how do i remove this error? Function definitions are not permitted in this context.

Question

sneha kriplani 2015-6-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/225787-how-do-i-remove-this-error-function-definitions-are-not-permitted-in-this-context

评论： Adam 2015-6-29

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

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Answer 1

Thorsten 2015-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/225787-how-do-i-remove-this-error-function-definitions-are-not-permitted-in-this-context#answer_184428

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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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sneha kriplani 2015-6-29

hey thanks for ur answer, it helped me sorting out that problem but i was just wondering if u can help me ahead of it also. if u will run this code then it will plot number of particles now i want to count number of particles in each grid box will give u which particle is in which grid but how to add number of particles in each gridbox ??? Thanks in advance