MATLAB: How to add an array in a structure as a new field

Question

Hi,

I'm using the following code to get a structure variable stats, that will have 23 + 1 = 24 fields.

 stats = regionprops(bw,'All');
 [labeled, nObject] = bwlabel(bw);
 for i = 1:nObject
     stats(i).Ratio = stats(i).MinorAxisLength/stats(i).MajorAxisLength;
 end

The for loop is too slow, because I'm dealing with a huge number of regions, and I have to speed up my code. I tried with this line:

 stats(:).AxisRatio=[stats.MinorAxisLength]'./[stats.MajorAxisLength]';

and many others, with no success.

Therefore, is there a way to add the 24th field to the structure more rapidly? In other words, I need the reverse operation than:

 prop_array = [struct.prop_field]';

Thanks for your answers.

Answer 1

E.g.,

c = num2cell([stats.MinorAxisLength]./[stats.MajorAxisLength]);
[stats.Ratio] = c{:};