Very Slow Assignment for Clas Properties
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Hi
I have a class with a number of properties. One of the methods for this class which uses these properties is called many times (530,553 times) as part of a sim i run.
Problem is referencing the properties takes up too much cumulative time.
For example I have:
classdef World < handle
properties state = 0;
end
methods
function thisWorld = World()
end
function act(thisWorld)
myState = thisWorld.state; % takes 15 seconds when called 503k end
Another method updates the state property prior to calling the act() method, the values 'state' can be assigned range from 1:1:101.
Please help end
end
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Answers (2)
Daniel Shub
on 6 Aug 2011
This is a well known problem with MATLAB classes. Unfortunately there is not a good solution that I know of. I would suggest starting at:
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Greg
on 15 Aug 2011
1 Comment
Daniel Shub
on 15 Aug 2011
It is a problem. Sometimes you can get around the problem by changing how your code works. For example:
N = 503e3;
thisWorld = World;
for ii = 1:N
myState = thisWorld.state;
end
is much faster than
for ii = 1:N
act(thisWorld);
end
obviously not all problems can be solved this way, but sometimes they can be.
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