Problem 2045. Only once: cleaning up your columns

Created by J-G van der Toorn

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>We have a logical array (with ones and zeroes). It is simple: after processing every column may only contain a single true value, or none at all. Not on any row, but only the uppermost occurrence in the input array, if any.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>For example:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ [ 0 0 1 1\n\n   0 1 0 1\n\n   0 0 1 1 ] \nbecomes \n [ 0 0 1 1\n\n   0 1 0 0\n\n   0 0 0 0 ]]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>And of course, your solution should be the most innovative, shortest and most elegant one.</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

37 Solutions
19 Solvers

Last Solution submitted on Sep 06, 2020

Last 200 Solutions

Problem Comments

Problem Recent Solvers19

Problem Tags

logic array matrix manipulation

Community Treasure Hunt

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

Start Hunting!

Problem 2045. Only once: cleaning up your columns

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers19

Suggested Problems

More from this Author31

Problem Tags

Community Treasure Hunt

Problem 2045. Only once: cleaning up your columns

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers19

Suggested Problems

More from this Author31

Problem Tags

Community Treasure Hunt

Players