Problem 44381. Cache me Outside

Created by @bmtran (Bryant Tran)

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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.

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Last Solution submitted on Apr 12, 2025

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@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.

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Problem 44381. Cache me Outside

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Problem 44381. Cache me Outside

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