MATLAB: Is there a method to make a copy of an object of a class inheriting from the handle class in MATLAB 7.6 (R2008a)

classcopyhandleMATLABmcosobjectooporiented

I would like to make a copy of an object of the MATLAB handle class – and I would like to know which method I can use to do this.

Best Answer

This enhancement has been incorporated in Release 2011a (R2011a). For previous product releases, read below for any possible workarounds:

There is no method to this in MATLAB 7.6 (R2008a). You could create a default copy method that just copies properties according to the way values are copied. This method could be put this in a base class.

However, this should be avoided as in "handle" class because handles are most often used to represent unique classes (like Simulink blocks or Handle graphic objects) where it is not possible (or allowed) for all properties of the class to have exactly the same values in 2 or more instances.

Related Solutions

MATLAB: How to expose the methods of the MATLAB object-oriented class through a C++ shared library with the MATLAB Compiler

The ability to directly generate a C++ class from a MATLAB class is currently not available as of MATLAB Compiler R2013a.

As a workaround, it is possible to write wrapper function MATLAB files around each of your MATLAB class methods and compile these into a C++ library. The wrapper functions should be written in such a way that:

1) If necessary, instances of your class are instantiated when the functions are invoked

2) The instances are made global such that methods may be invoked on the same class instance across calls to the MATLAB wrapper functions from C++.

Additionally, you may also write a C++ class whose methods wrap around the exported functions of the library in order to instantiate, invoke, and destroy your MATLAB class instances as necessary.

MATLAB: Is assignment to a cell array of objects class property slow in MATLAB 7.6 (R2008a)

This bug has been fixed in Release 2011a (R2011a). For previous product releases, read below for any possible workarounds:

When the variable used to aggregate objects is a property of the current object, there are a number of permissions checks and bookkeeping that needs to be done, resulting in the reported performance decrease in MATLAB 7.6 (R2008a).

As a workaround, use a local variable within the loop to create the array of objects and assign it to the property at the end of the loop. This will minimize the number of checks required and should greatly improve performance. For example,

classdef cellClass < handle
      properties
          basecell = cell(1,1000);
      end
      methods
          function obj = createCellFast(obj)
              for i = 1:1000
                  newbase = baseClass(4,5,6);
                  basecell{i} = newbase;
              end
              obj.basecell = basecell;
          end
      end
end

Best Answer

Related Solutions

MATLAB: How to expose the methods of the MATLAB object-oriented class through a C++ shared library with the MATLAB Compiler

MATLAB: Is assignment to a cell array of objects class property slow in MATLAB 7.6 (R2008a)

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