my for loops do not work

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shiva 2014-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/158477-my-for-loops-do-not-work

评论： Star Strider 2014-10-13

采纳的回答： Star Strider

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hello, my for loops do not seem to work.I appreciate if anyone could help me with that.

clear all;
m=500;
n=50;
G=zeros(m,n);
G(250,1)=1;
S(1,1)=1;
for i=2:1:300
sol=roots([1 -S(i-1,1) -1]);
 S(i,1)=sol(sol>=0);
end
S=10*(S);
y=ceil(S);
y(1,1)=1;
G(250,1)=1;
G(250+y(1,1),1)=1;
for t=1:1:50
    for k=50:1:1
        if y(t+50-k,1)<=250
           for j=1:1:y(t+50-k,1)
              G(250+j,k)=1;
              G(250-j,k)=1;
           end
      end
  end
end

采纳的回答

Star Strider 2014-10-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/158477-my-for-loops-do-not-work#answer_155017

What does ‘do not seem to work’ mean? Your code runs without errors.

What do you want your for loops to do?

hello, thanks for your message. let me try to clarify my issue. actually I'm running this code to get some specific result and at the end I do not get that and that's why I think that my for loops do not work. in the beginning I have a zero matrix. then as time increases from 1 to 50, the elements of matrix G changes to one in this way:at t=1 the G(250+y(1,1),50) and G(250-y(1,1),50) and all the elements between them change to one, and G(250+y(2,1),49) and G(250-y(2,1),49)and all the elements between them change to one. and this keeps happening to the element of G(250-y(50,1),1) and (250-y(50,1),1)and all the elements between them. this must be operated by this loop: at t=1: for k=50:1:1 if y(t+50-k,1)<=250 for j=1:1:y(t+50-k,1) G(250+j,k)=1; G(250-j,k)=1; end end end and then for the second time step t=2 we have : the G(250+y(2,1),50) and G(250-y(2,1),50) and all the elements between them change to one + and G(250+y(3,1),49) and G(250-y(3,1),49)and all the elements between them . . . and G(250+y(51,1),1) and G(250-y(2,1),49)and all the elements between them and these changes end once t=50. eventually I'm expecting the matrix G with elements 1 and that's what we do not obtain, we have the same zero matrixG.

I hope I could convey my message clearly.

thanks in advance