Automatically update class properties

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Simon Baeuerle
Simon Baeuerle 2022-11-14
评论： Matt J 2022-11-16
Hey there,
I've got the following problem: I've got a class with two properties A and B, which dependent on other properties hmatrix and n_FFT. Here is a minimal example:
classdef example
properties
hmatrix
n_FFT
A
B
end
methods
function obj = example()
obj.B = 10.*2^6;
obj.hmatrix = [0,1];
obj.n_FFT = 2^6;
end
function obj = set.hmatrix(obj,value)
obj.hmatrix = value;
obj.A = value.*obj.B;
end
function obj = set.n_FFT(obj,value)
obj.n_FFT = value;
obj.B = 10.*value;
obj.A = obj.hmatrix.*obj.B;
end
end
end
The property B depends on n_FFT and the property A depends on hmatrix and n_FFT (default values in constructor help when initializing).
Due to performance issues, I only want to recompute B and especially the property A (its more complicated than shown here), if the variables hmatrix and n_FFT change. Otherwise, I could do this by simply writing some get methods for the variables.
This code above runs, but the code analyzer is complaining that set methods should not access other properties, due to load order issues.
Is there a clean, "proper" way to do this, where I do not use get methods? I looked into dependent and transient properties but could not figure out how to use them without writing get methods, which are called every time.
Thank you very much! I

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采纳的回答

Matt J
Matt J 2022-11-14
编辑：Matt J 2022-11-14
  2 个评论
Simon Baeuerle
Simon Baeuerle 2022-11-16
Thank you for the link and for your reply! However, my problem is not an infinite recursion. The code analyzer tells me to not access other properties in a set method, which are not dependent. I can't see how this example helps me w.r.t. that concern. Do you have any suggestions. Sorry - I am a little bit lost here.
Matt J
Matt J 2022-11-16
classdef example
properties
hmatrix_
n_FFT_
A_
B_
end
properties (Dependent)
hmatrix
n_FFT
A
B
end
methods
function obj = example()
obj.B = 10.*2^6;
obj.hmatrix = [0,1];
obj.n_FFT = 2^6;
end
function obj = set.hmatrix(obj,value)
obj.hmatrix_ = value;
obj.A_ = value.*obj.B_;
end
function obj = set.n_FFT(obj,value)
obj.n_FFT_ = value;
obj.B_ = 10.*value;
obj.A_ = obj.hmatrix.*obj.B_;
end
end
end

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