setting object properties value for object array in matlab

Question

I have created an array of objects and I would like assign a property value in a vector operation without using a for loop. Unfortunately I get an error.

A simplifi

Answer 1

I think you'll find your answer here in "Struct array errors." Even though this is a class, similar rules apply.

Unfortunately missing [] is not the cause, since adding them causes more errors. The cause is that you cannot assign the same value to all fields of the same name at once, you must do it one at a time, as in the following code:

So you'll need:

for ii=1:100
  vecMyArray(ii).dblMyProperty1 = ii;
end

I know it's not satisfying, but I think it at least helps us to definitively understand this error.

Answer 2

I see what you're trying to do now. Use disperse from the MATLAB File Exchange:

>> [vecMyArray.dblMyProperty1] = disperse(1:100);
>> vecMyArray(1).dblMyProperty1
ans = 
    1
>> vecMyArray(10).dblMyProperty1
ans = 
    10

Answer 3

You can use the deal function for exactly this purpose:

[vecMyArray.dblMyProperty1] = deal(1:100);

See: http://www.mathworks.com/company/newsletters/articles/whats-the-big-deal.html

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Edit: No you can't, actually; that'll set them to all be the vector 1:100.