Sysquake Pro – Table of Contents
Sysquake for LaTeX – Table of Contents
Class and Object Functions
class
Object creation.
Syntax
object = class(strct, 'classname') object = class(strct, 'classname', parent1, ...) str = class(object)
Description
class(strct,'classname') makes an object of the specified class with the data of structure strct. Object fields can be accessed only from methods of that class, i.e. functions whose name is classname::methodname. Objects must be created by the class constructor classname::classname.
class(strct,'classname',parent1,...) makes an object of the specified class which inherits fields and methods from one or several other object(s) parent1, ... Parent objects are inserted as additional fields in the object, with the same name as the class. Fields of parent objects cannot be directly accessed by the new object's methods, only by the parent's methods.
class(object) gives the class of object as a string. The table below gives the name of native types.
Class | Native type |
---|---|
double | real or complex double scalar or array |
single | real or complex single scalar or array |
int8/16/32/64 | 8/16/32/64-bit signed integer scalar or array |
uint8/16/32/64 | 8/16/32/64-bit unsigned integer scalar or array |
logical | logical scalar or array |
char | character or character array |
list | list |
cell | cell array |
struct | scalar structure |
structarray | structure array |
inline | inline function |
funref | function reference |
null | null value |
Examples
o1 = class({fld1=1, fld2=rand(4)}, 'c1'); o2 = class({fld3='abc'}, 'c2', o1); class(o2) c2
See also
struct, inferiorto, superiorto, isa, isobject, methods
inferiorto
Set class precedence.
Syntax
inferiorto('class1', ...)
Description
Called in a constructor, inferiorto('class1',...) specifies that the class has a lower precedence than classes whose names are given as input arguments. Precedence is used when a function has object arguments of different classes: the method defined for the class with the highest precedence is called.
See also
isa
Test for an object of a given class.
Syntax
b = isa(object,'classname')
Description
isa(object,'classname') returns true of object is an object of class class, directly or by inheritance. In addition to the class names given by class, the following classes are supported:
Class | Native type |
---|---|
cell | list or cell array |
numeric | double, single or integer scalar or array |
float | double or single scalar or array |
integer | integer scalar or array |
Example
isa(pi,'double') true
See also
isnull
Test for a null value.
Syntax
b = isnull(a)
Description
isnull(a) returns true if a is the null value created with null, or false for any value of any other type.
See also
isobject
Test for an object.
Syntax
b = isobject(a)
Description
object(a) returns true if a is an object created with class.
See also
methods
List of methods for a class.
Syntax
methods classname list = methods('classname')
Description
methods classname displays the list of methods defined for class classname. Inherited methods and private methods are ignored. With an output argument, methods gives produces a list of strings.
See also
null
Null value.
Syntax
obj = null
Description
null gives the only value of the null data type. It stands for the lack of any value. Null values can be tested with isnull or with equality or inequality operators == and ~=.
With an input argument, null(A) gives the null space of matrix A.
Examples
n = null n = null isnull(n) true n == null true n ~= null false class(n) null
See also
superclasses
Get list of superclasses.
Syntax
list = superclasses(obj)
Description
superclasses(obj) gives the list of the names of parent classes (superclasses) of the object obj. Parent classes are specified as additional arguments to class when the object is constructed.
Example
use lti; G = tf(1, [1, 2]); class(G) tf superclasses(G) {'lti'} isa(G, 'lti') true