![]() Next, it checks whether the handle 'a' pointing to the axes object exists or not. After that the 'delete' function deletes the axes. This code first creates an axes object using the 'axes' function and then plot the data specified by 'x' and 'y'. Output Does the handle 'a' still exist? Yes % Determine if the handle still exists or notįprintf('Does the handle 'a' still exist? ') ![]() % MATLAB code to delete an object pointed by a handle Let us consider an example to understand this concept. Therefore, deleting an object removes the object from the workspace, but it does not remove the handle pointing to the object. However, this handle becomes invalid or null, as the object that it is pointing is no longer present. In MATLAB, if we delete an object pointed by a handle, in that case the handle that pointing the object can still present in the workspace. This is how we can check if the given object is a handle or not in MATLAB. the value '0' for the object 'b' represents that 'b' is not a function handle, but it is a variable. Here, the value '1' for the object 'a' is representing that 'a' is a function handle which is pointing to a function 'f' as created by using The second result, i.e. % Determine if the objects are a handle or notįprintf('Determining for the object a:') įprintf('Determining for the object b:') Let us consider an example to understand this behavior of the handle in MATLAB % MATLAB code to check if an object is a handle If the specified object is a handle, then the function will return True otherwise False. The output of this function is a Boolean value, i.e. This function takes the following syntax: isa(object_name, 'handle') In MATLAB, there is a built-in function 'isa' which is used to determine whether the specified object is a handle or not. In this example, we have modified the function handle 'fh' by using the built-in function 'sum' to calculate the sum of two numbers. This code demonstrates that we can easily modify the function handle using a function. % Calculate the sum using the function handle % MATLAB code to modify handles using functionsįh = Specify values for which the sum to be calculated Let us consider an example to understand this behavior of function handle in MATLAB. Overall, in MATLAB, when we alter an object using a function handle, then we are actually modifying the object that is pointed by this function handle. This happens because we are dealing with the same object, just with a different name. Thus, when we pass a function handle which is pointing to a function, then any modification that we do in the object inside the function will also affect the original object exist outside the function. In other words, we can utilize a function handle to change the objects directly. In MATLAB, we can also change/modify the function handles using functions. Hence, this explains that when a copied function handle is used, then it also points to the same object as the original function handle. We can see that the output generated from the both function handle is the same. Then, we create a function handle 'fun_handle' to call the function and display the result using this function handle.Īfter that, we create a copy of this function handle as 'copy_fh' and display the result using this copied function handle. In this MATLAB code, we have first defined a function 'f' to calculate square of a number 'a'. % Display the square of a number using the copied function handle % MATLAB program to explain copies of handle objectįun_handle = Display the square of a number using the original function handle using original handle: %d ExampleĬonsider the following MATLAB code to understand this behavior of MATLAB handle object. When we create multiple copies of a handle in MATLAB, the copies of the handle will also point to the same object as the original handle. ![]() Now, let us discuss the behavior of handle object. Overall, the handle is a type of object in MATLAB programming which is used to store the reference to an object. The use of handles in a MATLAB program makes it more memory efficient because it does not require copying the entire data of the object. Therefore, when any change is made in the object's property, it will reflect across all the references. ![]() In MATLAB programming, the handles are passed by reference instead of value. Handles in MATLAB also allows us to pass a function as an input argument of some other function. In MATLAB, there is a data type called 'Handle' which is used to point an object. MATLAB is an object-oriented programming (OOP) language that allows us to create objects and define their behavior.
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