Problem 1148. Compression: Encode and Decode

Created by Richard Zapor

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>This Challenge is to compress an array created by randi(2^32-1,1000) and then decompress your data file.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>The first call will provide the array x. The output is the filename of the data encoded file.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>The second call will provide the filename. The output is the numeric array by decoding the file.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Success:</w:t></w:r><w:r><w:t> File size less than 4,100,000 bytes and a correct decoded array.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Scoring:</w:t></w:r><w:r><w:t> Scaled file size.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Encode Call:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Input:</w:t></w:r><w:r><w:t> x % randi(2^32-1,1000)</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Output:</w:t></w:r><w:r><w:t> filename</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>. .</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Decode Call:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Input:</w:t></w:r><w:r><w:t> filename</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Output:</w:t></w:r><w:r><w:t> x_array</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Note: global and persistent are not allowed. Unexpected files will cause a Virus Detect Failure.</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

55 Solutions
11 Solvers

Last Solution submitted on May 14, 2021

Last 200 Solutions

Problem Comments

Solution Comments

Solution 182930

1 Comment

1 Comment

Richard Zapor on 29 Dec 2012

My "Avoid 0 size solutions" portion in the test suite was far too tempting. Nice haha.

Solution 182789

1 Comment

1 Comment

Richard Zapor on 29 Dec 2012

Always fun to see the inventiveness of alternate solutions.

Solution 182779

2 Comments

2 Comments

Jean-Marie Sainthillier on 4 Mar 2014

You use the filename to encode a small part of the data. Very smart !

Jean-Marie Sainthillier on 3 Aug 2014

I like to come back to this WONDERFUL solution from time to time. In my top 10.

Problem Recent Solvers11

Problem Tags

Community Treasure Hunt

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

Start Hunting!

Problem 1148. Compression: Encode and Decode

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers11

Suggested Problems

More from this Author247

Problem Tags

Community Treasure Hunt

Problem 1148. Compression: Encode and Decode

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers11

Suggested Problems

More from this Author247

Problem Tags

Community Treasure Hunt

Players