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How to call Array-valued Functions in fortran?


How to call Array-valued Functions in fortran?

By : Samuel
Date : November 22 2020, 10:48 AM
I wish this help you You need to make the properties of the function known to the caller. The easiest way is to put it into a module and 'use' that module. In your examples, in your main program you are declaring an array 'F18', which is not the function.
code :
module mystuff

contains

function F18(A,n)
implicit none
    integer n
    real A(:)                   ! An assumed shape array
    real F18(size(A,1))         ! The function result itself is
                               ! the second dimension of A.
    F18 =A                 !
end function F18


end module mystuff

program test
    use mystuff
    implicit none
    real a(3)
    a = (/1,2,3/)
    print *, F18(a,3)
end program test


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Fortran: pointer to various array-valued functions

Fortran: pointer to various array-valued functions


By : Dipen Patel
Date : March 29 2020, 07:55 AM
help you fix your problem For a pointer to a function that returns an array, you want to have an interface to describe a pointer to a function that returns an array.
Here is an example of how to setup function pointers that might set you in the right direction: How to alias a function name in Fortran
code :
module ExampleFuncs

   implicit none

contains

function f1 (x)
  real, dimension (:), allocatable :: f1
  real, intent (in) :: x

  allocate (f1 (1:2))
  f1 (1) = 2.0 * x
  f1 (2) = -2.0 * x

  return
end function f1


function f2 (x)
   real, dimension (:), allocatable :: f2
   real, intent (in) :: x

   allocate  (f2 (1:3))
   f2 (1) = x
   f2 (2) = x**2
   f2 (3) = x**3

   return
end function f2

end module ExampleFuncs


program test_func_ptrs

   use ExampleFuncs
   implicit none

   abstract interface
      function func (z)
         real, dimension (:), allocatable :: func
         real, intent (in) :: z
      end function func
   end interface

   procedure (func), pointer :: f_ptr

   real :: input

   do

      write (*, '( // "Input test value: ")', advance="no" )
      read (*, *) input

      if ( input < 0.0 ) then
         f_ptr => f1
      else
         f_ptr => f2
      end if

      write (*, '( "evaluate function: ", *(ES14.4) )' )  f_ptr (input)

   end do


end program test_func_ptrs
Call array functions in Fortran

Call array functions in Fortran


By : Akhil Sikri
Date : March 29 2020, 07:55 AM
I wish did fix the issue. As far as I know, it is not possible without at least some declaration of a temporary array. You could try pointers to save some memory, though:
code :
!...
REAL, POINTER :: x_output, y_output
REAL, DIMENSION(0:1),TARGET :: a_dummy

x_input = 1.0
y_input = 2.0

a_dummy = Test_Array(x_input, y_input)

x_output => a_dummy(0)
y_output => a_dummy(1) 
!... 
!...
a_dummy = Test_Array(1.0, 2.0)
!...
Cross apply on both scalar-valued and table-valued functions

Cross apply on both scalar-valued and table-valued functions


By : vikey
Date : March 29 2020, 07:55 AM
this one helps. Why would you put scalar function in cross apply just use it in Select and use the table valued function alone in cross apply. Something like this
code :
SELECT t.ID,
       t.[Date],
       t.[Text],
       t.Points,
       dbo.Fncalcdistancekm(t.Latitude, @Latitude, t.Longtitude, @Longtitude) AS Distance,
       dbo.Getthreadcommentcount(t.ID)                                        AS [Messages],
       t.Color,
       dbo.Isownthread(t.ID, @UserID)                                         AS IsOwnThread,
       func.HasVoted,
       func.IsUpvote
FROM   dbo.Threads AS t
       CROSS APPLY dbo.Hasvotedisupvote(t.ID, @UserID) func
WHERE  t.CountryCode = @CountryCode
       AND dbo.Fncalcdistancekm(t.Latitude, @Latitude, t.Longtitude, @Longtitude) < @DistanceInKm
ORDER  BY t.Date DESC
OFFSET @Offset ROWS FETCH NEXT 20 ROWS ONLY 
SELECT t.ID,
       t.[Date],
       t.[Text],
       t.Points,
       cs.Distance,
       dbo.Getthreadcommentcount(t.ID)                                        AS [Messages],
       t.Color,
       dbo.Isownthread(t.ID, @UserID)                                         AS IsOwnThread,
       func.HasVoted,
       func.IsUpvote
FROM   dbo.Threads AS t
       CROSS APPLY dbo.Hasvotedisupvote(t.ID, @UserID) func
       cross apply (select dbo.Fncalcdistancekm(t.Latitude, @Latitude, t.Longtitude, @Longtitude))cs (Distance)
WHERE  t.CountryCode = @CountryCode
       AND cs.Distance < @DistanceInKm
ORDER  BY t.Date DESC
OFFSET @Offset ROWS FETCH NEXT 20 ROWS ONLY 
Type error when compiling a real valued array. Fortran error #7113

Type error when compiling a real valued array. Fortran error #7113


By : mangooo
Date : March 29 2020, 07:55 AM
wish helps you From some experiments, it seems that the behavior of reshape (or more precisely, a temporary array created inside the reshape function) observed above is vendor extensions for some particular version of compiler (maybe ifort14?). Please compare the results for B and C below, which depend on the compilers and versions used.
code :
! [compilers used]
! ifort 14 and 16 (both with an option '-standard-semantics')
! gfortran 4.8 and 7.1
! Oracle studio fortran 12.5
! PGI Fortran Community Edition 2017.4

program main
    implicit none
    real :: A( 3 ), B( 3 ), C( 3 )

    !-------------------------
    ! RHS = uniform integer array

    A = [ 1, 2, 3 ]    !! an integer temporary array is created for RHS and assigned to A (with integer -> real conversion)
    print *, [ 1, 2, 3 ]
    print *, "A = ", A

    ! gfortran: PASS
    ! ifort16 : PASS
    ! ifort14 : PASS
    ! oracle  : PASS
    ! pgi     : PASS

    !-------------------------
    ! RHS = [ real, integer, integer ]

    B = [ 1.1, 2, 3 ]
    print *, [ 1.1, 2, 3 ]
    print *, "B = ", B

    ! gfortran: Error: Element in REAL(4) array constructor at (1) is INTEGER(4)
    ! ifort16 : Error: If type specification is omitted, each element
    !                  in an array-constructor must have the same type
    !                  and kind type parameters. 
    ! ifort14 : PASS (*)
    ! oracle  : Error: All ac-value expressions in an array constructor
    !                  must have the same type and type parameters.
    ! pgi     : PASS (*)

    !-------------------------
    ! RHS = [ integer, real, integer ]

    C = [ 1, 2.2, 3 ]
    print *, [ 1, 2.2, 3 ]
    print *, "C = ", C

    ! gfortran: Error: Element in INTEGER(4) array constructor at (1) is REAL(4)
    ! ifort16 : Error: (same message as for B)
    ! ifort14 : Error: Each ac-value expression in an array-constructor
    !                  must have the same type and type parameters.
    ! oracle  : Error: (same message as for B)
    ! pgi     : PASS (**)

    ! The error message from ifort-14 is the same as that shown in the question.

end
!-------------------------
gfortran, ifort-16, oracle

      1         2         3
 A =  1.000000  2.000000  3.000000

 ! B and C => error

!-------------------------
ifort-14

      1         2         3
 A =  1.000000  2.000000  3.000000

      1.100000  2.000000  3.000000   (*)
 B =  1.100000  2.000000  3.000000   (*)

 ! C => error

!-------------------------
PGI
      1         2         3
 A =  1.000000  2.000000  3.000000    

      1.100000  2.000000  3.000000    
 B =  1.100000  2.000000  3.000000    

      1         2         3           (**)
 C =  1.000000  2.000000  3.000000    (**)
B = [ real :: 1.1, 2, 3 ]
print *, [ real :: 1.1, 2, 3 ]
print *, "B = ", B

C = [ real :: 1, 2.2, 3 ]
print *, [ real :: 1, 2.2, 3 ]
print *, "C = ", C
      1.100000  2.000000  3.000000
 B =  1.100000  2.000000  3.000000

      1.000000  2.200000  3.000000
 C =  1.000000  2.200000  3.000000
f2py array valued functions

f2py array valued functions


By : Ziggy
Date : March 29 2020, 07:55 AM
Any of those help The mechanism of f2py turns Fortran subroutines into python functions. It doesn't understand how to turn a Fortran function into a python function. I have found that I need to wrap all Fortran functions with a subroutine, or even better, rewrite them as subroutines.
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