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

Created by Peng Liu

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:hyperlink w:docLocation=\"http://www.mathworks.com/help/matlab/characters-and-strings.html\"><w:r><w:t>String array</w:t></w:r></w:hyperlink><w:r><w:t> 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.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>The</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://www.mathworks.com/matlabcentral/cody/problems/43677-string-array-basics-part-1-convert-cell-array-to-string-array-no-missing-values\"><w:r><w:t>Part 1</w:t></w:r></w:hyperlink><w:r><w:t> 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</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:b/></w:rPr><w:t>{''}</w:t></w:r><w:r><w:t> (i.e., cell of empty character), need to be converted to the missing values for string arrays, denoted</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:b/></w:rPr><w:t>&lt; missing &gt;</w:t></w:r><w:r><w:t>.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Refer to the R2016b documentation for more information on the</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://www.mathworks.com/help/matlab/ref/ismissing.html?=ismissing\"><w:r><w:t>missing values for different data types</w:t></w:r></w:hyperlink><w:r><w:t>.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Example:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[Input:\n>> x = {'I', '', '', 'MATLAB'}\nx =\n 1×4 cell array\n 'I' '' '' 'MATLAB'\n\nOutput:\n>> y = string('I'); y(4) = 'MATLAB'\ny = \n 1×4 string array\n \"I\" <missing> <missing> \"MATLAB\"]]></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/43677-string-array-basics-part-1-convert-cell-array-to-string-array-no-missing-values\"><w:r><w:t>String Array Basics, Part 1: Convert Cell Array to String Array; No Missing Values</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:hyperlink w:docLocation=\"http://www.mathworks.com/matlabcentral/cody/problems/43672-string-array-basics-part-2-convert-string-array-to-cell-array-no-missing-values\"><w:r><w:t>String Array Basics, Part 2: Convert String Array to Cell Array; No Missing Values</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>String Array Basics, Part 3: Convert Cell Array with Missing Values to String Array</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/43673-string-array-basics-part-4-convert-string-array-to-cell-array-with-missing-values\"><w:r><w:t>String Array Basics, Part 4: Convert String Array with Missing Values to Cell Array</w:t></w:r></w:hyperlink></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>"}]}

<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>

Solve

Solution Stats

250 Solutions
72 Solvers

Last Solution submitted on Dec 30, 2020

Last 200 Solutions

Problem Comments

2 Comments

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)==[]

Problem Recent Solvers72

Problem Tags

Community Treasure Hunt

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

Start Hunting!

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

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers72

Suggested Problems

More from this Author30

Problem Tags

Community Treasure Hunt

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

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers72

Suggested Problems

More from this Author30

Problem Tags

Community Treasure Hunt

Players