Problem 44480. The average of the second largest values

Created by Noriko HOUNOKI

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","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\"?><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 matrix, find the average of the second largest values in each row. The same value does not exist on a row.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/><w:jc w:val=\"left\"/></w:pPr><w:r><w:t>Example: input x = [1 2 3 4;8 7 6 5;9 0 1 4] &gt;&gt;&gt; output y = (3+7+4) / 3</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

58 Solutions
38 Solvers

Last Solution submitted on Aug 12, 2020

Last 200 Solutions

Solution Comments

Solution 1448126

1 Comment

1 Comment

John BG on 23 Feb 2018

this

x2=x
[max1,ind1]=max(x2,[],2)
x2(sub2ind(size(x),[1:3],ind1'))=NaN
[max2,ind2]=max(x2,[],2)
y=mean(x2(sub2ind(size(x),[1:size(x,1)],ind2')))

solves the question yet the checker returns not a valid answer.

Solution 1448117

1 Comment

1 Comment

John BG on 23 Feb 2018

the following 4 lines solve this question

[max1,ind1]=max(x,[],2)
x(sub2ind(size(x),[1:3],ind1'))=NaN
[max2,ind2]=max(x,[],2)
y=mean(x(sub2ind(size(x),[1:3],ind2')))

yet the online checker returns not a valid answer

Problem Recent Solvers38

Problem Tags

basic matlab basics

Problem 44480. The average of the second largest values

Solution Stats

Last 200 Solutions

Solution Comments

Problem Recent Solvers38

Suggested Problems

More from this Author9

Problem Tags

Problem 44480. The average of the second largest values

Solution Stats

Last 200 Solutions

Solution Comments

Problem Recent Solvers38

Suggested Problems

More from this Author9

Problem Tags

Players