Problem 1961. Finding neighbors of [-1:1] in a matrix....

Created by Chris E.

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>Hello All!</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Well I found this one fun to figure out, all you have to do is make a matrix of 1's or 0's (true or false) that show whether or not a number in a matrix is sitting directly next to (a neighbor) that is number that is +1 or -1 or == to that of the original number. Here are some examples:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[M1 = [1 2 1;\n 5 6 7;\n 2 3 6]]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>SO now find numbers next to one another that are +1 of each-other.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[output = [1 1 1;\n 1 1 1;\n 1 1 1]\nOne more:\n\nM2 = [8 8 8;\n 4 4 4;\n 1 9 7]]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>SO now find numbers next to one another that are +1 of each-other.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[output = [1 1 1;\n 1 1 1;\n 0 0 0]]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>One more:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[M3 = [1 8 5;\n 4 10 22;\n 1 66 7]]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>SO now find numbers next to one another that are +1 of each-other.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[output = [0 0 0;\n 0 0 0;\n 0 0 0]]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Well good luck!</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>"}]}

Hello All!Well I found this one fun to figure out, all you have to do is make a matrix of 1's or 0's (true or false) that show whether or not a number in a matrix is sitting directly next to (a neighbor) that is number that is +1 or -1 or == to that of the original number. Here are some examples:<pre class="language-matlab">M1 = [1 2 1;
 5 6 7;
 2 3 6]
</pre>SO now find numbers next to one another that are +1 of each-other.<pre class="language-matlab">output = [1 1 1;
 1 1 1;
 1 1 1]
One more:
</pre><pre class="language-matlab">M2 = [8 8 8;
 4 4 4;
 1 9 7]
</pre>SO now find numbers next to one another that are +1 of each-other.<pre class="language-matlab">output = [1 1 1;
 1 1 1;
 0 0 0]
</pre>One more:<pre class="language-matlab">M3 = [1 8 5;
 4 10 22;
 1 66 7]
</pre>SO now find numbers next to one another that are +1 of each-other.<pre class="language-matlab">output = [0 0 0;
 0 0 0;
 0 0 0]
</pre>Well good luck!

Solve

Solution Stats

120 Solutions
70 Solvers

Last Solution submitted on Jul 04, 2023

Last 200 Solutions

Problem Comments

1 Comment

1 Comment

Jean-Marie Sainthillier on 7 Mar 2014

Good problem. You should generalise it with more tests (size of the matrix, different gap...).
I suspect that my solution isn't correct.

Solution Comments

Show comments

Problem Recent Solvers70

Problem Tags

Community Treasure Hunt

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

Start Hunting!

Problem 1961. Finding neighbors of [-1:1] in a matrix....

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers70

Suggested Problems

More from this Author17

Problem Tags

Community Treasure Hunt

Problem 1961. Finding neighbors of [-1:1] in a matrix....

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers70

Suggested Problems

More from this Author17

Problem Tags

Community Treasure Hunt

Players