Manual Reference Pages - rank (3fortran)
NAME
RANK(3) - [ARRAY:INQUIRY] Rank of a data object
SYNOPSIS
result = rank(a)
integer function rank(a)type(TYPE(kind=**)),intent(in) :: a(..)
CHARACTERISTICS
o A can be of any type TYPE and rank. o a kind designated as ** may be any supported kind for the type
DESCRIPTION
RANK(3) returns the rank of a scalar or array data object.
The rank of an array is the number of dimensions it has (zero for a scalar).
OPTIONS
o A is the data object to query the dimensionality of. The rank returned may be from 0 to 16. The argument A may be any data object type, including an assumed-rank array.
RESULT
For arrays, their rank is returned; for scalars zero is returned.
EXAMPLES
Sample program:
program demo_rank implicit noneResults:! a bunch of data objects to query integer :: a real, allocatable :: b(:,:) real, pointer :: c(:) complex :: d
! make up a type type mytype integer :: int real :: float character :: char end type mytype type(mytype) :: any_thing(1,2,3,4,5)
! basics print *, ’rank of scalar a=’,rank(a) ! you can query this array even though it is not allocated print *, ’rank of matrix b=’,rank(b) print *, ’rank of vector pointer c=’,rank(c) print *, ’rank of complex scalar d=’,rank(d)
! you can query any type, not just intrinsics print *, ’rank of any arbitrary type=’,rank(any_thing)
! an assumed-rank object may be queried call query_int(10) call query_int([20,30]) call query_int( reshape([40,50,60,70],[2,2]) )
! you can even query an unlimited polymorphic entity call query_anything(10.0) call query_anything([.true.,.false.]) call query_anything( reshape([40.0,50.0,60.0,70.0],[2,2]) )
contains
subroutine query_int(data_object) ! It is hard to do much with something dimensioned ! name(..) if not calling C except inside of a ! SELECT_RANK construct but one thing you can ! do is call the inquiry functions ... integer,intent(in) :: data_object(..) character(len=*),parameter :: all=’(*(g0,1x))’
if(rank(data_object).eq.0)then print all,& & ’passed a scalar to an assumed rank, & & rank=’,rank(data_object) else print all,& & ’passed an array to an assumed rank, & & rank=’,rank(data_object) endif
end subroutine query_int
subroutine query_anything(data_object) class(*),intent(in) ::data_object(..) character(len=*),parameter :: all=’(*(g0,1x))’ if(rank(data_object).eq.0)then print all,& &’passed a scalar to an unlimited polymorphic rank=’, & & rank(data_object) else print all,& & ’passed an array to an unlimited polymorphic, rank=’, & & rank(data_object) endif end subroutine query_anything
end program demo_rank
rank of scalar a= 0 rank of matrix b= 2 rank of vector pointer c= 1 rank of complex scalar d= 0 rank of any arbitrary type= 5
passed a scalar to an assumed rank, rank= 0 passed an array to an assumed rank, rank= 1 passed an array to an assumed rank, rank= 2 passed a scalar to an unlimited polymorphic rank= 0 passed an array to an unlimited polymorphic, rank= 1 passed an array to an unlimited polymorphic, rank= 2
STANDARD
SEE ALSO
Array inquiry:
State Inquiry:
o SIZE(3) - Determine the size of an array o RANK(3) - Rank of a data object o SHAPE(3) - Determine the shape of an array o UBOUND(3) - Upper dimension bounds of an array o LBOUND(3) - Lower dimension bounds of an array Kind Inquiry:
o ALLOCATED(3) - Status of an allocatable entity o IS_CONTIGUOUS(3) - Test if object is contiguous Bit Inquiry:
o KIND(3) - Kind of an entity fortran-lang intrinsic descriptions (license: MIT) @urbanjost
o STORAGE_SIZE(3) - Storage size in bits o BIT_SIZE(3) - Bit size inquiry function o BTEST(3) - Tests a bit of an integer value.
| Nemo Release 3.1 | rank (3fortran) | April 28, 2024 |
