Problem 44634. Basic matrix operations using standard MATLAB commands

Created by Srishti Saha

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>Create the matrix:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ 1.0e+15 *\n\n    0.0000    0.0000    0.0000    0.0000    0.0000\n    0.0000    0.0000    0.0000    0.0000    0.0000\n    0.0001    0.0010    0.0100    0.1000    1.0000]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Find the row vector of all column means</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Hint: Use</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:i/></w:rPr><w:t>logspace</w:t></w:r><w:r><w:t> to create the matrix. Avoid looking at the test suite before writing a solution</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

62 Solutions
40 Solvers

Last Solution submitted on Dec 29, 2021

Last 200 Solutions

Problem Comments

1 Comment

1 Comment

David Verrelli on 11 May 2018

This problem needs improvement.
FIRST: the Problem Statement is badly flawed. The starting matrix which is presented appears to contain zero for all entries in the first two rows, although apparently this is not what was intended (according to the Test Suite). SECOND: the Test Suite explicitly contains the solution, and there is only one test case. Asking people not to look is futile. Test Suites should be constructed with multiple cases by generalising the Problem Statement (e.g. allowing different numbers of rows in the starting matrix). See Problem 44616 for further discussion. —DIV

Problem Recent Solvers40

Problem Tags

average basic matlab logspace matlab matlab 101 matrices matrix mean poor_problem_statement poor_test_suite

Community Treasure Hunt

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

Start Hunting!

Problem 44634. Basic matrix operations using standard MATLAB commands

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers40

Suggested Problems

More from this Author29

Problem Tags

Community Treasure Hunt

Problem 44634. Basic matrix operations using standard MATLAB commands

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers40

Suggested Problems

More from this Author29

Problem Tags

Community Treasure Hunt

Players