Problem 43674. String Array Basics, Part 3: Convert Cell Array with Missing Values to String Array

Created by Peng Liu

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<a href = "http://www.mathworks.com/help/matlab/characters-and-strings.html">String array</a> and cell array are two types of containers for storing pieces of data. In this problem, you will be given a cell array of character vectors. Your job is to convert the cell array to a string array, which stores the same pieces of text data.The <a href = "http://www.mathworks.com/matlabcentral/cody/problems/43677-string-array-basics-part-1-convert-cell-array-to-string-array-no-missing-values">Part 1</a> assuming no missing values in the input cell array is a good starting point. In this problem, the missing values for cell array of character vectors, denoted {''} (i.e., cell of empty character), need to be converted to the missing values for string arrays, denoted &lt; missing &gt;.Refer to the R2016b documentation for more information on the <a href = "http://www.mathworks.com/help/matlab/ref/ismissing.html?=ismissing">missing values for different data types</a>.Example:<pre class="language-matlab">Input:
&gt;&gt; x = {'I', '', '', 'MATLAB'}
x =
 1×4 cell array
 'I' '' '' 'MATLAB'
</pre><pre class="language-matlab">Output:
&gt;&gt; y = string('I'); y(4) = 'MATLAB'
y = 
 1×4 string array
 "I" &lt;missing&gt; &lt;missing&gt; "MATLAB"
</pre>Related Problems in this series:<ul><li><a href = "http://www.mathworks.com/matlabcentral/cody/problems/43677-string-array-basics-part-1-convert-cell-array-to-string-array-no-missing-values">String Array Basics, Part 1: Convert Cell Array to String Array; No Missing Values</a></li><li><a href = "http://www.mathworks.com/matlabcentral/cody/problems/43672-string-array-basics-part-2-convert-string-array-to-cell-array-no-missing-values">String Array Basics, Part 2: Convert String Array to Cell Array; No Missing Values</a></li><li>String Array Basics, Part 3: Convert Cell Array with Missing Values to String Array</li><li><a href = "http://www.mathworks.com/matlabcentral/cody/problems/43673-string-array-basics-part-4-convert-string-array-to-cell-array-with-missing-values">String Array Basics, Part 4: Convert String Array with Missing Values to Cell Array</a></li></ul>

<http://www.mathworks.com/help/matlab/characters-and-strings.html String array> and cell array are two types of containers for storing pieces of data. In this problem, you will be given a cell array of character vectors. Your job is to convert the cell array to a string array, which stores the same pieces of text data.

The <http://www.mathworks.com/matlabcentral/cody/problems/43677-string-array-basics-part-1-convert-cell-array-to-string-array-no-missing-values Part 1> assuming no missing values in the input cell array is a good starting point. In this problem, the missing values for cell array of character vectors, denoted *{''}* (i.e., cell of empty character), need to be converted to the missing values for string arrays, denoted *< missing >*.

Refer to the R2016b documentation for more information on the <http://www.mathworks.com/help/matlab/ref/ismissing.html?=ismissing missing values for different data types>.

Example:

Input:
  >> x = {'I', '', '', 'MATLAB'}
  x =
    1×4 cell array
      'I'    ''    ''    'MATLAB'

Output:
 >> y = string('I'); y(4) = 'MATLAB'
 y = 
 1×4 string array
 "I" <missing> <missing> "MATLAB"

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Last Solution submitted on Oct 20, 2022

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2 Comments

bainhome on 1 Apr 2018

very cool question: learn some new tricks, and get 10 points, why not?!

Nikolaos Nikolaou on 26 Oct 2019

Hint to spare the pain : string(NaN)==[]

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Problem 43674. String Array Basics, Part 3: Convert Cell Array with Missing Values to String Array

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