Problem 44381. Cache me Outside

Created by @bmtran (Bryant Tran)

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","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\"?><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>The test suite includes a simple recursive Fibonacci sequence generator, but it's terribly inefficient. One simple method for improving its performance is using a technique called memoization. Write a function that takes a function_handle that we wish to memoize and returns a function_handle to a memoized version of the initial handle.</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

370 Solutions
94 Solvers

Last Solution submitted on Sep 17, 2023

Last 200 Solutions

Problem Comments

6 Comments

6 Comments

Show 3 older comments

@bmtran (Bryant Tran) on 17 Oct 2017

Whoops, accidentally had the answer in the test suite. Fixed now.

Paul Dostert on 20 Oct 2017

Bryant,

Any chance you can elaborate a bit? I can make a memoized fibonacci code, but that's not really what you're asking. I don't get what the function call with 2 arguments (and 2nd argument the function itself) is in the test set: seq = memfib(n-1, memfib);

Sorry for the confusion.

James on 2 Nov 2017

Paul, it uses a feature that was just introduced in R2017a. If the answer hadn't accidentally been in the test suite, I never would have figured this one out either!

Andrew Newell on 7 Dec 2017

I tried comparing this code with a non-memoized version, and it was 6 times slower!

Hans Kramer on 25 Apr 2018

Love the name of the problem.^^

Dyuman Joshi on 16 Sep 2021

As difficult as the problem looks, (one of the) solution is quite easy and straight forward.

Solution Comments

Show comments

Problem Recent Solvers94

Problem Tags

Community Treasure Hunt

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

Start Hunting!

Problem 44381. Cache me Outside

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers94

Suggested Problems

More from this Author56

Problem Tags

Community Treasure Hunt

Problem 44381. Cache me Outside

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers94

Suggested Problems

More from this Author56

Problem Tags

Community Treasure Hunt

Players