Problem 1035. Generate a vector like 1,2,2,3,3,3,4,4,4,4

Created by Binbin Qi

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Generate a vector like 1,2,2,3,3,3,4,4,4,4</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>So if n = 3, then return</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ [1 2 2 3 3 3]]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>And if n = 5, then return</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ [1 2 2 3 3 3 4 4 4 4 5 5 5 5 5]]]></w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Solve

Solution Stats

13694 Solutions
3923 Solvers

Last Solution submitted on Mar 06, 2021

Last 200 Solutions

Problem Comments

13 Comments

13 Comments

Show 10 older comments

Dariusz on 23 Dec 2012

function ans = GenerateVector(n)
ans = 1;
for n = 2:n
ans = [ans n*ones(1, n)];
end

could sb explain me why this code is flagged a as a bad one ?? it works !! and another thign in problem definition it is not clearly stated that the solutions must be straight code without writing a function. I wrote a function and it works well to the definition of the problem. then I am getting incorrect information after submission. dear cody team: please write more specific requirements of the problem. you will miss many misunderstandings then.

Ned Gulley on 24 Dec 2012

Your function has to use exactly the same name that is provided in the function template. In this case, the function must be called "you_fcn_name". You wrote a function called "GenerateVector". Change the name of your function and it should pass.

goc3 on 18 Nov 2016

The test suite has been expanded.

Thibault Vlieghe on 23 Jun 2019

Good problem.

Is there any way to avoid the for loop? I really want to but I don't see how right now.

Ashish Kaushik on 25 Jun 2019

Good one! took some time but finally did it.

Simon on 1 Nov 2019

Can it be done without a for loop?

Andrea Gasparri on 19 Dec 2019

Good problem.

HINT:

use command "repelem"

Solution:

A=1:n
B=repelem(A,1:n)

Stefanos Charkoutsis on 8 Feb 2020

great problem. Interesting for beginners like me.

Gurrala V Krishna Reddy on 17 Apr 2020

can we do it without loops?

Jyothsna Chintala on 21 Apr 2020

good

Sanchit Singla on 19 Jun 2020

good problem

源樹上林 on 13 Aug 2020

good
one liner

Jose Dominguez Alfonseca on 12 Feb 2021 at 5:20

Incredibly fun problem!

Solution Comments

Solution 3033235

1 Comment

1 Comment

Tatjana Dulinskiene on 2 Oct 2020

repelem(1:n,1:n)

Solution 2585890

2 Comments

2 Comments

Piero Cimule on 19 Jun 2020

ans=0
for i=1:n
for j=1:i
ans(end+1)=i;
end

end

ans(:,1)=[] %delete first column

rohith Ashok kumar on 26 Dec 2020

function a=your_function_name(n)
a(1)=1;
a(2)=2;
for i=2:n
for j=1:i
a(i+j)=I;
end
end
end

Solution 2406839

1 Comment

1 Comment

Victor Quezada on 28 May 2020

The suggestion leads to wrong answers because of "ans".

Solution 2112738

1 Comment

1 Comment

Neil Sommerville on 31 Jan 2020

It would be nice to know how the leading solution was do to be so small.

Solution 1885341

1 Comment

1 Comment

Ashish Khulbey on 27 Jul 2019

My solution size is at least 6 times than the leading solution. I would like to be enlightened...

Solution 1855317

1 Comment

1 Comment

Chris Breshike on 21 Jun 2019

what's wrong with my answer? it gives exactly the right answer just not in []
also the test suite says it gives you x but when you use x in the function it doesn't recognize x you have to use n

Solution 1744990

1 Comment

1 Comment

Jason Casey on 7 Mar 2019

Great problem

Solution 1718667

Solution 608040

1 Comment

1 Comment

Shuvo Kumar Paul on 30 Jul 2020

Brilliant solution without using loops.

Solution 358262

1 Comment

1 Comment

Jonathan on 22 Nov 2013

Funny, I just tested you SO post too, and it has 2 nodes lest without the assignment to ans. I don't get this yet...

Solution 286461

1 Comment

1 Comment

Stefano sala on 19 Apr 2020

neat and elegant.
didn't even known about Henkel's matrix

Solution 170884

3 Comments

3 Comments

Dariusz on 30 Nov 2012

could sb please explain me politely why this code has been rated as an incorrect one ? if you paste this in m-file it works !!!

Peng Liu on 26 Mar 2015

Function name should be your_fcn_name

Jyothsna Chintala on 21 Apr 2020

good

Problem Recent Solvers3923

Problem Tags

for ones zeros

Community Treasure Hunt

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

Start Hunting!

Problem 1035. Generate a vector like 1,2,2,3,3,3,4,4,4,4

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers3923

Suggested Problems

More from this Author17

Problem Tags

Community Treasure Hunt

Problem 1035. Generate a vector like 1,2,2,3,3,3,4,4,4,4

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers3923

Suggested Problems

More from this Author17

Problem Tags

Community Treasure Hunt

Players