MATLAB: How do i remove this error? Function definitions are not permitted in this context.

matlab cvst

xyRange=[1,5];      %// Starting xy range of particles
numP=3;             %// Number of particles generated each day
vx=0.6; vy=0.4;     %// x and y velocity
X=[]; Y=[];         %// Vectors start out empty
for day=1:10
   %// Generate 3 particles and add to end of vectors X and Y
   X=[X;randi(xyRange,numP,1)]; 
   Y=[Y;randi(xyRange,numP,1)]; 
     %// Move all the particles
     X=X+vx;
     Y=Y+vy;
     end
  plot(X,Y,'kd');
  grid on ;
  axis([1,50,1,50]); 
  function [box] = coord(X,Y)
  for j = floor(X/5)+1;
      k = floor(Y/5);
      box = k*10+j;
  end
  end

Best Answer

You can write it w/o a function, and you don't need the inner for j= ... loop:
for day=1:10
   %// Generate 3 particles and add to end of vectors X and Y
   X=[X;randi(xyRange,numP,1)]; 
   Y=[Y;randi(xyRange,numP,1)]; 
       %// Move all the particles
       X=X+vx;
       Y=Y+vy;
       end
    plot(X,Y,'kd');
    grid on ;
    axis([1,50,1,50]); 
    j = floor(X/5)+1;
    k = floor(Y/5);
    box = k*10+j;
end
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