Reference to non-existent field

Can someone tell me what's wrong with my classdef? When I run cool_class.funk(x) it works fine. But for cool_class.Afunction, it returns reference to non-existent field. I'm new to object, and it doesn't really make sense.

classdef cool_class
    properties
        tdata=[];
        adata=[];
        ainterp=[];
        tinterp=0;
    end

      methods (Static)

          function y = funk(x)
              y=0.5*x.^2+4;

          end

          function output=Afunction(z)
              %load shortdata.txt
              %tdata= shortdata(:,1);
              %adata= shortdata(:,2);
              xq1=0:0.01:z;
              vq1=interpn(cool_class.tdata,cool_class.adata,xq1,'linear');
              output.ainterp=vq1(end);
          end 

      end

end

Answer 1

[Walter Roberson]

properties belong to objects of a class, not to the class itself.

See https://www.mathworks.com/help/matlab/matlab_oop/static-data.html for information on creating data that is shared by the class.

[Arbol]

Thank you for the info, I'm going to look into it! Class is the most confusing thing ever!