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ÒÀ¾ÉÊÇÔòÐìͳæ (СÓÐÃûÆø)
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¹«¹²²ÎÁ¿É趨£¨×Ó³ÌÐòÀïµÄi£¬j ÔõÑùÉèÖòÅÄÜʹÓÃÉÏÃæÖ÷³ÌÐò´«ÈëµÄi£¬j ֵĨ£© ÒÑÓÐ1È˲ÎÓë
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¸÷룬ÎÒÕâÑùдµÄ³ÌÐò£¬µ«ÊÇ×Ó³ÌÐòÀïµÄi£¬j ÔõÑùÉèÖòÅÄÜʹÓÃÉÏÃæÖ÷³ÌÐò´«ÈëµÄi£¬j ֵĨ¡£ !Çó½âY''(T)=-(i+j*cos(2*T))*Y program main use IMSL implicit none integer, parameter :: MXPARM = 50 integer, parameter :: N = 2 integer IDO, ISTEP, NOUT real PARAM(MXPARM), T, TEND, Y(N) real, parameter :: TOL = 1E-8 external FCN real :: i,j do i=0,1,0.001 do j=0,1.5,0.1 write(*,"(I2,I2)" i,j PARAM = 0 WRITE (*,"(' Time', 9X,'Y')" Y(1) = 0 ! Initial condition Y(2) = 2.0 T = 0.0 ! Y(T)=4.0ÖеÄʱ¼äTÖµ IDO = 1 do ISTEP=0,100,10 TEND = ISTEP call IVPRK (IDO, N, FCN, T, TEND, TOL, PARAM, Y) write (*,'(F5.1,F12.4)') T, Y end do call IVPRK (3, N, FCN, T, TEND, TOL, PARAM, Y) end do end do stop end program ! ¼ÆËã΢·Ö·½³Ìʽ ! YPRIME=Y'=f(t,y) subroutine FCN (N, T, Y, YPRIME) implicit none integer N real T, Y(N), YPRIME(N) real i,j !Y''(T)=-(i+j*cos(2*T))*Y YPRIME(2) =-(i+j*cos(2*T))*Y(1) return end subroutine |
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