Problem 43670. Words Count: A String Array Approach

Created by Peng Liu

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Given an input character vector consisting of words, punctuation marks, white spaces, and possibly newline characters (\n), arrange the unique words alphabetically in a <a href = "https://www.mathworks.com/help/matlab/characters-and-strings.html">string array</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 string 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 = string({'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 R2016b documentation provides a good <a href = "http://www.mathworks.com/help/matlab/matlab_prog/analyze-text-data-with-string-arrays.html">example</a> of text data analysis via the string array approach. However, some steps illustrated in that example are unnecessary, and we can indeed accomplish the same task in a simpler way.Related problems in this series:<ul><li><a href = "http://www.mathworks.com/matlabcentral/cody/problems/43671-words-count-a-cell-array-approach">Words Count: A Cell Array Approach</a></li><li>Words Count: A String Array Approach</li></ul>

Given an input character vector consisting of words, punctuation marks, white spaces, and possibly newline characters (\n), arrange the unique words alphabetically in a <https://www.mathworks.com/help/matlab/characters-and-strings.html string array> and calculate the histogram count of every unique word.

Assumptions:

# Case is insensitive, e.g., WORDS and words are treated as the same word, and you may return in the output string array either the uppercase or lowercase.
# Punctuation marks are limited only to comma (,), period (.), colon (:), semi-colon (;), question mark (?), and exclamation mark (!).

For example, given the input txt as a character vector,

txt = 'I love MATLAB and Cody, but I don''t like trivial matlab problems on cody.';

the outputs should be

words = string({'and';'but';'Cody';'don''t';'I';'like';'love';'MATLAB';...
                  'on';'problems';'trivial'});
  count = [1; 1; 2; 1; 2; 1; 1; 2; 1; 1; 1];

Hint: The R2016b documentation provides a good <http://www.mathworks.com/help/matlab/matlab_prog/analyze-text-data-with-string-arrays.html example> of text data analysis via the string array approach. However, some steps illustrated in that example are unnecessary, and we can indeed accomplish the same task in a simpler way.

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371 Solutions
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Last Solution submitted on Mar 16, 2023

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bainhome on 1 Apr 2018

the whole set of 2016b string challenge is just wonderful ! even for today, it is still looks advancing. Thank you for the thoughts and the work.

Peng Liu on 1 Apr 2018

Thank you for your interest. Cody is already powered by the newest R2018a. It might be be a good time to start a R2018a challenge group :)

Solution Comments

Solution 7481415

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2 Comments

Armando Longobardi on 5 Feb 2022

Credits to:
Solution 1057680 of Problem 43671
Submitted on 21 Nov 2016 by Jan Orwat

I just wanted to check if the two problems were different

Dyuman Joshi on 7 Mar 2022

regexp is an OP tool if one knows how to wield it

Solution 1476264

1 Comment

1 Comment

bainhome on 23 Apr 2018

sharp 3rd output parameter idx!

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Problem 43670. Words Count: A String Array Approach

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