'Undefined Function or Variable' Error when the variable is perfectly defined!!!!!

Question

Homayoon 2018-1-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/376680-undefined-function-or-variable-error-when-the-variable-is-perfectly-defined

编辑： Homayoon 2018-1-12

Dear MATLAB users,

My code is rather simple and everything is properly defined. Yet I keep receiving error. Can anybody please help me to figure this out? I have spent a lot to see what might cause the problem but could not find any problem.

Here is my code:

Step = [95034, 4, 3, 2, 1, 27, 28, 93464, 93464
            98799, 12, 11, 10, 9, 30, 29, 95034, 83288
            849220, 24, 23, 26, 25, 35, 36, 841358, 841358
            849380, 16, 15, 14, 12, 34, 33, 841358, 841358
            881626, 5, 6, 7, 8, 39, 40, 880172, 866342
            1070520, 28, 27, 3, 4, 14, 24, 1068914, 1068914];
Config=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 25 26 23 24 33 34 35 36 37 38 39 40 21 22 31 32 30 29 27 28
       5 6 7 8 13 14 15 16 17 18 19 20 21 22 31 32 9 10 11 12 25 26 23 24 33 34 35 36 37 38 39 40 1 27 28 4 3 2 30 29
       5 6 7 8 4 3 2 13 12 14 15 16 17 18 19 20 25 26 23 24 21 22 31 32 37 38 39 40 9 30 29 1 27 28 10 11 34 33 35 36
       5 6 7 8 4 3 2 13 12 14 15 16 17 18 19 20 25 26 23 24 21 22 31 32 37 38 39 40 9 30 29 1 27 28 10 11 34 33 35 36
       17 18 19 20 5 6 7 8 4 3 2 13 21 22 15 16 12 34 33 25 35 36 24 31 32 9 30 29 1 27 28 37 38 14 23 26 10 11 39 40
       28 27 3 4 9 30 29 20 35 36 25 34 33 17 38 37 1 2 13 16 15 21 5 6 12 8 39 40 10 11 22 7 23 26 18 19 14 24 31 32];
Config2=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 25 26 23 24 33 34 35 36 37 38 39 40 21 22 31 32 30 29 27 28
       5 6 7 8 13 14 15 16 17 18 19 20 21 22 31 32 9 10 11 12 25 26 23 24 33 34 35 36 37 38 39 40 4 3 2 28 27 1 30 29
       5 6 7 8 4 3 2 13 12 14 15 16 17 18 19 20 25 26 23 24 21 22 31 32 37 38 39 40 9 30 29 1 27 28 10 11 34 33 35 36
       5 6 7 8 4 3 2 13 12 14 15 16 17 18 19 20 21 22 31 32 37 38 39 40 9 30 29 1 27 28 25 35 36 24 23 26 10 11 34 33
       37 38 14 20 5 6 7 8 4 3 2 13 21 22 15 16 12 34 33 25 35 36 24 31 32 9 30 29 1 27 28 17 18 19 23 26 10 11 39 40
       28 27 3 4 9 30 29 20 35 36 25 34 33 17 38 37 1 2 13 16 15 21 5 6 12 8 39 40 10 11 22 7 23 26 18 19 14 24 31 32];
M =[9 0 0 0 2 0
  8 1 1 0 1 0
  7 2 0 1 2 0
  7 2 0 1 2 0
  4 5 1 2 1 0
  1 8 0 4 2 0];
MMM=[9 0 0 0 2 0 95034 95034
    9 0 0 0 2 0 97883 98032
    7 2 0 1 2 0 849220 849220
    6 3 1 1 1 0 849220 849380
    4 5 1 2 1 0 881351 881626
    1 8 0 4 2 0 1068914 1068914];
V = load('xav');
for r = 1:size(Step,1)
Test_Verify_Config = Config(r,:);
size (Test_Verify_Config' , 1)
size(((unique(Test_Verify_Config (Test_Verify_Config  ~= 0),'stable')).'),1)
ks = Step(r, 1) - 0;
kconfig2 = MMM(r,7);
kconfig3 = MMM(r,8);
klast = Step(r, 8) - 0;
ntot = sum(M(r,:));
Rest of the code...

I keep seeing this error:

      Undefined function or variable 'MMM'.
      Error in code (line )
      kconfig2 = MMM(r,7);

What causes this? I have no idea....Thanks so much in advance.

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Homayoon 2018-1-12

Thank you all for helpful comments. I am not still very sure what causes this but the problem is gone. What I did was close the terminal and re-run the MATLAB. The code worked with no error.

I am using MATLAB installed on a computational cluster, I am not sure if something interrupted or kicked in once the code was running yesterday. All I know at the moment is that the code works just fine with no problem.:-)