How to Use sort to Sort an Array of Custom Class Objects in MATLAB？

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jia
jia 2024-7-16
编辑： Stephen23 2024-7-16
I have already overloaded the eq, lt, and gt methods in my class definition, but I am still encountering an issue when trying to sort using the sort function.
error sort
Incorrect number or types of inputs or outputs for function sort.
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jia
jia 2024-7-16
classdef PointGroupElement
% POINTGROUPELEMENT is an element of a point group
%
% Parameters
% ------
% R : Real space rotation action of the operator. Square matrix with
% size of the number of spatial demension.
% conjugate : boolean (default false)
properties
R;
conjugate;
antisymmetry;
U;
end
methods
function obj = PointGroupElement(R,options)
arguments
R (:,:) double;
options.conjugate (1,1) logical = false;
options.antisymmetry (1,1) logical = false;
options.U (:,:) = [];
end
[obj.R,obj.conjugate,obj.antisymmetry,obj.U] = deal(real(R),options.conjugate,options.antisymmetry,options.U);
end
function eq_g = eq(obj,g)
arguments
obj ;
g ;
end
eq_g = arrayfun(@(x) eq_(x,g),obj);
function eq_AB = eq_(A,B)
R_eq = norm(A.R-B.R)<1e-5;
basic_eq = R_eq && (A.antisymmetry==B.antisymmetry) && (A.conjugate==B.conjugate);
U_eq = norm(A.U-B.U)<1e-5;
eq_AB = U_eq && basic_eq;
end
end
function result = lt(obj,g)
result = arrayfun(@(x) lt_(x,g),obj);
function result_ = lt_(A,B)
if ~isequal([A.conjugate,A.antisymmetry],[B.conjugate,B.antisymmetry])
if A.conjugate<B.conjugate
result_ = true;
elseif (A.antisymmetry < B.antisymmetry) && A.conjugate==B.conjugate
result_ = true;
else
result_ = false;
end
else
result_ = string(char(reshape(A.R,1,[])))<string(char(reshape(B.R,1,[])));
end
end
end
function result = gt(obj,g)
result = ~(eq(obj,g) + lt(obj,g));
end
end
end
R1 = eye(3);
g = PointGroupElement(R1);
R2 = -R1;
g1 = PointGroupElement(R2);
g1<g2 % 0
g1>g2 % 1
g1==g2 % 0
sort([g1,g2])
% Error using sort
% Incorrect number or types of inputs or outputs for function sort.
Stephen23
Stephen23 2024-7-16
编辑：Stephen23 2024-7-16
"I have already overloaded the eq, lt, and gt methods in my class definition"
Why? AFAIK SORT does not use them.
Just define a SORT method.

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回答（1 个）

Divyam
Divyam 2024-7-16
编辑：Divyam 2024-7-16
Ran in:
Hi Jia, ensure that your custom class is defined in a ".m" file with name as the class name. "MyClass.m" has been attached as the reference class for the code below.
To test sorting, the following code was created in a different MATLAB file in the same directory where the class was defined.
% Creating an array of custom class objects
array = [MyClass(5), MyClass(2), MyClass(8), MyClass(3)];
% Extracting the "Value" of the objects in an array using the arrayfun method
valuesExtract = arrayfun(@(obj) obj.Value, array);
% Sorting the values to get the sorted indices
[~, sortedIndices] = sort(valuesExtract);
% Reorder the array based on the sorted indices
sortedArray = array(sortedIndices);
% Displaying the sorted values
for i = 1:length(sortedArray)
fprintf("%d ", sortedArray(i).Value);
end
2 3 5 8
The issue might be caused by not using "arrayfun" to extract the "Value" property which has to be compared and comparing the property directly.
For more information regarding the use of "arrayfun" method refer to the following documentation: https://www.mathworks.com/help/matlab/ref/arrayfun.html

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