/[MITgcm]/MITgcm/model/src/port_rand.F
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Revision 1.3 - (hide annotations) (download)
Wed Sep 26 18:09:16 2001 UTC (22 years, 7 months ago) by cnh
Branch: MAIN
CVS Tags: checkpoint46n_post, checkpoint51k_post, checkpoint47e_post, checkpoint52l_pre, checkpoint44e_post, hrcube4, hrcube5, checkpoint46l_post, checkpoint46g_pre, checkpoint47c_post, release1_p13_pre, checkpoint50c_post, checkpoint46f_post, checkpoint52d_pre, checkpoint48e_post, checkpoint50c_pre, checkpoint44f_post, checkpoint46b_post, checkpoint52j_pre, checkpoint43a-release1mods, checkpoint51o_pre, ecco_c50_e32, ecco_c50_e33, ecco_c50_e30, ecco_c50_e31, release1_p13, checkpoint51l_post, checkpoint48i_post, checkpoint46l_pre, checkpoint52l_post, checkpoint52k_post, chkpt44d_post, checkpoint54, checkpoint51, checkpoint50, checkpoint53, checkpoint52, release1_p8, release1_p9, checkpoint50d_post, release1_p1, release1_p2, release1_p3, release1_p4, release1_p5, release1_p6, release1_p7, checkpoint52f_post, checkpoint50b_pre, checkpoint44e_pre, checkpoint51f_post, release1_b1, ecco_c51_e34d, ecco_c51_e34e, ecco_c51_e34f, ecco_c51_e34g, ecco_c51_e34a, ecco_c51_e34b, ecco_c51_e34c, checkpoint48b_post, checkpoint43, checkpoint51d_post, checkpoint48c_pre, checkpoint47d_pre, checkpoint51t_post, checkpoint51n_post, release1_chkpt44d_post, checkpoint52i_pre, hrcube_1, hrcube_2, hrcube_3, checkpoint51s_post, checkpoint47a_post, checkpoint48d_pre, checkpoint51j_post, checkpoint47i_post, checkpoint52e_pre, release1_p11, checkpoint52e_post, checkpoint51n_pre, checkpoint47d_post, icebear5, icebear4, icebear3, icebear2, checkpoint53d_post, checkpoint46d_pre, checkpoint48d_post, release1-branch_tutorials, checkpoint48f_post, checkpoint45d_post, checkpoint52b_pre, checkpoint54b_post, checkpoint46j_pre, checkpoint51l_pre, checkpoint52m_post, chkpt44a_post, checkpoint44h_pre, checkpoint48h_post, checkpoint51q_post, ecco_c50_e29, checkpoint51b_pre, checkpoint46a_post, checkpoint47g_post, checkpoint52b_post, checkpoint52c_post, checkpoint46j_post, checkpoint51h_pre, checkpoint46k_post, ecco_c50_e28, chkpt44c_pre, checkpoint48a_post, checkpoint45a_post, checkpoint50f_post, checkpoint50a_post, checkpoint50f_pre, checkpoint52f_pre, ecco_c44_e19, ecco_c44_e18, ecco_c44_e17, ecco_c44_e16, release1_p12, release1_p10, release1_p16, release1_p17, release1_p14, release1_p15, checkpoint47j_post, checkpoint54a_pre, ecco_c50_e33a, checkpoint53c_post, branch-exfmods-tag, checkpoint44g_post, branchpoint-genmake2, checkpoint54a_post, checkpoint46e_pre, checkpoint51r_post, checkpoint48c_post, checkpoint45b_post, checkpoint46b_pre, checkpoint51i_post, release1-branch-end, release1_final_v1, checkpoint51b_post, checkpoint51c_post, checkpoint46c_pre, checkpoint53a_post, checkpoint46, checkpoint47b_post, checkpoint44b_post, ecco_c51_e34, checkpoint46h_pre, checkpoint52d_post, checkpoint53g_post, checkpoint46m_post, checkpoint46a_pre, checkpoint50g_post, checkpoint45c_post, ecco_ice2, ecco_ice1, checkpoint44h_post, checkpoint46g_post, release1_p12_pre, checkpoint52a_pre, ecco_c44_e22, checkpoint50h_post, checkpoint52i_post, checkpoint50e_pre, checkpoint50i_post, ecco_c44_e25, checkpoint51i_pre, checkpoint52h_pre, checkpoint53f_post, checkpoint52j_post, checkpoint47f_post, checkpoint50e_post, chkpt44a_pre, checkpoint46i_post, ecco_c44_e23, ecco_c44_e20, ecco_c44_e21, ecco_c44_e26, ecco_c44_e27, ecco_c44_e24, checkpoint46c_post, ecco-branch-mod1, ecco-branch-mod2, ecco-branch-mod3, ecco-branch-mod4, ecco-branch-mod5, branch-netcdf, checkpoint50d_pre, checkpoint52n_post, checkpoint53b_pre, checkpoint46e_post, release1_beta1, checkpoint51e_post, checkpoint44b_pre, checkpoint42, checkpoint41, checkpoint47, checkpoint44, checkpoint45, checkpoint48, checkpoint49, checkpoint46h_post, checkpoint51o_post, checkpoint51f_pre, chkpt44c_post, checkpoint48g_post, checkpoint53b_post, checkpoint47h_post, checkpoint52a_post, checkpoint44f_pre, checkpoint51g_post, ecco_c52_e35, checkpoint46d_post, checkpoint50b_post, release1-branch_branchpoint, checkpoint51m_post, checkpoint53d_pre, checkpoint54c_post, checkpoint51a_post, checkpoint51p_post, checkpoint51u_post
Branch point for: c24_e25_ice, branch-exfmods-curt, release1_final, release1-branch, branch-genmake2, release1, branch-nonh, tg2-branch, ecco-branch, release1_50yr, netcdf-sm0, icebear, checkpoint51n_branch, release1_coupled
Changes since 1.2: +12 -2 lines 
Bringing comments up to data and formatting for document extraction.
1 cnh 1.3 C $Header: /u/gcmpack/models/MITgcmUV/model/src/port_rand.F,v 1.2 2001/02/02 21:04:48 adcroft Exp $
2     C $Name: $
3 adcroft 1.2
4     C Portable random number generator
5    
6     #undef _USE_INTEGERS
7    
8     ! ==============================================================================
9 cnh 1.3 CBOP
10     C !ROUTINE: port_rand
11     C !INTERFACE:
12 adcroft 1.2 real*8 function port_rand()
13 cnh 1.3
14     C !DESCRIPTION: \bv
15     C Portable random number generator
16     C \ev
17    
18     C !LOCAL VARIABLES:
19 adcroft 1.2 implicit none
20     integer nff
21     parameter(nff=55)
22     #ifdef _USE_INTEGERS
23     integer mbig,mseed,mZ
24     #else
25     real*8 mbig,mseed,mz
26     #endif
27     real*8 fac
28     #ifdef _USE_INTEGERS
29     parameter (mbig=1000000000,mseed=161803398,mz=0,fac=1./mbig)
30     #else
31     parameter (mbig=4000000.,mseed=1618033.,mz=0.,fac=1./mbig)
32     #endif
33     integer i,ii,inext,inextp,k,idum
34     parameter(idum=-2)
35     #ifdef _USE_INTEGERS
36     integer mj,mk,ma(nff)
37     #else
38     real*8 mj,mk,ma(nff)
39     #endif
40     logical firstCall
41     save firstCall,inext,inextp,ma
42     data firstCall /.true./
43 cnh 1.3 CEOP
44 adcroft 1.2 ! ------------------------------------------------------------------------------
45     if(firstCall)then
46     firstCall=.false.
47     mj=mseed-iabs(idum)
48     mj=mod(mj,mbig)
49     ma(nff)=mj
50     mk=1
51     do i=1,nff-1
52     ii=mod(21*i,nff)
53     ma(ii)=mk
54     mk=mj-mk
55     if(mk.lt.mz)mk=mk+mbig
56     mj=ma(ii)
57     enddo
58     do k=1,4
59     do i=1,nff
60     ma(i)=ma(i)-ma(1+mod(i+30,nff))
61     if(ma(i).lt.MZ)ma(i)=ma(i)+mbig
62     enddo
63     enddo
64     inext=0
65     inextp=31
66     endif
67     inext=mod(inext,nff)+1
68     inextp=mod(inextp,nff)+1
69     mj=ma(inext)-ma(inextp)
70     if(mj.lt.MZ)mj=mj+mbig
71     ma(inext)=mj
72     port_rand=mj*fac
73     return
74     ! ------------------------------------------------------------------------------
75     end
76     ! ==============================================================================
77    
78     ! ==============================================================================
79     subroutine port_ranarr(n,arr)
80     implicit none
81     integer n,i
82     real arr(n)
83     real*8 port_rand
84     ! ------------------------------------------------------------------------------
85     do i=1,n
86     arr(i)=port_rand()
87     enddo
88    
89     return
90     ! ------------------------------------------------------------------------------
91     end
92     ! ==============================================================================
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