Find handle objects - MATLAB - MathWorks Deutschland (2024)

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Find handle objects - MATLAB - MathWorks Deutschland? ›

The findobj function can scan the object hierarchy

h = gco returns the handle of the current object. h = gco(figure_handle) returns the handle of the current object in the figure specified by figure_handle .

Use isgraphics to determine if a variable is a valid graphics object handle. A handle variable ( h in this case) can still exist, but not be a valid handle if the object to which it refers has been deleted.

h = findall( objhandles , prop 1, value 1,..., prop N, value N) returns the handles of all objects in the hierarchy that have the specified properties set to the specified values. For example, h = findall(gcf,'Type','text','Color','r') returns all text objects in the current figure that have a red color.

Use the gcf command to get the current figure handle. surf(peaks) fig = gcf; % current figure handle fig.

Handle objects enable more than one variable to refer to the same object. Handle-object behavior affects what happens when you copy handle objects and when you pass them to functions.

A handle refers to a specific instance of a graphics object. Use the object handle to set and query the values of the object properties. When you create graphics objects, you can save the handle to the object in a variable.

To create a function handle, use the @ operator. For example, create a handle to an anonymous function that evaluates the expression x² – y²: f = @(x,y) (x. ^2 - y.

Hmatch = findobj( H ,'-class', class ) finds all objects belonging to the specified class. Hmatch = findobj( H ,'-isa', class ) finds all objects belonging to the specified class.

The findobj function can scan the object hierarchy to obtain the handles of objects that have specific property values. For identification, all graphics objects have a Tag property that you can set to any character vector. You can then search for the specific property/value pair.

What is handle in MATLAB class? ›

A handle is a variable that refers to an object of a handle class. Multiple variables can refer to the same object.

Equality of Handle Objects

You can use == and isequal to test for two different relationships among handle objects: The handles refer to the same object: == and isequal return true . The handles refer to objects of the same class that have the same values, but are not the same objects — only isequal returns true .

ht = matlabFunction( f ) converts the symbolic expression or function f to a MATLAB^® function with handle ht . If there is an equivalent MATLAB function operating on the double data type for the symbolic expression or function, then the converted function can be used without Symbolic Math Toolbox™.

A function handle is a MATLAB^® data type that represents a function. A typical use of function handles is to pass a function to another function. For example, you can use function handles as input arguments to functions that evaluate mathematical expressions over a range of values.

Figure handles. To create a figure, use the figure function like so: >> fhandle = figure; This creates a new figure window and stores all the figure data in the variable fhandle.