Problem 552. Cell Array Inception?

Created by Drew Weymouth

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:r><w:t>Jimmy is a beginning MATLAB student who is trying to read in a text file and build a cell array of strings, where A{k} is the kth line of the text file. He writes the following code, and is confused when it doesn't work:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[fid = fopen('myfile.txt','r');\nA = {};\nwhile ~feof(fid)\n    A = {A fgetl(fid)};\nend]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>What he finds is that after the loop, A only has two components, no matter what the file length. The second component is the last line of the file, and the first component is another cell array! He then realizes that A{1} also has two components, where the second component is the second-last line of the file and the first component is yet another cell array!</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Your task: write a function to undo this \"cell-array Inception\" and return the proper cell array of strings that Jimmy is looking for. Implement B = unInception(A), where A is the cell array as returned by Jimmy's code.</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>"}]}

Solve

Solution Stats

105 Solutions
25 Solvers

Last Solution submitted on Nov 16, 2021

Last 200 Solutions

Problem Comments

Solution Comments

Solution 6872149

1 Comment

1 Comment

Dyuman Joshi on 11 Nov 2021 at 7:12

A generalised approach

Problem Recent Solvers25

Problem Tags

Community Treasure Hunt

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

Start Hunting!

Problem 552. Cell Array Inception?

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers25

Suggested Problems

More from this Author1

Problem Tags

Community Treasure Hunt

Problem 552. Cell Array Inception?

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers25

Suggested Problems

More from this Author1

Problem Tags

Community Treasure Hunt

Players