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/GNU Fortran 7

9.225 RANK — Rank of a data object

Description:

RANK(A) returns the rank of a scalar or array data object.

Standard:

Technical Specification (TS) 29113

Class:

Inquiry function

Syntax:

RESULT = RANK(A)

Arguments:
A can be of any type
Return value:

The return value is of type INTEGER and of the default integer kind. For arrays, their rank is returned; for scalars zero is returned.

Example:
program test_rank
  integer :: a
  real, allocatable :: b(:,:)

  print *, rank(a), rank(b) ! Prints:  0  2
end program test_rank

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/RANK.html