Problem 2836. Modify subscripts - easier

Created by Jan Orwat

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{"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>MATLAB supports object-oriented programming. Let's take an advantage of it in cody.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>This problem focus on modifying subscripted references for class double.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>This example shows classical behavior:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[>> A = [1 4 7\n 2 5 8\n 3 6 9];\n>> A([1 3], [3 1])\n\nans =\n\n 7 1\n 9 3]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>While this is what I am looking for:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[>> modified_A = sub_double(A);\n>> modified_A([1 3], [3 1])\n\nans = \n\n 7 3\n\n>> modified_A([1 2 2], [3 1 2])\n\nans = \n\n 7 2 5]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>If there are given two subscripts vectors of the same lenght, return only those values which correspond to paired subscriptions.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Task</w:t></w:r><w:r><w:t>: You are given class template. Complete it to achieve desired behaviour.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Additional info:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>If you are not familiar with classes in MATLAB you can find more information</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://www.mathworks.com/help/matlab/matlab_oop/class-definition.html\"><w:r><w:t>here</w:t></w:r></w:hyperlink><w:r><w:t> and</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://www.mathworks.com/help/matlab/customize-matlab-behavior.html\"><w:r><w:t>here</w:t></w:r></w:hyperlink><w:r><w:t> or you can find it typing:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ >> doc 'Class Definition'\n >> doc 'Customize MATLAB Behavior']]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>Feel free to modify the template,</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>You can try your skills to write a function instead of a class. You can use anonymus functions, etc.,</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>Using classes open another doors to cheat (easily). This is not a hacking problem, so please respect it (you can create some new, interesting problems :-) ),</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>In this form it is solvable without using function \"builtin\" which is forbidden in cody. I can allow it in the testsuite if there will be need for it,</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>Look for more problems using tags below</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Enjoy!</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>"}]}

MATLAB supports object-oriented programming. Let's take an advantage of it in cody.This problem focus on modifying subscripted references for class double.This example shows classical behavior:<pre class="language-matlab">&gt;&gt; A = [1 4 7
 2 5 8
 3 6 9];
&gt;&gt; A([1 3], [3 1])
</pre><pre class="language-matlab">ans =
</pre><pre> 7 1
 9 3</pre>While this is what I am looking for:<pre class="language-matlab">&gt;&gt; modified_A = sub_double(A);
&gt;&gt; modified_A([1 3], [3 1])
</pre><pre class="language-matlab">ans = 
</pre><pre> 7 3</pre><pre class="language-matlab">&gt;&gt; modified_A([1 2 2], [3 1 2])
</pre><pre class="language-matlab">ans = 
</pre><pre> 7 2 5</pre>If there are given two subscripts vectors of the same lenght, return only those values which correspond to paired subscriptions.Task: You are given class template. Complete it to achieve desired behaviour.Additional info:<ul><li>If you are not familiar with classes in MATLAB you can find more information <a href = "http://www.mathworks.com/help/matlab/matlab_oop/class-definition.html">here</a> and <a href = "http://www.mathworks.com/help/matlab/customize-matlab-behavior.html">here</a> or you can find it typing:</li></ul><pre> &gt;&gt; doc 'Class Definition'
 &gt;&gt; doc 'Customize MATLAB Behavior'</pre><ul><li>Feel free to modify the template,</li><li>You can try your skills to write a function instead of a class. You can use anonymus functions, etc.,</li><li>Using classes open another doors to cheat (easily). This is not a hacking problem, so please respect it (you can create some new, interesting problems :-) ),</li><li>In this form it is solvable without using function "builtin" which is forbidden in cody. I can allow it in the testsuite if there will be need for it,</li><li>Look for more problems using tags below</li></ul>Enjoy!

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Last Solution submitted on Mar 23, 2021

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Andrew Newell on 9 May 2017

Are they still allowing classes? My solution passed all the tests on my computer.

Andrew Newell on 9 May 2017

However, when I ran it on Cody, I got "Something went wrong. Please check your code for errors and try again later."

Jan Orwat on 10 May 2017

Hi Andrew, I will check it out.

Andrew Newell on 17 May 2017

Whatever the problem is, it went away.

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Problem 2836. Modify subscripts - easier

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