Problem 774. Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4

Created by Julio

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>Example:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ in = magic(5)\n\n in =\n\n    17    24     1     8    15\n    23     5     7    14    16\n     4     6    13    20    22\n    10    12    19    21     3\n    11    18    25     2     9 \n\n out = \n    23     5     7    14    16]]></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

360 Solutions
143 Solvers

Last Solution submitted on Apr 27, 2021

Last 200 Solutions

Problem Comments

10 Comments

10 Comments

Show 7 older comments

Eszter Szucs on 19 Jun 2012

In the example the output is a vector, not a matrix as during the test run.

Richard Zapor on 20 Jun 2012

The example output is missing row 3.

Julio on 20 Jun 2012

In row 3, the element 4 is not less than 4 but less than or equal to 4 or greater than or equal to 4. This is the reason for removing this row.

Ned Gulley on 21 Jun 2012

I'm still puzzled by your example. Row 3 has no elements less than 4, therefore it should NOT be removed, right? But it was removed. That seems wrong. For this example to be correct, the problem should be called "Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4".

Ned Gulley on 22 Jun 2012

Thanks for making the change! It's a good problem.

Mark on 26 Jun 2012

The title and example are consistent. However the test case only removes rows with at least 1 element less than 4, which disagrees with title and example.

TAB on 26 Jun 2012

Need to modify the test case.

Matthew Eicholtz on 5 Jul 2013

Please modify either the test suite or the title to be consistent.

Chad Gilbert on 19 Jul 2013

I agree you should change the test to match the question. Also, perhaps add more than one test.

Andrew Dobrovolc on 13 Sep 2017

Your test suite is has an incorrect answer, the last row contains a 4.

Solution Comments

Solution 1096896

1 Comment

1 Comment

yurenchu on 3 Jan 2017

Your test suite contains an error. The desired output contains a 4 in the third row, even though the task is to remove every row with an element less than or EQUAL TO a 4.

Solution 840083

1 Comment

1 Comment

eggart on 29 Feb 2016

In Your solution the last row contains 4. So probably You'd like to delete rows with at least one element smaller than 4.

Problem Recent Solvers143

Problem Tags

matrix poor_test_suite

Community Treasure Hunt

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

Start Hunting!

Problem 774. Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers143

Suggested Problems

More from this Author10

Problem Tags

Community Treasure Hunt

Problem 774. Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers143

Suggested Problems

More from this Author10

Problem Tags

Community Treasure Hunt

Players