Calling an object's method that changes its property not doing what I want.

2011 12 16
2 个回答
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1 个投票

Hello
An object has property MNL_beta and method train(input, output) that I want the object to update its MNL_beta property. What is actually happening is :
>> p1
p1 =
predictor_bundle
Properties:
MNL_beta: []
Methods
>> p1.train(input, output)
ans =
predictor_bundle
Properties:
MNL_beta: [3x1 double]
Methods
>> p1
p1 =
predictor_bundle
Properties:
MNL_beta: []
Methods
What has happened? The p1's value has not changed at all?!?
>> p1 = p1.train(input, output)
p1 =
predictor_bundle
Properties:
MNL_beta: [3x1 double]
Methods
>> p1
p1 =
predictor_bundle
Properties:
MNL_beta: [3x1 double]
Methods
But using the second syntax, it's done what I wanted. How do I accomplish the result of the second method, while using the syntax of the first method?
Thank you

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Chirag Gupta
Chirag Gupta 2011-12-16

1 个投票

This would stem from the difference between Value classes and handle classes. Its explained here: http://www.mathworks.com/help/techdoc/matlab_oop/brfylwk-1.html

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Evan
Evan 2011-12-16
And so how would I exactly solve the problem?
My classdef is written as such :
classdef predictor_bundle
properties
MNL_beta
end
method
function obj = train(obj, input, output)
function here
end
end
end

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Evan
Evan 2011-12-16

0 个投票

Hello,
Here is my classdef code. What modifications would I need to make to solve the problem?
classdef predictor_bundle
properties
MNL_beta;
end
methods
function obj = predictor_bundle()
end
function obj = train(obj, input, output)
Function here.
end
end
end

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