Problem 43671. Words Count: A Cell Array Approach

Created by Peng Liu

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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>Given an input character vector consisting of words, punctuation marks, white spaces, and possibly newline characters (\\n), arrange the unique words alphabetically in a cell array of character vectors (formerly called</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"https://www.mathworks.com/help/matlab/matlab_prog/cell-arrays-of-strings.html\"><w:r><w:t>cell array of strings</w:t></w:r></w:hyperlink><w:r><w:t>) and calculate the histogram count of every unique word.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Assumptions:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"2\"/></w:numPr></w:pPr><w:r><w:t>Case is insensitive, e.g., WORDS and words are treated as the same word, and you may return in the output cell array either the uppercase or lowercase.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"2\"/></w:numPr></w:pPr><w:r><w:t>Punctuation marks are limited only to comma (,), period (.), colon (:), semi-colon (;), question mark (?), and exclamation mark (!).</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>For example, given the input txt as a character vector,</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[txt = 'I love MATLAB and Cody, but I don''t like trivial matlab problems on cody.';]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>the outputs should be</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[words = {'and';'but';'Cody';'don''t';'I';'like';'love';'MATLAB';...\n 'on';'problems';'trivial'};\ncount = [1; 1; 2; 1; 2; 1; 1; 2; 1; 1; 1];]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Hint: The cell array of strings approach is the dual of the string array approach, i.e., things that can be done via the</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://www.mathworks.com/matlabcentral/cody/problems/43670-words-count-a-string-array-approach\"><w:r><w:t>string arrays approach</w:t></w:r></w:hyperlink><w:r><w:t> can also be done using the cell array approach.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Related problems in this series:</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:hyperlink w:docLocation=\"http://www.mathworks.com/matlabcentral/cody/problems/43670-words-count-a-string-array-approach\"><w:r><w:t>Words Count: A String Array Approach</w:t></w:r></w:hyperlink></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>Words Count: A Cell Array Approach</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>"}]}

Given an input character vector consisting of words, punctuation marks, white spaces, and possibly newline characters (\n), arrange the unique words alphabetically in a cell array of character vectors (formerly called <a href = "https://www.mathworks.com/help/matlab/matlab_prog/cell-arrays-of-strings.html">cell array of strings</a>) and calculate the histogram count of every unique word.Assumptions:<ol><li>Case is insensitive, e.g., WORDS and words are treated as the same word, and you may return in the output cell array either the uppercase or lowercase.</li><li>Punctuation marks are limited only to comma (,), period (.), colon (:), semi-colon (;), question mark (?), and exclamation mark (!).</li></ol>For example, given the input txt as a character vector,<pre class="language-matlab">txt = 'I love MATLAB and Cody, but I don''t like trivial matlab problems on cody.';
</pre>the outputs should be<pre class="language-matlab">words = {'and';'but';'Cody';'don''t';'I';'like';'love';'MATLAB';...
 'on';'problems';'trivial'};
count = [1; 1; 2; 1; 2; 1; 1; 2; 1; 1; 1];
</pre>Hint: The cell array of strings approach is the dual of the string array approach, i.e., things that can be done via the <a href = "http://www.mathworks.com/matlabcentral/cody/problems/43670-words-count-a-string-array-approach">string arrays approach</a> can also be done using the cell array approach.Related problems in this series:<ul><li><a href = "http://www.mathworks.com/matlabcentral/cody/problems/43670-words-count-a-string-array-approach">Words Count: A String Array Approach</a></li><li>Words Count: A Cell Array Approach</li></ul>

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