Problem 367. Specific Element Count

Created by @bmtran (Bryant Tran)

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</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:i/></w:rPr><w:t>v</w:t></w:r><w:r><w:t> and a element</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:i/></w:rPr><w:t>e</w:t></w:r><w:r><w:t>, return the number of occurrences of</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:i/></w:rPr><w:t>e</w:t></w:r><w:r><w:t> in</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:i/></w:rPr><w:t>v</w:t></w:r><w:r><w:t>.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Note: NaNs are equal and there may be no occurrences of</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:i/></w:rPr><w:t>e</w:t></w:r><w:r><w:t> in</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:i/></w:rPr><w:t>v</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[v = 1:10\ne = 2\noutput = 1]]></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

2634 Solutions
711 Solvers

Last Solution submitted on Jan 25, 2022

Last 200 Solutions

Problem Comments

Solution Comments

Solution 3553135

1 Comment

1 Comment

Swati Sarangi on 5 Nov 2020

The below code fails for the input:
assert(isequal(ecount([1 1 1 1 NaN NaN 1 1],NaN),2))

Can anyone show me the error?

function ct = ecount(v,e)
s=0;
for i=1:length(v)
if v(i)==e
s=s+1;
elseif v(i)=='NaN'
s=s+1;
i=i+1;
end
ct =s;

end

Solution 1552355

1 Comment

1 Comment

Peter Corke on 7 Jun 2018

The comment about NaNs being equal is rather vague, clarify or give a specific example

Solution 471034

2 Comments

2 Comments

Harish Maradana on 13 Jul 2014

NaN==NaN gives 0 help me

Xiangbing Jiao on 11 May 2019

Use isnan keyword. isnan(NaN) gives 1

Solution 397087

1 Comment

1 Comment

Andrew on 5 Feb 2014

There should be a test to stop this from passing

Solution 217331

1 Comment

1 Comment

Tim on 14 Mar 2013

This just got lucky on the test suite. It would fail on ecount(1:12,2), for example.

Problem Recent Solvers711

Problem Tags

Community Treasure Hunt

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

Start Hunting!

Problem 367. Specific Element Count

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers711

Suggested Problems

More from this Author56

Problem Tags

Community Treasure Hunt

Problem 367. Specific Element Count

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers711

Suggested Problems

More from this Author56

Problem Tags

Community Treasure Hunt

Players