質問編集履歴
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一部だけだったのをソースコード全体にしました。
test
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File without changes
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test
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@@ -18,15 +18,245 @@
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###
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r
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program main
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implicit none
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integer,parameter :: n=14610
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integer :: i,day,k
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real*8 :: h,a(n),xj(n),yj(n),zj(n),x1,x2,x3,x4,x5,x6,
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& f1,f2,f3,f4,f5,f6,ka1,ka2,ka3,ka4,ka5,ka6,kb1,kb2,kb3,
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& kb4,kb5,kb6,kc1,kc2,kc3,kc4,kc5,kc6,kd1,kd2,kd3,kd4,
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& kd5,kd6,gs,gj,xr,xrj,xmj
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open(10,file='z_jupitar-2.txt')
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do i=1,n
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read(10,*) a(i),xj(i),yj(i),zj(i)
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end do
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close(10)
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! 初期条件
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x1=3.64d-7
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x2=0.0d0
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x3=0.0d0
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x4=0.0d0
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x5=8.0d0
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x6=0.0d0
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h=20.0d0
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write(*,*) 0,x1,x2,x3,xj(1),yj(1),zj(1)
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! 彗星の位置推算 Runge-Kutta法
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do k=1,n-3,2
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i=k
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day=(i+1)*10
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ka1=h*f1(x4)
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ka2=h*f2(x5)
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ka3=h*f3(x6)
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ka4=h*f4(x1,x2,x3)
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ka5=h*f5(x1,x2,x3)
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ka6=h*f6(x1,x2,x3)
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! write(*,*) ka1,ka2,ka3,ka4,ka5,ka6
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i=i+1
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kb1=h*f1(x4+ka4/2.0d0)
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kb2=h*f2(x5+ka5/2.0d0)
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kb3=h*f3(x6+ka6/2.0d0)
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kb4=h*f4(x1+ka1/2.0d0,x2+ka2/2.0d0,x3+ka3/2.0d0)
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kb5=h*f5(x1+ka1/2.0d0,x2+ka2/2.0d0,x3+ka3/2.0d0)
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kb6=h*f6(x1+ka1/2.0d0,x2+ka2/2.0d0,x3+ka3/2.0d0)
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! write(*,*) kb1,kb2,kb3,kb4,kb5,kb6
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kc1=h*f1(x4+kb4/2.0d0)
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kc2=h*f2(x5+kb5/2.0d0)
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kc3=h*f3(x6+kb6/2.0d0)
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kc4=h*f4(x1+kb1/2.0d0,x2+kb2/2.0d0,x3+kb3/2.0d0)
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kc5=h*f5(x1+kb1/2.0d0,x2+kb2/2.0d0,x3+kb3/2.0d0)
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kc6=h*f6(x1+kb1/2.0d0,x2+kb2/2.0d0,x3+kb3/2.0d0)
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! write(*,*) kc1,kc2,kc3,kc4,kc5,kc6
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i=i+1
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! write(*,*) i
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kd1=h*f1(x4+kc4)
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kd2=h*f2(x5+kc5)
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kd3=h*f3(x6+kc6)
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kd4=h*f4(x1+kc1,x2+kc2,x3+kc3)
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kd5=h*f5(x1+kc1,x2+kc2,x3+kc3)
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kd6=h*f6(x1+kc1,x2+kc2,x3+kc3)
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! write(*,*) kd1,kd2,kd3,kd4,kd5,kd6
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x1=x1+(ka1+kd1)/6.0d0+(kb1+kc1)/3.0d0
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x2=x2+(ka2+kd2)/6.0d0+(kb2+kc2)/3.0d0
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x3=x3+(ka3+kd3)/6.0d0+(kb3+kc3)/3.0d0
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x4=x4+(ka4+kd4)/6.0d0+(kb4+kc4)/3.0d0
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x5=x5+(ka5+kd5)/6.0d0+(kb5+kc5)/3.0d0
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x6=x6+(ka6+kd6)/6.0d0+(kb6+kc6)/3.0d0
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write(*,*) day,x1,x2,x3,x4,x5,x6
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end do
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stop
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end program main
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! 微分方程式
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real*8 function f1(x4)
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implicit none
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real*8 :: x4
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f1=x4
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return
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end function f1
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real*8 function f2(x5)
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implicit none
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real*8 :: x5
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f2=x5
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return
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end function f2
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real*8 function f3(x6)
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implicit none
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real*8 :: x6
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f3=x6
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return
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end function f3
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real*8 function f4(x1,x2,x3)
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implicit none
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integer,parameter :: n=14610
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integer :: i
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real*8 :: x1,x2,x3,x
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real*8 :: x1,x2,x3,xj(n),yj(n),zj(n),
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& gs,gj,xr,xrj,xmj
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@@ -58,7 +288,7 @@
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real*8 function f5(
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real*8 function f5(x1,x2,x3)
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implicit none
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integer :: i
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real*8 :: x1,x2,x3,x
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real*8 :: x1,x2,x3,xj(n),yj(n),zj(n),
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& gs,gj,xr,xrj,xmj
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real*8 function f6(
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real*8 function f6(x1,x2,x3)
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implicit none
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integer :: i
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real*8 :: x1,x2,x3,x
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real*8 :: x1,x2,x3,xj(n),yj(n),zj(n),
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& gs,gj,xr,xrj,xmj
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@@ -142,6 +372,8 @@
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```
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