DOUBLEM

Datafile mapping for conversion to double

   B = DOUBLEM(A)
   B = A*DOUBLEM

For datasets B = A, but the data inside A is converted to double.  For datafiles B = A, but the command makes sure that the data in B is  first converted to double when B is converted to a dataset.  In all other cases A itself is converted to double.  This is useful to convert INT8 and other formats inside a dataset.