Writing variables as a matrix in the for loop

Hello

I wrote a script which computes second moment of a function within a circular area. I chose the points within the circle using a loop, however I could not write the poins I chose to a matrix. I want to write the m(1,1) and m(2,1) and g array to a matrix with k rows and 3 columns. M(m(1,1),m(2,1),g') size (M)= (k,3)

here is my code:

    % % % %2D numerical moment calculation  
  fun = @(x,y)(1-x.^2-y.^2);

R=1; %radius
[r,phi]=meshgrid(linspace(-1,1,100),linspace(2*pi/90,2*pi,90));
X=r.*cos(phi);
Y=r.*sin(phi);
% figure (1)
% plot(X(:),Y(:),'.','markersize', 0.5);
% title('Grid points inside the given circle')
% xlabel('x');ylabel('y')
% % % 
figure (2)
subplot(1,2,1)
surf(X,Y,fun(X,Y));
title('Given Function(1-x^2-y^2)')
xlabel('x');ylabel('y');zlabel('f')
%Compute the grid points inside the circle r=1
xx=[-1:0.1:1];
yy=[-1:0.1:1];
X=sort(repmat(xx,[1 length(xx)])');
Y=(repmat(yy,[1 length(yy)])');
zloc = 1-X.^2 - Y.^2;
A=[X Y zloc];
condition=A(:,3)<0;
A(condition,:)=[];
n=length(A);
a=A(:,1); b=A(:,2);
figure(1)
plot(a,b,'.')
%area of domain
area=(pi*R^2);
%%%%%%%%%%%
%grid search
cc=[0;0];
d=1; 
max=cc + d;
min=cc - d;
dx=0.1; %unit distance
n=ceil((max-min)/dx) + 1;
% nn=length(A);
f02d=0;
f1x2d=0;
f1y2d=0;
f2x2d=0;
f2y2d=0;
f2xy2d=0;
k=0;
for i1=1:n(1)
  m(1,1)=min(1)+dx*((i1)-1);
  for i2=1:n(2)
    m(2,1)=min(2)+dx*((i2)-1);
    if sqrt(1-m(1,1)^2-m(2,1)^2) > 0
      x=m(1,1) ;
      y=m(2,1);
      k=k+1;
      f02d=f02d+(fun(x,y));
      f1x2d=f1x2d+x*(fun(x,y));
      f1y2d=f1y2d+y*(fun(x,y));
      f2x2d=f2x2d+x^2*(fun(x,y));
      f2y2d=f2y2d+y^2*(fun(x,y));
      f2xy2d=f2xy2d+x*y*(fun(x,y));
      % for i=1:k
      %     g(i)=exp((-0.5)*(m'*inv(cov)*m))*(1/(det(cov)*(2*pi)));
      %     M=zeros(k,3);
      % end
    end
  end
end
% nn=100;
nn=k;
ff0=area*f02d/nn;
ff1x=area*f1x2d/(nn*ff0);
ff1y=area*f1y2d/(nn*ff0);
ff2x=area*f2x2d/(nn);
ff2y=area*f2y2d/(nn);
ff2xy=area*f2xy2d/(nn);
cov=[ff2x ff2xy;ff2xy ff2y];

I appreciate any help.

Thank you.