How to write this class- 'nn-dependent property should not access...' warning

Hi,

I have a class which I define as follows....

classdef problemDef
    properties
        nParams
        params
        paramNames
        paramConstr
    end

      methods
          %Parameters block
          function obj = set.nParams(obj,nParams)
              if (isnan(nParams) || isinf(nParams) || mod(nParams,1) ~= 0)
                  error('nParams must be real integer');
              end
              obj.nParams = nParams;

              if isempty(obj.params)
                  obj.params = zeros(1,nParams);
              elseif (length(obj.params) < nParams)
                  obj = obj.extendNParams(nParams);
              elseif (length(obj.params) > nParams)
                  obj = obj.contractNParams(nParams);
              end

              if isempty(obj.paramNames)
                  obj.paramNames = cell(1,nParams);
              elseif (length(obj.paramNames) < nParams)
                  obj = obj.extendNParamNames(nParams);
              elseif (length(obj.params) > nParams)
                  obj = obj.contractNParamNames(nParams);
              end

              if isempty(obj.paramConstr)
                  obj.paramConstr = cell(1,nParams);            
              elseif (length(obj.paramConstr) < nParams)
                  obj = obj.extendNParamConstr(nParams);
              elseif (length(obj.paramConstr) > nParams)
                 obj = obj.contractNParamConstr(nParams);
              end

          end

          function obj = set.params(obj,val)
              if (length(val) > obj.nParams)
                 error('Length of values vector must be <= nparams');
              elseif (isnumeric(val) == false | isinteger(val) == true)
                  error('Params must be vector of doubles');
              else
                 obj.params = val;
              end
          end

          function obj = set.paramNames(obj,val)
              if (length(val) > obj.nParams)
                 error('Length of paramNames vector must be <= nparams');
              elseif (iscell(val) == false)
                 error('paramNames must be cell array');

        else
                   obj.paramNames = val;
                end
            end

            function obj = set.paramConstr(obj,val)
                if (length(val) > obj.nParams)
                    error('Length of poramConstr vector must be <= nParams');
                elseif (iscell(val) == false)
                    error('paramConstr must be cell array');
                else
                    for i = 1:length(val)
                        thisVal = val{i};
                        if isempty(thisVal)
                            val{i} = [0  0];
                        elseif (~isnumeric(thisVal) || (size(thisVal,1)~=1 || size(thisVal,2)~=2) || isinteger(val))
                            error('value %d in assignment to paramConstr must be 1x2 double',i);
                        end
                    end
                end

                obj.paramConstr = val;
            end
            %End parameters block
        end

        methods (Access = private)

            function obj = extendNParams(obj,val)
               currentLength = length(obj.params);
               new = zeros(1,(val-currentLength));
               new = [obj.params,new];
               obj.params = new;
            end

            function obj = contractNParams(obj,val)
               obj.params = obj.params(1:val);
            end

            function obj = extendNParamNames(obj,val)
               currentLength = length(obj.paramNames);
               new = cell([1,(val-currentLength)]);
               new = horzcat([obj.paramNames],new);
               obj.paramNames = new;
            end

            function obj = contractNParamNames(obj,val)
               obj.params = obj.params{1:val};
            end

            function obj = extendNParamConstr(obj,val)
               currentLength = length(obj.paramConstr);
               new = cell([1,(val-currentLength)]);
               new(:) = {[0 0]};
               new = horzcat([obj.paramConstr],new);
               obj.paramConstr = new;
            end

            function obj = contractNParamConstr(obj,val)
                obj.paramConstr = obj.paramConstr(1:val);
            end

        end

     end

This hows the behaviur I want. So I can make an 'empty' class....

>> a = problemDef

a = 

    problemDef with properties:

          nParams: []
           params: []
       paramNames: []
      paramConstr: []

>>

...then everything is controlled by the 'nParams' property. So, when I set nParams, the size of all the other arrays is set by this....

>> a.nParams = 5

a = 

    problemDef with properties:

          nParams: 5
           params: [0 0 0 0 0]
       paramNames: {[]  []  []  []  []}
      paramConstr: {[0 0]  [0 0]  [0 0]  [0 0]  [0 0]}

>>

I can then set the values of the arrays as I like with normal Matlab indexing....

>> a.paramConstr{1} = [-inf inf]; a.params(3:end) = 10; a.paramNames{1} = 'HelloWorld'; a.paramConstr{1} = [-inf inf]

a = 

    problemDef with properties:

          nParams: 5
           params: [0 0 10 10 10]
       paramNames: {'HelloWorld'  []  []  []  []}
      paramConstr: {[-Inf Inf]  [0 0]  [0 0]  [0 0]  [0 0]}

>>

This is exactly the behaviour I want, and seems to work. However, in the 'set.nParams' block, a lot of the calls are underlined with the warning 'A set method for a non-dependent property should not access anothe property..'.

I'm not used to working with classes, so I'm not totally sure what this means (have checked the documentation but still not sure). Can someone suggest how I should write the class to get the behaviour I have here, without triggering this warning? (Or even is this warning something I can ignore in this case??)

Cheers,

Arwel