Fortran Fortran 95 question about dimension error

AI Thread Summary
Error 542 indicates that variables J and I are being used incorrectly in the code, as they are not recognized as dummy arguments, accessible variables, COMMON variables, PARAMETERS, or part of a PURE FUNCTION. The context involves using I and J to reference temperature in a numerical solution for the heat diffusion equation, specifically employing the Crank-Nicolson method, which relies on previous and next temperature values based on spatial and temporal dimensions. Troubleshooting the program is challenging without a complete code listing to analyze the variable usage and context further.
loukoumas
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error 542, J appears in the dimension of a variable,yet is not a dummy argument,a variable available through USE or CONTAINS association,a COMMON variable,a PARAMETER,or a PURE FUNCTION
the same error about I
i am using i,j in order to point the temperature in length and time T(i,j)
it is a numerical solution for the heat diffusion equation that uses the previous and the next value according to length of temperature and the previous value of temperature according to time( Crank-Nicolson method)
 
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It's going to be hard to troubleshoot your program without a listing.
 

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