isa - Determine whether input is object of given class matlab-优快云博客

本文介绍了MATLAB中ISA函数的用法，该函数用于判断输入对象是否为指定类或其子类的对象。文中列举了多种预定义MATLAB类，并通过实例展示了如何使用ISA函数进行对象类型检查。

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isa - Determine whether input is object of given class

Syntax

K = isa(obj, 'class_name')

Description

K = isa(obj, 'class_name') returnslogical 1 (true) if obj isof class (or a subclass of) class_name,and logical 0 (false) otherwise.

The argument obj is a MATLAB objector an object of the Java programming language. The argument class_name isthe name of a MATLAB (predefined or user-defined) or a Java class.Predefined MATLAB classes include

`logical`	Logical array of `true` and `false` values
`char`	Characters array
`numeric`	Integer or floating-point array
`integer`	Signed or unsigned integer array
`int8`	8-bit signed integer array
`uint8`	8-bit unsigned integer array
`int16`	16-bit signed integer array
`uint16`	16-bit unsigned integer array
`int32`	32-bit signed integer array
`uint32`	32-bit unsigned integer array
`int64`	64-bit signed integer array
`uint64`	64-bit unsigned integer array
`float`	Single- or double-precision floating-point array
`single`	Single-precision floating-point array
`double`	Double-precision floating-point array
`cell`	Cell array
`struct`	Structure array
`function_handle`	Function handle
'`class_name`'	MATLAB class or Java class

To check for a sparse array, use issparse.To check for a complex array, use ~isreal.

Examples

isa(rand(3,4),'double')
ans =
    1

The following example creates an instance of the user-defined MATLAB classnamed polynom. The isa functionidentifies the object as being of the polynom class.

polynom_obj = polynom([1 0 -2 -5]);
isa(polynom_obj, 'polynom')
ans =
     1