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How to pass a non standard data type to a function
It looks like maybe a simple typo: You didn;t declare zdum. did you want dzum or zdum? A REAL or INTEGER or LOGICAL data type is required in this context it means you can only dimension the array with those types. -
Fortran MPI programming...
I suspect that stdin is closed by mpiexec on all ranks but rank 0. You have a read command that all ranks will execute.
