1px; border-inline-start-color: rgb(233, 233, 233); border-inline-start-style: solid; border-inline-start-width: 1px; border-left-color: rgb(233, 233, 233); border-left-style: solid; border-left-width: 1px; border-right-color: rgb(233, 233, 233); border-right-style: solid; border-right-width: 1px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-left-radius: 0px; border-top-right-radius: 0px; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; min-block-size: 18px; min-height: 18px; padding-inline-start: 4px; padding-left: 4px; perspective-origin: 404px 10.2167px; transform-origin: 404px 10.2167px; white-space: nowrap; "><span style="block-size: auto; border-inline-end-color: rgb(0, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(0, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(0, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(0, 0, 0); border-right-style: none; border-right-width: 0px; display: inline; margin-inline-end: 45px; margin-right: 45px; min-block-size: 0px; min-height: 0px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 112px 8.5px; transform-origin: 112px 8.5px; unicode-bidi: normal; white-space: pre; margin-right: 45px; "><span style="margin-inline-end: 0px; margin-right: 0px; perspective-origin: 32px 8.5px; transform-origin: 32px 8.5px; "> Input  </span><span style="border-block-end-color: rgb(170, 4, 249); border-block-start-color: rgb(170, 4, 249); border-bottom-color: rgb(170, 4, 249); border-inline-end-color: rgb(170, 4, 249); border-inline-start-color: rgb(170, 4, 249); border-left-color: rgb(170, 4, 249); border-right-color: rgb(170, 4, 249); border-top-color: rgb(170, 4, 249); caret-color: rgb(170, 4, 249); color: rgb(170, 4, 249); column-rule-color: rgb(170, 4, 249); margin-inline-end: 0px; margin-right: 0px; outline-color: rgb(170, 4, 249); perspective-origin: 80px 8.5px; text-decoration: none; text-decoration-color: rgb(170, 4, 249); text-emphasis-color: rgb(170, 4, 249); transform-origin: 80px 8.5px; ">x = [5 9 3 2 2 0 -1]</span></span></div><div style="background-color: rgba(0, 0, 0, 0); block-size: 20.4333px; border-bottom-left-radius: 0px; border-bottom-right-radius: 0px; border-end-end-radius: 0px; border-end-start-radius: 0px; border-inline-end-color: rgb(233, 233, 233); border-inline-end-style: solid; border-inline-end-width: 1px; border-inline-start-color: rgb(233, 233, 233); border-inline-start-style: solid; border-inline-start-width: 1px; border-left-color: rgb(233, 233, 233); border-left-style: solid; border-left-width: 1px; border-right-color: rgb(233, 233, 233); border-right-style: solid; border-right-width: 1px; border-start-end-radius: 0px; border-start-start-radius: 0px; border-top-left-radius: 0px; border-top-right-radius: 0px; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; min-block-size: 18px; min-height: 18px; padding-inline-start: 4px; padding-left: 4px; perspective-origin: 404px 10.2167px; transform-origin: 404px 10.2167px; white-space: nowrap; "><span style="block-size: auto; border-inline-end-color: rgb(0, 0, 0); border-inline-end-style: none; border-inline-end-width: 0px; border-inline-start-color: rgb(0, 0, 0); border-inline-start-style: none; border-inline-start-width: 0px; border-left-color: rgb(0, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb(0, 0, 0); border-right-style: none; border-right-width: 0px; display: inline; margin-inline-end: 45px; margin-right: 45px; min-block-size: 0px; min-height: 0px; padding-inline-start: 0px; padding-left: 0px; perspective-origin: 92px 8.5px; transform-origin: 92px 8.5px; unicode-bidi: normal; white-space: pre; margin-right: 45px; "><span style="margin-inline-end: 0px; margin-right: 0px; perspective-origin: 32px 8.5px; transform-origin: 32px 8.5px; "> Output </span><span style="border-block-end-color: rgb(170, 4, 249); border-block-start-color: rgb(170, 4, 249); border-bottom-color: rgb(170, 4, 249); border-inline-end-color: rgb(170, 4, 249); border-inline-start-color: rgb(170, 4, 249); border-left-color: rgb(170, 4, 249); border-right-color: rgb(170, 4, 249); border-top-color: rgb(170, 4, 249); caret-color: rgb(170, 4, 249); color: rgb(170, 4, 249); column-rule-color: rgb(170, 4, 249); margin-inline-end: 0px; margin-right: 0px; outline-color: rgb(170, 4, 249); perspective-origin: 60px 8.5px; text-decoration: none; text-decoration-color: rgb(170, 4, 249); text-emphasis-color: rgb(170, 4, 249); transform-origin: 60px 8.5px; ">y is [5 3 2 -1]</span></span></div></div></div></div>

Solve

Solution Stats

63750 Solutions
28082 Solvers

Last Solution submitted on Mar 21, 2023

Last 200 Solutions

Problem Comments

33 Comments

33 Comments

Show 30 older comments

Oleg Komarov on 26 Jan 2012

Not clear.

Giuseppe Cardillo on 1 Feb 2012

What does it mean? It is not clear

Hristo Alexiev on 1 Feb 2012

It's not understandable.

Aurelien Queffurust on 3 Feb 2012

This problem is definitely not clear.

Martin on 7 Feb 2012

Select the first, the third, the fifth, the seventh, ... element.

Sumit Agrawal on 30 Mar 2013

nice problem

kurguz on 6 Apr 2013

I cant understand this problem.

Maciej Kusper on 4 Jun 2013

nice

Jon on 13 Nov 2013

All solutions with score 10 or 11 use the regexp cheat.

L.K.R.Chaithanya kumar on 15 Jul 2014

very good one

Armando Femat on 3 Dec 2015

Yes, you should change the redaction of the problem,maybe

Mir Rejaul Karim on 16 Jul 2016

function y = everyOther(x)
for i=1:length(x)
if mod(x(i),2)~=0
y(i)=x(i)
end
end
y=y(y>0)

end

What's wrong with this solution?

Rong Zeng on 21 Aug 2016

y = x(mod(x,2)==1);
it's not working, and i cant see why

Vineet Kumar on 25 Aug 2016

nice problem

SIVAPRAKASH DANABALASINGAM on 10 Jan 2017

nice

Taha MRIHEEL on 3 Apr 2017

good

Nikoo Azarm on 6 Apr 2017

I can't understand, why is this wrong?
j=1;
for i=1:length(x)
if rem(x(i),2)~=0
y(j)=x(i);
j=j+1;
end
end

Barrie Cooper on 25 Apr 2017

Nice problem, but I have been doing this with my son and it would be good if the exercises were more gently graduated with relevant syntax so he can learn without relying on his dad knowing Matlab!

James Tanner on 26 Jun 2017

I can't believe someone solved this with size 9.

Gulen Insay on 2 Sep 2017

The leading solution is not a solution. It just makes all the test assertions true.

Ghetto blaster on 22 Oct 2018

Indexing is one of more important things in matlab and matrices. Gotta learn them good before heading on.

Banana on 25 Sep 2019

Helo, hey hey ey

Matlab Expert on 7 Mar 2020

Indexing is one of more important things in matlab and matrices. Gotta learn them good before heading on.

Simone Tiero on 1 Nov 2020

Test suite suggests solution !

Teo Lungoci on 7 Feb 2021

nice

Muhtasim Haque Nahian on 21 Apr 2021

the example made confusion

chan chan on 3 May 2021

cool!

Nathan Hon on 14 Oct 2021

nice!

建国田 on 26 Oct 2021

cool!

Zachary Hill on 13 Dec 2021

hard

Erin Paisner on 18 Dec 2021

I overcomplicated this one at first, but once you figure it out, it's not too bad

Christian on 20 Nov 2022

Absolutely mind boggling

Robert on 11 Dec 2022

this one's pretty good

Solution Comments

Solution 10445465

1 Comment

1 Comment

Shadi on 16 Feb 2023

how easy amk

Solution 10445420

1 Comment

1 Comment

Arjun on 16 Feb 2023

Eazy Peazy
what is the value of life?

Solution 9019340

1 Comment

1 Comment

Chen Yuanyue on 9 Sep 2022

yes

Solution 7266310

2 Comments

2 Comments

David Bichara on 16 Dec 2021

Not too bad, tests vector manipulation

Dianne Valera on 26 Apr 2022

good job

Solution 7265900

1 Comment

1 Comment

Nicholas Wickersham on 16 Dec 2021

not bad

Solution 7265770

1 Comment

1 Comment

Robert Petrow on 16 Dec 2021

Not too complicated

Solution 7260625

1 Comment

1 Comment

Hayley Sussman on 15 Dec 2021

This problem helped me recall how to code with matrices and manipulate elements of a matrix.

Solution 6877199

1 Comment

1 Comment

Josh Klueber on 11 Nov 2021

nice

Solution 6499944

3 Comments

3 Comments

Lorenzo Astolfi on 9 Sep 2021

Very simple but really nice! It shows in an elementary way the very core of MATLAB language philosophy.

Nathan Hon on 14 Oct 2021

nice!

Isabella Stellitano on 26 Oct 2021

GOOD

Solution 5742770

1 Comment

1 Comment

Ricardo172 on 11 May 2021

It 'd be better to distinguish the index ot vector and the value of vector.

Solution 5666770

2 Comments

2 Comments

john perkins on 4 May 2021

challenging!

Parvinderkaur Sodhi on 23 Jun 2021

Yup !! Good one !

Solution 5267592

1 Comment

1 Comment

昌龍楊 on 5 Apr 2021

Answer in Test Suite. Lol.

Solution 5048693

1 Comment

1 Comment

李君 on 12 Mar 2021

hah, correct answer in the tests.

Solution 4142445

2 Comments

2 Comments

Cory Cunningham on 11 Dec 2020

cool!

chan chan on 3 May 2021

nice!

Solution 3324088

1 Comment

1 Comment

XC_Wang on 22 Oct 2020

this question is ambiguity...

Solution 3107341

1 Comment

1 Comment

Marco Torres on 7 Oct 2020

LOL, the solution is in the Test Suite :)

Solution 3094316

1 Comment

1 Comment

天夏 on 7 Oct 2020

why wrong?
My program woks!

Solution 3069898

1 Comment

1 Comment

akarsh saxena on 5 Oct 2020

error in template

Solution 3034759

1 Comment

1 Comment

Tatjana Dulinskiene on 2 Oct 2020

easy

Solution 2586085

Solution 2289691

1 Comment

1 Comment

swagata laxmi sengupta on 17 May 2020

this was so easy

Solution 2175863

1 Comment

1 Comment

Lewis Wootton on 26 Mar 2020

why is it we cant just see a correct answer once we've submitted enough wrong answers? That would actually improve learning time as opposed to going round in circles not knowing what to do.

Solution 2126234

1 Comment

1 Comment

Alessandro A on 12 Feb 2020

Nice one!

Solution 1986987

1 Comment

1 Comment

Sinh Luong on 23 Oct 2019

Nice XU

Solution 1963028

1 Comment

1 Comment

Sherlock Bugcrowd on 7 Oct 2019

Great to solve

Solution 1962948

1 Comment

1 Comment

Sherlock Bugcrowd on 7 Oct 2019

Great to solve

Solution 1958692

1 Comment

1 Comment

JIAN TANG on 4 Oct 2019

How to view the leasing solution?

Solution 1931727

2 Comments

2 Comments

Abuzar Qureshi on 12 Sep 2019

Nice and Easy

Hoang Vu on 22 Sep 2019

de dang va hay

Solution 1861840

1 Comment

1 Comment

SJ Won on 30 Jun 2019

Why doesn't this work??

Solution 1740066

1 Comment

1 Comment

Bella A. on 1 Mar 2019

nice!

Solution 1683513

2 Comments

2 Comments

jljl jacky on 4 Dec 2020

what is this code means?

Ralph Giffone on 23 Dec 2020

This same exact code has been posted for numerous problems and is not a true solution. It appears to be a way of hacking the Test Suite into accepting the code as a correct solution. It is also concise, so it always appears to be the "leading" solution. (I have only checked a handful of "leading solutions", so this is a conjecture on my part.)

Solution 1430214