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

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.

[Stephen23]

Did you edit the error message? This is strange:

Error in code (line )

Are all of these commands on one script?

[Homayoon]

Yes Stephen. All of these commands are on one script. I just accidentally deleted the line number. It was a typo.

[Rik]

And where does the for-loop end? Maybe your variable is cleared, so on the second round it doesn't exist anymore.

[Adam]

Use the Stop/Pause on Errors option from the Breakpoints menu to see which iteration of the for loop it fails in.

But as with many questions here, it is almost certainly in the code you chose to miss out as not being relevant, where the problem is, as Rik says.

[Stephen23]

What is contained in:

Rest of the code...

? If the workspace is cleared (intentionally or otherwise) then this would cause that error.

[Homayoon]

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.:-)

[Adam]

Uee functions instead of scripts and these kind of things will happen a lot less, especially if you remove any spurious

clear all

type instructions from your code too.

Answer 1

[ES]

Step_Atoms is the only suspect. What does the function contain?