File: import9.f90

package info (click to toggle)
gcc-arm-none-eabi 15%3A14.2.rel1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,099,328 kB
  • sloc: cpp: 3,627,108; ansic: 2,571,498; ada: 834,230; f90: 235,082; makefile: 79,231; asm: 74,984; xml: 51,692; exp: 39,736; sh: 33,298; objc: 15,629; python: 15,069; fortran: 14,429; pascal: 7,003; awk: 5,070; perl: 3,106; ml: 285; lisp: 253; lex: 204; haskell: 135
file content (30 lines) | stat: -rw-r--r-- 706 bytes parent folder | download | duplicates (6) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
 
! { dg-do compile }
!
! PR fortran/48821
!
! Contributed by Daniel Carrera
!

contains
     pure subroutine rk4_vec(t, Y, dY, h)
         real, intent(inout) :: t, Y(:)
         real, intent(in) :: h
         real, dimension(size(Y)) :: k1, k2, k3, k4

         interface
             pure function dY(t0, y0)
                 import :: Y
                 real, intent(in) :: t0, y0(size(Y))
                 real :: dY(size(y0))
             end function
         end interface

         k1 = dY(t, Y)
         k2 = dY(t + h/2, Y + k1*h/2)
         k3 = dY(t + h/2, Y + k2*h/2)
         k4 = dY(t + h  , Y + k3*h)

         Y = Y + (k1 + 2*k2 + 2*k3 + k4) * h/6
         t = t + h
     end subroutine
end