Problem 1731. Text File Read: 64 bit data set

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 read a text file that has vary large integers up to 2e18, typical for</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://code.google.com/codejam/contests.html\"><w:r><w:t>Google Code Jam</w:t></w:r></w:hyperlink><w:r><w:t>. These values are well within the bounds of uint64.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>The data is an array of Q pairs.</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> [Q, fname] The number of lines in the file and its 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> M a uint64 matrix of size(Q,2)</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>Example:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[Input: {4, 'Cody_64.txt']\nThe text file:\n308436464205151562 1850618785230909388\n373665302816212423 1494661211264849698\n760961177192651897 1521922354385303795\n1 2000000000000000000\n\nOuput: A uint64 (4,2) matrix to full precision.]]></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>Note of Warning:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>The fscanf function with %ul may not succeed, as of 7/20/2013.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>The result window has a case showing the function output</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>Related Challenges:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[1) Bullseye Large Numbers r<1E18, P<2E18\n2) Super Large Numbers >2^64 (Java BigInteger methods)]]></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>"}]}

This Challenge is to read a text file that has vary large integers up to 2e18, typical for <a href = "http://code.google.com/codejam/contests.html">Google Code Jam</a>. These values are well within the bounds of uint64.The data is an array of Q pairs.Input: [Q, fname] The number of lines in the file and its filename.Output: M a uint64 matrix of size(Q,2)Example:<pre class="language-matlab">Input: {4, 'Cody_64.txt']
The text file:
308436464205151562 1850618785230909388
373665302816212423 1494661211264849698
760961177192651897 1521922354385303795
1 2000000000000000000
</pre><pre class="language-matlab">Ouput: A uint64 (4,2) matrix to full precision.
</pre>Note of Warning:The fscanf function with %ul may not succeed, as of 7/20/2013.The result window has a case showing the function outputRelated Challenges:<pre class="language-matlab">1) Bullseye Large Numbers r&lt;1E18, P&lt;2E18
2) Super Large Numbers >2^64 (Java BigInteger methods)
</pre>

Solve

Solution Stats

92 Solutions
12 Solvers

Last Solution submitted on Dec 27, 2021

Last 200 Solutions

Problem Comments

1 Comment

1 Comment

Nikolaos Nikolaou on 27 Dec 2021 at 12:11

That was painful to lear xD .
Btw i really think its about time some document the capabilities of str2num properly ( i mean the eval like capabilties)

Solution Comments

Solution 286930

3 Comments

3 Comments

Richard Zapor on 22 Jul 2013

Nice find in sscanf.

J.R.! Menzinger on 23 Jul 2013

;-)

J.R.! Menzinger on 23 Jul 2013

I used to read very much on Matlab's help, but since I play Cody, I read it a lot of times MORE!!! :-D

Problem Recent Solvers12

Problem Tags

%u64 cell array char fopen fscanf str2num textscan uint64 ul

Community Treasure Hunt

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

Start Hunting!

Problem 1731. Text File Read: 64 bit data set

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers12

Suggested Problems

More from this Author255

Problem Tags

Community Treasure Hunt

Problem 1731. Text File Read: 64 bit data set

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers12

Suggested Problems

More from this Author255

Problem Tags

Community Treasure Hunt

Players