FORTRAN - Error 112 Run-time Error

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SUMMARY

The discussion addresses a recurring Run-time Error 112 encountered in FORTRAN simulations of a lattice model, particularly during larger system runs. The error indicates a reference to an undefined variable, array element, or function result. Users are advised to ensure that all array elements are properly initialized and to double-check array sizes to prevent this issue. Initializing all variables at the beginning of the simulation is recommended to mitigate the occurrence of this error.

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Athos_F
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I have strange situation where a code that generaly seems to work fine at times gives a error message.

basically I run simulations on a lattice model, and have experience no problems for small system, but when I go to larger systems (meaning that the simulation takes aprox. 15 min) I sometimes get into problem. To average my results I run each simulation a given number of times, and it seems that in around 0.5 % of the time my largest model gives the following error.

Run-time Error
*** Error 112, Reference to undefined variable, array element or function result (/UNDEF).

The line it conects to the problem is well defined, and should not be the problem.

Anyone know way?
 
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This error indicates that you are trying to use elemnts of an array without assigning a value for them. Double check the array sizes .

Also I would recommend initializing all your variables (including arrays) at the begininig of your simulation.
 

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