Problem 722. Make a run-length companion vector

Created by Ned Gulley

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 x, return a vector r that indicates the run length of any value in x. Each element in r shows how many times the corresponding element in x has appeared consecutively.</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  x = [5 3 3 1 0 9 9 4 4 4 4 5 1 2 2]\n Output r = [1 1 2 1 1 1 2 1 2 3 4 1 1 1 2]]]></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

1018 Solutions
559 Solvers

Last Solution submitted on Aug 13, 2020

Last 200 Solutions

Problem Comments

5 Comments

5 Comments

Show 2 older comments

Wenwu on 4 Jan 2015

The first test case seems to be invalid answer. Please check it

Ned Gulley on 6 Jan 2015

Hi Wenwu: Could you be more specific about what you think the problem is?

Carl Witthoft on 9 Dec 2015

See FileExchange's seqle . (disclaimer: I'm the author)

hubert andre on 13 Apr 2016

False exemple description

GEORGIOS BEKAS on 14 Feb 2018

y=[];

for i = 1:length(delta)
test = max(delta(1:i));
maxsofar=max(delta(1:i-1));
test2=min(delta(1:i));
minsofar=min(delta(1:i-1));
if test == delta(i) && delta(i)~= maxsofar
y=[y,1];
elseif test2 == delta(i) && delta(i)~= minsofar
y=[y,-1];
else
y=[y,0];
end
end

this code despite its giving correct results it is rejected by the tests...

Solution Comments

Solution 1088822

1 Comment

1 Comment

cool on 24 Dec 2016

the 1st test suite seems not right.

Solution 815614

1 Comment

1 Comment

ABDELRAHMAN on 28 Jan 2016

the sol of first test isn't correct

Problem Recent Solvers559

Problem Tags

Problem 722. Make a run-length companion vector

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers559

Suggested Problems

More from this Author49

Problem Tags

Problem 722. Make a run-length companion vector

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers559

Suggested Problems

More from this Author49

Problem Tags

Players