MATLAB Object-Oriented Programming

loadobj

Define loadobj as a static method. Create an object by calling the class constructor.

Then assign values to properties from the struct passed to loadobj. Use the data to

regenerate properties that were not saved.

methods(Static)

function obj = loadobj(s)

if isstruct(s)

newObj = ClassConstructor;

newObj.Prop1 = s.Prop1;

newObj.Prop2 = s.Prop2

newObj.GraphHandle = plot(s.Data);

obj = newObj;

else

obj = s;

end

end

end

If the load function encounters an error, load passes loadobj a struct instead of an

object. Your loadobj method must always be able to handle a struct as the input

argument. The input to loadobj is always a scalar.

Handle Load Problems

loadobj can handle a struct input even if you are not using a saveobj method.

The GraphExpression class creates a graph of a MATLAB expression over a specified

range of data. GraphExpression uses its loadobj method to regenerate the graph,

which is not saved with the object.

classdef GraphExpression

properties

FuncHandle

Range

end

methods

function obj = GraphExpression(fh,rg)

obj.FuncHandle = fh;

obj.Range = rg;

makeGraph(obj)

end

13 Saving and Loading Objects