How do I retrieve individual elements from an object all at once?

Hi all,

I have an Object where I'd like to retrieve all elements at once instead of through a loop.

My object is set up like this:

ObjArr
# Item one First Name
# Item two Last Name

Instead of using code like this...

 for k = 1:n
    tempSTR{k} = ObjArr(k).Name;
 end

...I'd like to use something like the code below to quickly pull out a vector of data across all elements.

 tempSTR{} = ObjArr.Name;

Please help.

Thanks,

jason

Answer 1

[Sven]

If the contents of your object's field is numeric, you can make a matrix like this:

myNumVector = [Object.myNum];

To get a cell of non-numeric data such as strings (or a cell of anything, really), just use:

myVarCell = {Object.myVar};

Or, to use your code:

 for k = 1:n
    tempSTR{k} = ObjArr(k).Name;
 end

... can be replaced with:

 tempSTR = {ObjArr.Name};

[Daniel Shub]

I think it should be

tempSTR = {ObjArr(1:n).Name};

Since we don't know how big ObjArris.

[Jason]

Thanks all, both methods work, at least when pre-allcoating the size of the tempSTR. I also have double arrays and using [ ] instead of { } works there.

Answer 2

[Daniel Shub]

Loren's blog has a post about OOP performance. Looping outside the object is slower than looping inside the method. You probably want to overload SUBSREF and get.Name to handle arrays.