Create objects in a loop

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anis oukil 2018-8-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/413558-create-objects-in-a-loop

评论： anis oukil 2018-8-4

Hello, i have a class with properties and methods, i want to calculate somtehing, which is a method in my class, by varying a property in my class. Is it possible to create a loop that creates as objects as the length of my property, and then use the method for every object created ?

I could do it manually but for i=10:1:5000, it takes a long long time...

Here are the parts of my code for this question the property i want to vary is "N", the function that calculates what i want is "integ_sigma"

classdef pot_flow_class
      properties
          U;
          H;
          N;
          Ng;
          r;
          th;
          sigma;
          %         thp;
          X;
          Y;
          nb_iso;
          interp;
      end
      methods
          function obj = pot_flow_class(valH,valN,valNg,valR,valU,val_nb_iso)
              obj.U = valU;
              obj.H = valH;
              obj.N = valN;
              obj.Ng = valNg;
              obj.r = valR;
              obj.nb_iso = val_nb_iso;
              obj.th=0:pi/(valN-1):pi;
              %             sigma pour le pb infini
              obj.sigma=sin(obj.th)/pi;
              obj.X=linspace(-10,10,valNg);
              obj.Y=linspace(-200,200,valNg);
          end
          function obj = calcul_source(obj)
              RC = obj.r*cos(obj.th);
              RS = obj.r*sin(obj.th);
              RC = RC(2:obj.N-1);
              RS = RS(2:obj.N-1);
              Mat_A = pi*eye(obj.N-2);
              for i=1:obj.N-2
                  for j=1:obj.N-2
                      Mat_A(i,j)= Mat_A(i,j)+...
                          pi/obj.N*...
                          (RC(i)*(RC(i)+RC(j)-2*obj.H)+RS(i)*(RS(i)-RS(j)))/((RC(i)+RC(j)-2*obj.H)^2+(RS(i)-RS(j))^2)...
                          -pi/obj.N*...
                          (RC(i)*(RC(i)+RC(j)-2*obj.H)+RS(i)*(RS(i)+RS(j)))/((RC(i)+RC(j)-2*obj.H)^2+(RS(i)+RS(j))^2);
                  end
              end         
              obj.sigma(2:obj.N-1)=linsolve(Mat_A,-RS');
          end
          function integ_sigma(obj)
              S = trapz(obj.th,obj.sigma.*obj.sigma);
              disp(S)
          end
end
end

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Matt J 2018-8-4

to create a loop that creates as objects as the length of my property, and then use the method for every object created ?

There is no object creation shown in integ_sigma, so it is not clear what you mean. If you want to create multiple objects, you should do that in the constructor.

anis oukil 2018-8-4

I want to create multiple objects of this class for N from 10 to 5000 , and call calcul_source then integ_sigma for each N.

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