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Thread: How to compare two objects?

  1. #1 How to compare two objects? 
    New Member
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    Jul 2013
    Dear all,

    Please help me with finding a formal definition of what an object is and how to compare two objects.

    To illustrate, if one is asked to compare, for example, two balls given to him or her, the comparison will be between the balls properties (size, weight, color, material they are made of, etc.). It is impossible to compare just objects without comparing their properties. We know it from day-to-day life, although I need references to formal definitions of “object” and “object comparison”. I dag tons of materials available on-line, mainly related to philosophy art, but didn’t find clear definitions neither for an object nor for objects comparison. All explanations of what an object is and how the objects are compared are quite extensive and only lead to the awareness of these concepts but to their clear definition. I am asking you for a reference to clear and short statements of what an object is and how to compare objects. Particularly, I would be more than happy if someone could provide a reference just stating something like “Objects are compared by comparing their properties”. It would be enough, but I need a reference to only a monograph with the author(s) known in the scientific world, or an encyclopedia, or a university textbook, or an article in a scientific publication or something similar, but not to a Wikipedia or the like…

    Thank you in advance

    Sincerely yours
    Natalia from RU

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  3. #2  
    Ascended Member Ascended's Avatar
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    Apr 2012
    Ok then lets see, to get a formal definintion of 'object' is fairly simple, there are many well respected dictionaries online that provide this such as: object: definition of object in Oxford dictionary (British & World English).

    But also possibly of more interest is the fact that the terms 'object comparison' or 'compare object' are fairly common in computer science and crop up in many programming languages.

    However to comply with your request for a short statement directly refering to object comparison perhaps the following may suffice:

    "Object Classes are formal categories in the classic sense, where membership in a class is completely determined by the presence or absence of features of an object. In object classes, these features are attributes which are the data structures of an object, or defined behaviors which are the internal methods or external operations the object can perform [1, 3, 6, 7] . During the design of new systems, designers are encouraged to constantly move features up in the hierarchies they design and to construct abstract generic classes which perform general operations [12] . To actually meet system goals, designers should create descendants of the generic classes and the descendants should have particular specialized values in their attributes which override their ancestors defaults [3, 7] . When adding to an existing hierarchy, designers should not edit existing classes, but should create new specialized classes that override existing features [7] . Both of these tactics will tend to generate deep and narrow object class hierarchies, with the most important attributes at high levels of abstraction. Compared to the well-defined, rigid classes of current object oriented paradigms, the psychological categories and concepts explored in research are very different. These categories are largely ill-defined and vague, organized around clusters of correlated attributes, and strongly shaped by the reasoner's goals and the context in which the reasoning occurs [8, 13] . People have "basic level" categories wherein most of the attributes of the category are found. In hierarchies of related objects, these basic level categories are an anchoring level of abstraction in which the most concrete image of the category as a whole is found. Both superordinate and subordinate classes have fewer features [11] ."

    Source: Conflicting Class Structures between the Object Oriented Paradigm and Users Concepts

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  4. #3  
    Genius Duck Moderator Dywyddyr's Avatar
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    Jan 2013
    Scunthorpe, UK
    Quote Originally Posted by Natalia_RU View Post
    It is impossible to compare just objects without comparing their properties.
    I'm not surprised.
    If their properties didn't differ (weren't comparable/ contrastable) then they'd be the same object.
    "[Dywyddyr] makes a grumpy bastard like me seem like a happy go lucky scamp" - PhDemon
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