/[MITgcm]/MITgcm/model/src/port_rand.F
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Contents of /MITgcm/model/src/port_rand.F

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Revision 1.3 - (show 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 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
4 C Portable random number generator
5
6 #undef _USE_INTEGERS
7
8 ! ==============================================================================
9 CBOP
10 C !ROUTINE: port_rand
11 C !INTERFACE:
12 real*8 function port_rand()
13
14 C !DESCRIPTION: \bv
15 C Portable random number generator
16 C \ev
17
18 C !LOCAL VARIABLES:
19 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 CEOP
44 ! ------------------------------------------------------------------------------
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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