How to efficiently preallocate an array of handle objects

Hi, I'm looking a fast and proper method to preallocate an array of objects, where the corresponding class is a handle class.

So far, I came across the following methods. But I'm not sure whether all of them are really preallocating the needed space.

1) Is this really preallocating the needed space?

x=myClass.empty(1e5,0);

2)

x(1:1e5) = myClass( param1, param2 );

3) I think this only work if the constructor accept nargin=0, right?

x(1e5) = myClass( param1, param2 );

4) In the case the class also inherits from matlab.mixin.Copyable

x= repmat( copy( myClass( param1, param2), 1e5,1 );

Answer 1

[Disciple of the Forbidden Spell]

To preallocate the object array, assign the last element of the array first. MATLAB® fills the first to penultimate array elements with default ObjectArray objects.

From Construct Object Arrays

[Guillaume]

This is option #3 in the question. As the OP stated, it only works if the constructor is designed to accept 0 arguments.

Furthermore, the behaviour for handle object is far from ideal. You'll end up with an array of n-1 duplicate handles and a different handle at the end, instead of n different handles, as explained in the doc.

[broken_arrow]

So which method would be considered best practice in this case?