Addition of time series' values in array

Hello,

I have a tricky one I haven't been able to solve. I have an array of objects of a specific class. One of the properties of this class is a time series. I can guarantee that all the time series for that particular property for all objects in the array have exactly the same time vector. I would like to sum all the values of that property (i.e. of those time series) into a single time series with the same time vector.

For example, I have an array OBJECTS composed of objects of class OBJ with property PROP of type timeseries. I want to add all the data values of the PROP time series.

I tried the following:

sum(OBJECTS(:).PROP.Data)

but didn't work. I'm not sure about the OBJECTS(:) part, in particular the (:). I made several different tests, also playing with the dimension for sum (first or second) but without success.

Any ideas? Thanks in advance for any suggestion.

[per isakson]

What happend? Did you get an error message?

Answer 1

[Laurens Bakker]

Why not just use a for loop?

sum = zeros( size(OBJECTS(1).PROP.Data );
for obj=OBJECTS
    sum = sum + obj.PROP.Data;
end

[David]

I am currently using a loop as a work-around, but I was hoping to use SUM as it should be much faster. But thanks for the suggestion.

Answer 2

[owr]

The double level of "." indexing could cause an issue, but if it was just single level this trick might work:

>> foo(1).data = rand(5,1);
>> foo(2).data = rand(5,1);
>> foo(:).data

ans =

      0.7577
      0.7431
      0.3922
      0.6555
      0.1712

ans =

      0.7060
      0.0318
      0.2769
      0.0462
      0.0971

>> [foo(:).data]

ans =

      0.7577    0.7060
      0.7431    0.0318
      0.3922    0.2769
      0.6555    0.0462
      0.1712    0.0971

>> sum([foo(:).data],2)

ans =

      1.4638
      0.7750
      0.6692
      0.7016
      0.2683