子程序的某个形参是函数

lxxx

有一段程序：

[Fortran] 纯文本查看 复制代码

program ode
use rksuite_90
implicit none
……
external::f
dimension(2)::f
……
call range_integrate_r1(comm,f,t_want,t_got,y_got,yderiv_got,flag)
stop
end program ode

function f(t,y)
use rksuite_90
implicit none
real(kind=wp)::t
real(kind=wp)::y(2)
real(kind=wp)::f(2)     !声名返回值类型
f(1)=y(2)
f(2)=-y(1)
end function

module如下。

[Fortran] 纯文本查看 复制代码

module rksuite_90
……
recursive subroutine range_integrate_r1(comm,f,t_want,t_got,y_got,yderiv_got,flag)
interface 
      function f(t,y)
      use rksuite_90_prec, only:wp
      real(kind=wp), intent(in) :: t                                 !indep!
      real(kind=wp), dimension(:), intent(in) :: y                   !dep!
      real(kind=wp), dimension(size(y,1)) :: f                       !dep!
      
   end function f

end interface
……
comm%yp = f(comm%t,comm%y)
……
end module rksuite_90

range_integrate_r1中的形参f是个function，由于 f 在module中的定义是dimension形式的，见module代码，（size=2），
所以需要将 f 以external且以一个数组的形式传给range_integrate_r1，请问应怎么做？
f（t，y）中的形参数值是在其他子程序中给定的，见module代码（语句为comm%yp = f(comm%t,comm%y)），不能我自己定义
我用

[Fortran] 纯文本查看 复制代码

external::f
dimension(2)::f

在主程序定义以后，程序报错如图

lxxx

谢谢！没系统学过fortran，不知到interface还能这么用……真的谢谢啦

chiangtp

[Fortran] 纯文本查看 复制代码

module rksuite_90_prec
  implicit none
  integer, parameter :: wp=selected_real_kind(P=15)
end module rksuite_90_prec

module rksuite_90
  implicit none
contains
  recursive subroutine range_integrate_r1(comm,f,t_want,t_got,y_got,yderiv_got,flag)
    implicit none
    real :: comm, t_want, t_got, y_got, yderiv_got, flag
    interface
       function f(t,y)
          use rksuite_90_prec, only:wp
          implicit none
          real(kind=wp), intent(in) :: t
          real(kind=wp), dimension(:), intent(in) :: y
          real(kind=wp), dimension(size(y,1)) :: f
       end function f
    end interface
    !...
  end subroutine range_integrate_r1
end module rksuite_90

program ode
  use rksuite_90
  implicit none
  real :: comm, t_want, t_got, y_got, yderiv_got, flag
  interface
     function f(t,y)
       use rksuite_90_prec, only:wp
       implicit none
       real(kind=wp), intent(in) :: t
       real(kind=wp), dimension(:), intent(in) :: y
       real(kind=wp), dimension(size(y,1)) :: f
     end function f
  end interface

  call range_integrate_r1(comm,f,t_want,t_got,y_got,yderiv_got,flag)

end program ode

function f(t,y)
  use rksuite_90_prec, only:wp
  implicit none
  real(kind=wp), intent(in) :: t
  real(kind=wp), dimension(:), intent(in) :: y
  real(kind=wp), dimension(size(y,1)) :: f
  f(1) = y(2)
  f(2) =-y(1)
end function f