Mercurial > op > rk_sakamoti

annotate rkmain.f90 @ 1:954faa9f6837

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separate output from calcuration.
author "uncorrelated zombie" <uncorrelated@yahoo.co.jp>
date Sun, 21 Jul 2024 02:08:58 +0900
parents 5bd0f2a15d2a
children 206e90e91191
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
parents:
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1 program rkmain
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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2 use rungekutta !ルンゲクッタ解法をまとめたモジュール
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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3 implicit none
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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4 real(kind=dpkind),dimension(3) :: x !状態変数
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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5 type(rk) :: rktype !ルンゲクッタ法ソルバに関連する型
1
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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6 real(kind=dpkind),allocatable,dimension(:,:) :: r
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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7 real(kind=dpkind) :: max_t
0
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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8
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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9 !初期値の指定
1
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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10 x = [0.5e0,0.5e0,0.5e0]
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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11 max_t = 5e1
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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12 call calc(x, max_t, r)
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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13 print *, r;
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14
0
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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15 !========================================
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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16 contains
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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17 !微分方程式の右辺を定義
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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18 function rhside(self,time,wk)
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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19 class(rk),intent(inout) :: self !parameter
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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20 real(kind=dpkind) :: time
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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21 real(kind=dpkind),dimension(:) :: wk
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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22 real(kind=dpkind),dimension(size(wk)) :: rhside
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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23 real(kind=dpkind),parameter :: a=10e0,b=28e0,c=8e0/3e0
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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24 rhside(1)=a*(wk(2)-wk(1))
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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25 rhside(2)=b*wk(1)-wk(2)-wk(1)*wk(3)
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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26 rhside(3)=wk(1)*wk(2)-c*wk(3)
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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27 end function
1
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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28 !Rから呼び出すサブルーチン
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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29 subroutine calc(x, max_t, r)
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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30 implicit none
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31 real(kind=dpkind),dimension(3),intent(in) :: x
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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32 real(kind=dpkind),intent(in) :: max_t
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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33 real(kind=dpkind),allocatable,dimension(:,:),intent(out) :: r
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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34 real(kind=dpkind) :: zero = 0
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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35 integer i, max_i
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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36 !微分方程式の右辺を計算する関数、解法、時間刻みの指定
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
parents: 0
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37 call rktype%setup(rhside,"rk4",1d-5)
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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38 max_i = int(max_t / 0.01)
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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39 allocate(r(0:max_i, 4))
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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40 !時刻max_t秒まで、0.01秒毎に配列に記録。
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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41 !ただし、内部的には刻み幅1e-5秒としている。
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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42 r(0, :) = [zero, x] ! 開始点
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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43 do i = 1, max_i
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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44 call rktype%solver(rktype%time+1e-2,x) !積分実行
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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45 r(i, :) = [rktype%time, x]
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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46 end do
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"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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47 end subroutine
0
5bd0f2a15d2a import from https://qiita.com/sakamoti/items/de851e0d07aeef5be310
"uncorrelated zombie" <uncorrelated@yahoo.co.jp>
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48 end program
1
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49