![]() ![]() Imagine you have a matrix A =, then assign that via B = A. The reason they have both in Matlab is that in Matlab you would expect the "value" behaviour natively. "value" classes are always returning a full clone of whatever object (which has been modified by what you just did, e.g. proper object instances with pointers to them. "handle" classes are what your mind is set to. % p2 is also an instance of Polynomial with p's state at assignmentĪnd of a Handle class is % db is an instance of Database To paraphrase their illustration, the behavior of a Value class is % p is an instance of Polynomial The Mathworks has a good rundown on this topic. ![]() Assigning a Handle class instance to a variable create a reference (alias) to that instance.Assigning a Value class instance to a variable creates a copy of that class.Going a bit deeper, the difference between a Value class and a Handle class lies mostly in assignment: Handle classes ( classdef Person < handle) do not need to return the modified object (like returning void): function = set.name(obj,name) that modify the object must return a modified object to copy over the existing object variable". getdisp - Called by get when you call get with no output arguments and a single input parameter containing the handle array.Since your class is currently a subclass of the default Value class, your setters need to return the modified object: function obj = set.name(obj,name)įrom the documention: "If you pass to a function, the function must return the modified object." And in particular: "In value classes, methods.setdisp - Called by set when you call set with no output arguments and a single input parameter containing the handle array.You can customize the way property lists are displayed by redefining the following methods in your subclass: Similarly, you can list the setable properties of the object using set: set(h)ĪccountStatus: Customizing the Property List The standard set/get interface enables you to display all object properties and their current values using get with no output argument and only a handle as input. Invalid value for AccountStatus Listing All Properties This example creates a class with the set/get interface and illustrates the behavior of the inherited methods: classdef MyAccount MyAccount.MyAccount> at 19 You can also pass property-value pairs to set using cell arrays and structures as described for the built–in set function. Each cell corresponds to a property in prop and each cell value is a cell array of possible values, or empty if there is no finite enumeration of possible values. If you specify prop as a cell array of property names, then set returns a cell column vector.If you specify prop as a string containing a property name, then set returns either a cell array of possible values or an empty cell.Each field contains either an empty cell array or a cell array of possible property values (if such a finite set exists). If you specify only H, set returns a struct with one field for each property in the class of H.If you do not specify property values, set returns a cell array of possible values for each requested property when the property value is a finite enumeration of possible values. function S = set(H)įunction set(H,'PropertyName',PropertyValue) The set method assigns values to properties for handles in array H. ![]() If prop is a cell array of string property values, then get returns a cell array of values where each row in the cell corresponds to an element in H and each column in the cell corresponds to an element in prop. The cell array is always a column vector regardless of the shape of H. get returns the value of that property if H is scalar, or returns a cell array of property values if H is an array of handles. If you specify prop as a char array, then MATLAB interprets it as a property name.The value of each field is the value of the corresponding property. Each field in the struct corresponds to a property defined by the class of H. If you do not specify property names, get returns a struct array in which each element corresponds to the element in H.The get method returns property values from a handle array. ![]() See Controlling Property Access for information on property access methods. The set and get methods referred to in this section are different from the property set access and property get access methods. The hgsetget subclass of the handle class provides implementations of these methods that your class can inherit to provide the same set and get functionality. These methods enable you to set or query the value of graphics object properties. The MATLAB Handle Graphics system implements an interface based on set and get methods. ![]()
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