Microsoft Word - 03-数値計算の基礎.docx

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1 δx f x 0 + δ x n=0 a n = f ( n) ( x 0 ) n δx n f x x=0 sin x = x x3 3 + x5 5 x x ( ) = a n δ x n ( ) = sin x ak = (-mod(k,2))**(k/2) / fact_k 10

2 11

3 I = f x dx a ΔS = f ( x)h I = f a h I = h b ( ) ( ) + f ( a + h) f ( a + ih) f ( b h) N 1 i=1 ΔS = 1 2 ( ) f a + ih f ( x) + f ( x + h) h I = 1 2 f a ( ) + 2 f ( a + h ) f ( a + ih ) f ( b h) + f ( b) h 12

4 積分法 地球惑星内部物理学演習 B 資料3 端以外の係数が2になっている まとめると I= N 1 1 f a + 2 f ( a + ih ) + f ( b ) h ( ) 2 (16) i =1 である 台形法は2次の打ち切り誤差を持つ め足し合わせる y y=f(x) 似 積分 f(x) a f(x+h) h b x てを2次以上の多項式で近似 2.3 シンプソン法 h N /2 近接するいくつかの区間を1まとめにして より高次の次数をもつ多項式で関数を近似 する方法である 精度は補間する関数の次数で決まる 例えば 区間[a,b]を偶数個nに 等分し 2つまとめにすると 3点を用いて2次多項式を当てはめることができる こ f (b ) h 2 f ( a + 2ih ) + のとき 小区間を2つ合わせた区間の面積は =1 ΔS = 1 f ( x ) + 4 f ( x + h ) + f ( x + 2h ) h 3 (17) である このとき 区間[a, b]全体では 1 I = [ f ( a ) + 4 f ( a + h ) + 2 f ( a + 2h ) f ( a + 2ih ) + 4 f ( a + {2i + 1} h ) f ( b 2h ) + 4 f ( b h ) + f ( b )]h (18) となる 係数が 1 4 2 4 2 2 4 1となっている 2は小区間を2つ にまとめたΔS のつなぎ目である まとめると I= N /2 1 N /2 1 f a + 4 f a + 2i + 1 h + 2 f ( a + 2ih ) + f ( b ) h ( ) { } ( ) 3 i =1 i =1 となる 2次式で近似する方法は3次の打ち切り誤差を持つ 13 (19)

5 f x x 2/ π ( ) ( ) = e x2 = exp x 2 erf x ( ) = 2 π 0 x ( ) exp ζ 2 dζ x= 2/ π x= ( )2 1 f (x) = 2πσ exp x µ 2 2σ 2 x 2 14

6 f x x = g x ( ) = 0 ( ) x n+1 = g x n ( ) n x 0 g(x) x 1 = g x 0 ( ) x n+1 = x n x = x n+1 y y=x g(x) g(x 3 ) g(x 2 ) g(x 1 ) y=g(x) x 1 x 2 x 3... x x 15

7 ϕ x g x ( ) 0 ( ) = x ϕ ( x) f x x = g x ( ) x ϕ ( x) = g x x = g x 1 f x ( ) x n+1 = x n f x n ( ) ( ) = x f ( x) f ( x) ( ) ( ) f ( ) x n x y y=f(x) y=f (x 1 )(x-x 2 ) x x 3 x 2 x 1 x 16

8 t f ( x) = x esin x 2πt = 0 T e x t T t x x e = a2 b 2 a 2 (41) ab E E E x e x t 17

9 f95 taylor.f t_sine.f ****** Calculate sine by Talor-series expansion ****** program taylor implicit none integer i, n, ns real(8):: dx, xmax, pi real(8), allocatable:: x(:),s1(:),s2(:) real(8):: T_sine character(20):: fmt1 pi = 4.0d0 * atan(1.0d0) fmt1 = '(3f12.7)' write (6,*) 'Input number of samples for 1 period' read (5,*) ns write (6,*) 'Your input for number of samples = ',ns dx = 2.0d0 * pi / dfloat(ns) allocate ( x(0:ns),s1(0:ns),s2(0:ns) ) write (6,*) 'Input maximum order of Taylor series' 18

10 read (5,*) n write (6,*) 'Your input maximum order of Taylor series = ',n write (6,*) write (6,*) ' x sin(x) T_sine(x)' open (10,file='mysine.dat') do i = 0,ns x(i) = dx * dble(i) s1(i) = dsin(x(i)) s2(i) = T_sine(x(i),n) write ( 6,fmt1) x(i), s1(i), s2(i) write (10,fmt1) x(i), s1(i), s2(i) end do stop end program taylor ****** function T_sine ***************************************** function T_sine(x,n) implicit none integer:: k, n real(8):: pi real(8):: x, xp, fact_k, ak, fk real(8):: T_sine_k real(8):: T_sine real(8),parameter:: eps = 1.0d-10 19

11 pi = 4.0d0 * atan(1.0d0) initalize: f(x=0) = sin(0), 0 = 1, x**0 = 1.0 T_sine_k = 0.0d0 fact_k = 1.0d0 xp = 1.0d0 take summation sigma_( a(i)*x**i ) for i = 1 to n do k = 1,n fact_k = fact_k * dfloat(k) calculate factorial real(k) ak = (-mod(k,2))**(k/2) / fact_k coefficient of the series xp = xp * x fk = ak * xp calculate xp = x**k k-th order term T_sine_k = T_sine_k + fk calculate summation end do T_sine = T_sine_k return end function T_sine 20

12 real(8), allocatable:: x(:),s1(:),s2(:) allocate ( x(0:ns),s1(0:ns),s2(0:ns) ) real(8):: T_sine T_sine T_sine s2(i) = T_sine(x(i),n) T_sine write (10,500) x(i), s1(i), s2(i) real*8 function T_sine(x,n) T_sine = T_sine_k return 21

13 plot 'mysine.dat' using 1:2 plot 'mysine.dat' using 1:2, 'mysine.dat' using 1:3 plot 'mysine.dat' using 1:2 replot 'mysine.dat' using 1:3 replot 22

14 ** Error function ** Numerical integration by trapezoid method program trapezoid_i implicit none integer, parameter:: n = 1000 integer:: i real(8):: f(0:n) real(8):: x,x1,x2,dx real(8):: s1,sall real(8):: erf real(8):: pi,rootpi write (6,*) 'x1 =' read (5,*) x1 x1 = 0.0d0 write (6,*) 'x =' read (5,*) x2 dx = ( x2-x1 ) / dfloat( n ) do i = 0,n x = x1 + dx * dfloat(i) f(i) = exp( - x**2 ) end do s1 = 0.0d0 do i = 1,n-1 s1 = s d0*f(i) end do 23

15 sall = dx * 0.5d0 * ( f(0) + s1 + f(n) ) pi = 4.0d0 * atan( 1.0d0 ) rootpi = sqrt( pi ) erf = 2.0d0 / rootpi * sall write (6,*) 'Integral F = ',sall write (6,*) 'erf(',x2,')= ',erf stop end program trapezoid_i integer, parameter:: n = 1000n real(8):: f(0:n) f(i) = exp( - x**2 ) sall s1 = s d0*f(i) s 1 = n 1 i=1 ( ) f x i s1 24

16 Solve 2nd-order algebraic equation ax^2+bx+c=0 by a Newton method program newton implicit none real(4), parameter:: eps=1.0e-6 real(4):: a,b,c,x,fx,dfdx,xini,corr integer:: itr,nitr write (6,*) 'input a,b,c (use space between numbers)' read (5,*) a,b,c write (6,*) 'input inital guess' read (5,*) xini write (6,*) 'input maximum iteration' read (5,*) nitr x = xini Iteration do itr = 1,nitr fx = a*x**2 + b*x + c dfdx = 2.0 * a * x + b corr = fx / dfdx write (6,*) itr,x,fx,dfdx,corr x = x - corr If ( abs(corr/x).lt. eps ) Exit Exit loop if convergent end do write (6,*) 'solution x = ',x stop 25

17 end program newton dfdx = 2.0 * a * x + b x = x - corr If ( abs(corr/x).lt. eps ) Exit 26

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