Problem 2456. remove single elements

Created by rifat

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>Given a vector of integers, remove the elements that have appeared only once. The output elements should be in exact order as the input except the single elements being removed.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Example:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[Input: vec = [2 2 1 2 3 4 1 2];\nOutput: [2 2 1 2 1 2];]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Loops are not allowed.</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

238 Solutions
69 Solvers

Last Solution submitted on May 12, 2022

Last 200 Solutions

Problem Comments

2 Comments

2 Comments

Guillaume on 21 Jul 2014

Since matlab has so many different ways of representing the empty set, could you test for emptiness using isempty(...) rather than isequal([], ...) ?

shahriar memaran on 25 Mar 2017

Test suit # 4 should not compare out = [] with output of the function but rather isempty(out) !!!

Solution Comments

Solution 2675138

1 Comment

1 Comment

Masato Kanematsu on 10 Jul 2020

This cody problem is really nice. At first, I felt difficult to solve it without for or while. After that, I reached to a solution.

Solution 490227

2 Comments

2 Comments

Harish Maradana on 25 Aug 2014

function A=removeSingle(A)
[n, bin] = histc(A, unique(A));
multiple = find(n ==1);
index = find(ismember(bin, multiple));
A(index)=[];
end
failed for 4 test suit help me

Binbin Qi on 27 Oct 2014

>> A = 1;A(1)=[];size(A)
ans =
1 0
>> size([])
ans =
0 0

Problem Recent Solvers69

Problem Tags

matrix manipulation unique

Community Treasure Hunt

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

Start Hunting!

Problem 2456. remove single elements

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers69

Suggested Problems

More from this Author44

Problem Tags

Community Treasure Hunt

Problem 2456. remove single elements

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers69

Suggested Problems

More from this Author44

Problem Tags

Community Treasure Hunt

Players