MATLAB Function Reference

isa

Detect an object of a given MATLAB class or Java class

Syntax

K = isa(obj,'class_name')

Description

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

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

cell	Cell array
char	Characters array
double	Double-precision floating-point array
function_handle	Function Handle
int8	8-bit signed integer array
int16	16-bit signed integer array
int32	32-bit signed integer array
numeric	Integer or floating-point array
single	Single-precision floating-point array
sparse	2-D real (or complex) sparse array
struct	Structure array
uint8	8-bit unsigned integer array
uint16	16-bit unsigned integer array
uint32	32-bit unsigned integer array

You cannot use isa to identify a logical value. Use islogical for this instead.

Examples

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

The following example creates an instance of the user-defined MATLAB class, named polynom. The isa function identifies the object as being of the polynom class.

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

See Also

class,is

is*

isappdata