How to create multiple objects and add values in a for loop?

I have the following function which take as inputs the name of the feature I want to examine on my data and its corresponding class I have created.

    classdef FeatureManager < handle

      properties
          features;
          dimensions;
          isRun;
      end
      methods
          function obj = FeatureManager()
              obj.isRun = false;
          end
    function addFeature(obj,featureName,featureClass)
                if isfield(obj.features,featureName)
                    warning(['feature name ' featureName ' was already registered, overwriting']);
                end
                obj.features.(featureName) = featureClass;
                obj.isRun = false;
            end
      end
  end

In another script I have created a cell array with the names of the features I want to examine. In a for loop I try to automatically assign each name and the name of its class to the object.

    mgr = FeatureManager();

    for i = numel(DwtNames)
            for lvl = 3:5
                mgr.addFeature([DwtNames{i},'_',num2str(lvl)], DwtFeature(lvl,DwtNames{i}));
            end
    end
The DwtFeature Class:

classdef DwtFeature < Feature
    properties
        type;
        lvl;
    end

      methods
          function obj = DwtFeature(lvl,type)
              if ~any(strcmp(type,{'haar','db8','sym4','sym8','bior1.3',...
                      'bior2.2','coif3','coif4'}))
                  error(['unsupported DWT type ' type ]);
              end
              obj.type = type;
              obj.lvl = lvl;
          end
          function featureSize = init(obj,dataSize)
              data = rand(dataSize,1);
              res = wavedec(data,obj.lvl,obj.type);
              featureSize = length(res(:));
          end
          function features = run(obj,data)
              features = wavedec(data,obj.lvl,obj.type);
          end

      end
  end

But the problem is that only the last features are written as these overwrite the previous feature names. How can I overcome this problem ?

Thank you in advance!

[Adam]

This seems like one of those many problems that would be trivial to spot the problem using the debugger far more so than just staring at code trying to work out what is wrong.

Just put breakpoints in on key lines, check what featureName is being passed to your function each time and follow it through to see when/why the same feature name is being overwritten or others are not being written at all.

Answer 1

[Guillaume]

I can't reproduce the problem with the code you've posted:

>> DwtNames = {'a', 'b', 'c'};                  %dummy names
>> DwtFeature = @(l, n) sprintf('%s_%d', n, l); %dummy function that doesn't do much
>> mgr = FeatureManager();
   for i = numel(DwtNames)
          for lvl = 3:5
              mgr.addFeature([DwtNames{i},'_',num2str(lvl)], DwtFeature(lvl,DwtNames{i}));
          end
   end
>> mgr 
mgr = 
  FeatureManager with properties:
      features: [1×1 struct]
    dimensions: []
         isRun: 0

>> mgr.features  
ans =   
  struct with fields:  
    c_3: 'c_3'
    c_4: 'c_4'
    c_5: 'c_5'

All three fields were created.

[Ioannis Agalliadis]

I found my mistake. Next time I will try to be more meticulous with my indices as I forgot for my variable 'i' to increase from start till the end. What I should write is:

for *i = 1:numel(DwtNames)*
    for lvl = 3:5
       mgr.addFeature([strrep(DwtNames{i},'.',''),'_',num2str(lvl)], DwtFeature(lvl,DwtNames{i}));
    end
end

Thanks for your help, and sorry for wasting your time.