096679.zip_LMK_数据结构

下面这个是我写的(已修正其中考虑不周之处），请大家测试： Module Random2d Implicit None Type Point Real(8) x,y End Type Contains Subroutine Random_Circle(Num,R,Pnt) Integer,Intent(in)::Num Real(4),Intent(in)::R Type(Point),Dimension(Num),Intent(Out)::Pnt Real(4) x,y Integer i Do i=1,Num 15 CALL RANDOM(x) CALL RANDOM(y) If (x*(1-x)+y*(1-y)<0.25) Goto 15 Pnt(i).x=R*x Pnt(i).y=R*y End Do Return EndSubroutine End Module Program Main Use Random2d Implicit None Integer Num Parameter(Num=10000) Real(4) R Integer i Type(Point),Dimension(Num)::Pnt Print*, "Please Input the radius:" Read(*,*) R Call Random_Circle(Num,R,Pnt) Open(1,File='Rd2d_Circle.dat',Status='Unknown') Do i=1,Num Write(1,'(2(f12.6,2x))') Pnt(i).x,Pnt(i).y EndDo Close(1) End Program Main 不懂就不要死撑，我没有说你的方法不能实现，只是一直在强调，你的方法远非最佳！ 看看这个吧。 ! this module is to the date type Operating System independent module TypeKind implicit none integer(kind = kind(1)), parameter:: IP = kind(1) integer(kind = IP), parameter:: LP = kind(.true.) integer(kind = IP), parameter:: SP = kind(1.0) integer(kind = IP), parameter:: DP = kind(1.d0) end module TypeKind ! this subroutine generate Circle-Uniform-Distribution ! sample efficient 100% subroutine CircleUniform(NO, radii, r) use TypeKind, WP => DP implicit none ! the number of point you want to simulation integer(kind = IP), intent(in):: NO ! the radii of the cycle real(kind = WP), intent(in):: radii real(kind = WP), intent(out):: r(NO) integer(kind = IP):: i ! for loop real(kind = WP):: r1(NO) call Random_Number( r1 ) call Random_Number( r ) forall( i = 1 : NO : 1 ) r(i) = max( r(i), r1(i) ) end forall r = radii * r return end subroutine program main use TypeKind, WP => DP implicit none ! the number of point you want to simulation integer(kind = IP), parameter:: NO = 10000 ! the radii of the cycle real(kind = WP):: radii real(kind = WP):: r(NO) real(kind = WP):: theta(NO) integer(kind = IP):: i ! for loop ! parameter real(kind = WP), parameter:: Pi = 3.14159265358979_WP call Random_Seed() radii = 1._WP call CircleUniform(NO, radii, r) ! 至此，已经得到圆均匀分布，但为了画出图形，还是把极角也 ! 用 Monte-Carlo 撒点吧。 call Random_Number( theta ) theta = 2 * theta * Pi open(5, file = "Out06.dat") do i = 1, NO, 1 !write(5, *) r(i), theta(i) ! 若是 不是去画图，这些完全没有必要。 write(5, *) r(i) * cos(theta(i)), r(i) * sin(theta(i)) end do close(5) stop end program main ! this module is to the date type Operating System independent module TypeKind implicit none integer(kind = kind(1)), parameter:: IP = kind(1) integer(kind = IP), parameter:: LP = kind(.true.) integer(kind = IP), parameter:: SP = kind(1.0) integer(kind = IP), parameter:: DP = kind(1.d0) end module TypeKind ! this subroutine generate Circle-Uniform-Distribution ! sample efficient 100% subroutine CircleUniform(NO, radii, r) use TypeKind, WP => DP implicit none ! the number of point you want to simulation integer(kind = IP), intent(in):: NO ! the radii of the cycle real(kind = WP), intent(in):: radii real(kind = WP), intent(out):: r(NO) integer(kind = IP):: i ! for loop real(kind = WP):: r1(NO) call Random_Number( r1 ) call Random_Number( r ) forall( i = 1 : NO : 1 ) r(i) = max( r(i), r1(i) ) end forall r = radii * r return end subroutine program main use TypeKind, WP => DP implicit none ! the number of point you want to simulation integer(kind = IP), parameter:: NO = 20000 ! the radii of the cycle real(kind = WP):: radii real(kind = WP):: r(NO) real(kind = WP):: theta(NO) integer(kind = IP):: i ! for loop ! parameter real(kind = WP), parameter:: Pi = 3.14159265358979_WP Integer(2) itime(2,4),intet(4),ihr,imin,isec,i100th call gettim(ihr,imin,isec,i100th) itime(1,1)=ihr itime(1,2)=imin itime(1,3)=isec itime(1,4)=i100th call Random_Seed() radii = 1._WP Do i=1,No call CircleUniform(NO, radii, r) ! 至此，已经得到圆均匀分布，但为了画出图形，还是把极角也 ! 用 Monte-Carlo 撒点吧。 call Random_Number( theta ) theta = 2 * theta * Pi EndDo ! open(5, file = "Out06.dat") ! do i = 1, NO, 1 ! !write(5, *) r(i), theta(i) ! ! 若是 不是去画图，这些完全没有必要。 ! write(5, *) r(i) * cos(theta(i)), r(i) * sin(theta(i)) ! end do ! close(5) call gettim(ihr,imin,isec,i100th) itime(2,1)=ihr itime(2,2)=imin itime(2,3)=isec itime(2,4)=i100th do 50 i=1,4 if(itime(2,i).ge.itime(1,i))then intet(i)=itime(2,i)-itime(1,i) else intet(i-1)=intet(i-1)-1 if(i.ne.4)then intet(i)=itime(2,i)+60-itime(1,i) else intet(i)=itime(2,i)+100-itime(1,i) endif endif 50 continue write(*,200) intet(1),':',intet(2),':',intet(3),':',intet(4) 200 format(2x,3(i2,a1),i2) stop end program main 以上是Asym的程序 以下是我的程序 Module Random2d Implicit None Type Point Real(8) x,y End Type Contains Subroutine Random_Circle(Num,R,Pnt) Integer,Intent(in)::Num Real(4),Intent(in)::R Type(Point),Dimension(Num),Intent(Out)::Pnt Real(4) x,y Integer i y=0 Do i=1,Num x=5 Do While(x-x*x+y-y*y<0.25) CALL RANDOM(x) CALL RANDOM(y) EndDo Pnt(i).x=R*x Pnt(i).y=R*y Enddo Return EndSubroutine End Module Program Main Use Random2d Implicit None Integer Num Parameter(Num=20000) Real(4) R Integer i Type(Point),Dimension(Num)::Pnt Integer(2) itime(2,4),intet(4),ihr,imin,isec,i100th call gettim(ihr,imin,isec,i100th) itime(1,1)=ihr itime(1,2)=imin itime(1,3)=isec itime(1,4)=i100th ! Print*, "Please Input the radius:" ! Read(*,*) R R=100 Do i=1,Num Call Random_Circle(Num,R,Pnt) Enddo ! Open(1,File='Rd2d_Circle.dat',Status='Unknown') ! Do i=1,Num ! Write(1,'(2(f12.6,2x))') Pnt(i).x,Pnt(i).y ! EndDo ! Close(1) call gettim(ihr,imin,isec,i100th) itime(2,1)=ihr itime(2,2)=imin itime(2,3)=isec itime(2,4)=i100th do 50 i=1,4 if(itime(2,i).ge.itime(1,i))then intet(i)=itime(2,i)-itime(1,i) else intet(i-1)=intet(i-1)-1 if(i.ne.4)then intet(i)=itime(2,i)+60-itime(1,i) else intet(i)=itime(2,i)+100-itime(1,i) endif endif 50 continue write(*,200) intet(1),':',intet(2),':',intet(3),':',intet(4) 200 format(2x,3(i2,a1),i2) End Program Main 测试结果是 我的43.71秒, Asym的44.69秒。 比如我说，产生 100000 事例，看看在 r ＝ 0.5 圆内的几率有多少。 我的程序如下： ! this module is to the date type Operating System independent module TypeKind implicit none integer(kind = kind(1)), parameter:: IP = kind(1) integer(kind = IP), parameter:: LP = kind(.true.) integer(kind = IP), parameter:: SP = kind(1.0) integer(kind = IP), parameter:: DP = kind(1.d0) end module TypeKind Module CUMC use TypeKind, WP => DP implicit none contains ! this subroutine generate Circle-Uniform-Distribution ! sample efficient 100% subroutine CircleUniform(NO, radii, r) implicit none ! the number of point you want to simulation integer(k