program behavior due to editor issues

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Fred 2013-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/89223-program-behavior-due-to-editor-issues

评论： cr 2013-10-5

In the attached code adding the two line commands near the top changes the behavior of the program from how it behaved without the line commands. Then I comment out the line commands and the program behavior does not revert to the program without the line commands. I delete the line commands and the program does not revert to the original.

Very confusing.

I have noticed other strange behavior. My code wasn't working as expected. I removed a section of code that looked correct, just to try something. I reinserted the very same section and the program worked as expected. I performed these operations with control x and control v.

I hope I am doing something wrong.

%Molecule trajectory

clf

 xx=1:10;z=[1 0 0 0 0 0 0 0 1 0];stem(xx,z)
 axis ([0 10 0 2]);
 %line([1,4],[1,1])
 %line([6,9],[1,1])
 hold on
 x = 0; y = 0;
 plot(9.5,1.2, 'o')
 dx = .1; dy = .008; N = 200;
 xo = 8.5; yo = 1.5;
    for i = 1:N
     x(i) = xo - i*dx;
     y(i) = yo - i*dy;
     plot(x(i),y(i))
      if x(i)<=1
          plot(x(i),y(i),'o')
          %set(p,'Color','red','LineWidth',1)
          %line([xo,yo],[x(i),y(i)])
          %return
          break
      end
    end
    x1 = x(i)
    y1 = y(i)
    i = 0;
    for i = 1:N
     x(i) = x1 + i*dx;
     y(i) = y1 - i*dy;
     plot(x(i),y(i))
      if y(i)<=0
          plot(x(i),y(i),'o')
          %set(p,'Color','red','LineWidth',1)
          %line([xo,yo],[x(i),y(i)])
          %return
          break
      end
    end
     x1 = x(i)
    y1 = y(i)
    i = 0;
    for i = 1:N
     x(i) = x1 + i*dx;
     y(i) = y1 + i*dy;
     plot(x(i),y(i))
      if x(i)>=9
          plot(x(i),y(i),'o')
          %set(p,'Color','red','LineWidth',1)
          %line([xo,yo],[x(i),y(i)])
          %return
          break
      end
    end
     x1 = x(i)
    y1 = y(i)
    i = 0;
    for i = 1:N
     x(i) = x1 - i*dx;
     y(i) = y1 + i*dy;
     plot(x(i),y(i))
      if x(i) <= 1
          plot(x(i),y(i),'o')
          %set(p,'Color','red','LineWidth',1)
          %line([xo,yo],[x(i),y(i)])
          %return
          break
      end
    end
    x1 = x(i)
    y1 = y(i)
    i = 0;
    for i = 1:N
     x(i) = x1 + i*dx;
     y(i) = y1 + i*dy;
     plot(x(i),y(i))
      if x(i) >= 9.5
          plot(x(i),y(i),'o')
          %set(p,'Color','red','LineWidth',1)
          %line([xo,yo],[x(i),y(i)])
          %return
          break
      end
    end

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cr 2013-10-5

Unable to reproduce your issue. For me, "lines" just create two additional horizontal lines and dont change anything else either in the plot or x1,y1 in command window. Is this a script or a function? If a function make sure your function name and filename are the same to avoid confusing outputs. Create a fresh directory and use scripts if functions dont have any i/o.

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