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How to use memoization in MatLab?

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Solarmew
Solarmew 2015-5-19
评论： Walter Roberson 2018-7-24
if I have some function substantially more complicated than
function out = y(x)
out = 2*x;
end
but let's just go with this one... is there a way to save the value y(1) for example, so that if I call y(5) and then y(1) again, it's not going to CALCULATE y(1) but pull it from memory? Maybe have a function create a separate variable "y1" and store it? The problem is that I would like to not have to create empty variable BEFORE running the function (because i may not know what names they should have), i want it to create them by itself. Is there a way to do it? I guess one way would be to maybe create an empty array "y" and then store each value in its respective cell? So solution to y(1) would go to cell #1 in the array, and so on... This doesn't feel right tho. And I still don't know how that would prevent the function from doing the same calculation over and over again rather than just doing it once.
Any hints would be appreciated :]

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回答（2 个）

per isakson
per isakson 2015-5-19
编辑：per isakson 2015-5-19
Prabhakar
Prabhakar 2018-7-24
Memoize was added to MATLAB in R2017a.
The documentation is a good resource to begin with, or if you prefer here is a blog which walks you through it.

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