isprop

True if property exists

Syntax

tf = isprop(obj,PropertyName)


Description

tf = isprop(obj,PropertyName) returns true if the specified PropertyName is a property of object obj. Otherwise, isprop returns logical false. Specify PropertyName as a character vector or a string scalar.

If obj is an array, isprop returns a logical array the same size as obj. Each true element of tf corresponds to an element of obj that has the property, PropertyName.

Note

If obj is an empty object or an array of empty objects, isprop returns an empty logical array, even if PropertyName is a property of obj.

While isprop returns true if the class of an object defines a property of that name, classes can control access to property values by defining property attributes. Property access can be defined as:

• Readable and writable

• Read only

• Write only

• Accessible only to certain class methods

Therefore, isprop might indicate that a property exists, but you might not be able to access that property. For more information, see Get Information About Properties.

Examples

This example uses isprop to determine if XDataSource is a property of object h before attempting to set the property value:

h = plot(1:10);
if isprop(h,'XDataSource')
   set(h,'XDataSource','x')
else
   error(['XDataSource not a property of class ',class(h)])
end

Since XDataSource is a property of h, its value is set to 'x'.

Extended Capabilities

C/C++ Code Generation
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