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─────Array Expressions──────────────────────────────────────────────────────
 
     The compiler permits operations on full arrays that would
     normally only work with single arguments (scalars). All
     operations that are permitted for scalars are permitted for
     arrays.
 
     When two or more array operands appear in an assignment statement
     or expression, they all must conform (have the same number of
     dimensions), and corresponding dimensions must be the same size
     and have the same upper and lower boundaries. Note that a scalar
     quantity conforms to any array.
 
     Adjustable and allocatable arrays cannot appear in array
     expressions.
 
     All intrinsic functions that take scalar arguments may also take
     array arguments. To pass array arguments to external functions
     that take scalar arguments, declare the external function in an
     INTERFACE TO statement. None of the function's formal arguments
     can be arrays.
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