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C $Header: /u/gcmpack/MITgcm_contrib/darwin2/pkg/darwin/darwin_random.F,v 1.1 2011/04/13 18:56:24 jahn Exp $ |
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C $Name: $ |
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|
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#include "CPP_OPTIONS.h" |
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#include "DARWIN_OPTIONS.h" |
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|
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#ifdef PORT_RAND |
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#ifdef OLDSEED |
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These lines are here intentionally to cause a compile-time error: |
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If you really want to use PORT_RAND with OLDSEED, comment them out. |
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#endif |
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#endif |
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|
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#ifdef ALLOW_PTRACERS |
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#ifdef ALLOW_DARWIN |
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|
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CBOP |
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C !ROUTINE: DARWIN_RANDOM_INIT |
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C !INTERFACE: |
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SUBROUTINE DARWIN_RANDOM_INIT(seed, myThid) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE DARWIN_RANDOM_INIT |
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C | o Initializes the random number generator. |
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C | seed must be positive. |
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C | NOTE: not thread-safe yet!!! |
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C *=========================================================== |
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C | Algorithms: |
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C | - With PORT_RAND defined, this uses port_rand.f, which is |
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C | Knuth's portable random number generator [see Numerical |
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C | Recipes, Ch.7.1: ran3]. |
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C | We use the floating-point version. |
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C | In order to obtain unique sequences of random numbers, |
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C | the seed should be between 1 and 1618032. |
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C | - With PORT_RAND undefined, it uses the system's RAND |
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C | function. See the system documentation for ranges, etc. |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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#include "EEPARAMS.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C myThid :: thread number |
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INTEGER seed |
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INTEGER myThid |
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|
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C !FUNCTIONS: |
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C == Functions == |
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#ifdef PORT_RAND |
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real*8 port_rand |
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external port_rand |
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#endif |
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Coj these are needed for the Intel compiler, define the macro IFORT |
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Coj in your optfile if you want to use it |
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#ifdef IFORT |
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real*4 RAND |
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EXTERNAL RAND |
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#endif |
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|
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C msgBuf - Informational/error meesage buffer |
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CHARACTER*(MAX_LEN_MBUF) msgBuf |
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_RL RandNo |
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INTEGER nrand |
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#ifdef PORT_RAND |
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REAL*8 Dseed |
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#else |
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INTEGER Iseed |
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#endif |
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INTEGER IRand |
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CHARACTER*16 random_name |
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CEOP |
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|
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IF (myThid .GT. 1) THEN |
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CALL PRINT_ERROR('DARWIN_RANDOM_INIT: threading no supported', |
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& myThid) |
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STOP 'ABNORMAL END: S/R DARWIN_RANDOM_INIT' |
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END IF |
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|
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IF (seed .LE. 0) THEN |
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CALL PRINT_ERROR('DARWIN_RANDOM_INIT: seed must be positive' |
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& , myThid) |
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END IF |
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|
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#ifdef PORT_RAND |
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Dseed = float(seed) |
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RandNo = port_rand(Dseed) |
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C need to call again to get a non-zero random number |
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Dseed = -1.D0 |
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RandNo = port_rand(Dseed) |
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random_name = 'port_rand' |
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#else |
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#ifdef OLDSEED |
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Iseed = seed |
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do nrand = 1,Iseed |
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Irand = 0 |
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RandNo = rand(Irand) |
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end do |
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random_name = 'rand/oldseed' |
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#else |
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Iseed = -seed |
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RandNo = rand(Iseed) |
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random_name = 'rand' |
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#endif |
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#endif |
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|
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WRITE(msgbuf,'(A,A,I10,X,F20.16)') |
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& 'QQ random ', random_name, seed, RandNo |
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CALL PRINT_MESSAGE( msgBuf, standardMessageUnit, |
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& SQUEEZE_RIGHT , myThid) |
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|
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RETURN |
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END |
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|
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CBOP |
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C !ROUTINE: DARWIN_RANDOM |
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C !INTERFACE: |
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FUNCTION DARWIN_RANDOM(myThid) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | FUNCTION DARWIN_RANDOM |
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c | o returns a uniform random number between 0 and 1 |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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#include "EEPARAMS.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C DARWIN_RANDOM :: uniform random number |
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C myThid :: thread number |
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_RL DARWIN_RANDOM |
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INTEGER myThid |
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|
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C !FUNCTIONS: |
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C == Functions == |
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#ifdef PORT_RAND |
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real*8 port_rand |
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external port_rand |
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#endif |
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#ifdef IFORT |
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real*4 RAND |
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EXTERNAL RAND |
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#endif |
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|
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C !LOCAL VARIABLES: |
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C == Local variables == |
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#ifdef PORT_RAND |
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real*8 Dseed |
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#else |
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INTEGER Iseed |
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#endif |
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CEOP |
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|
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IF (myThid .GT. 1) THEN |
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CALL PRINT_ERROR('DARWIN_RANDOM: threading no supported', |
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& myThid) |
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STOP 'ABNORMAL END: S/R DARWIN_RANDOM' |
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END IF |
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|
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#ifdef PORT_RAND |
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Dseed = -1.d0 |
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darwin_random = port_rand(Dseed) |
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#else |
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Iseed = 0 |
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darwin_random = rand(Iseed) |
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#endif |
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|
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RETURN |
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END |
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|
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CBOP |
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C !ROUTINE: DARWIN_RANDOM_NORMAL |
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C !INTERFACE: |
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FUNCTION DARWIN_RANDOM_NORMAL(myThid) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | FUNCTION DARWIN_RANDOM_NORMAL |
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C | o returns a normally distributed random number with |
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C | mean 0 and stddev 1 |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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#include "EEPARAMS.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments == |
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C DARWIN_RANDOM_NORMAL :: normally distributed random number |
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C myThid :: thread number |
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_RL DARWIN_RANDOM_NORMAL |
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INTEGER myThid |
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|
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C !FUNCTIONS: |
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C == Functions == |
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#ifdef PORT_RAND |
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real*8 port_rand_norm |
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external port_rand_norm |
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#endif |
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#ifdef IFORT |
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real*4 RAND |
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EXTERNAL RAND |
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#endif |
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|
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C !LOCAL VARIABLES: |
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C == Local variables == |
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#ifndef PORT_RAND |
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INTEGER Iseed |
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real*8 uniform |
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real*8 normal |
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#endif |
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CEOP |
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|
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IF (myThid .GT. 1) THEN |
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CALL PRINT_ERROR('DARWIN_RANDOM: threading no supported', |
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& myThid) |
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STOP 'ABNORMAL END: S/R DARWIN_RANDOM' |
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END IF |
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|
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#ifdef PORT_RAND |
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darwin_random_normal = port_rand_norm() |
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#else |
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Iseed = 0 |
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uniform = rand(Iseed) |
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CALL invnormal(normal, uniform, 0.d0, 1.d0) |
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darwin_random_normal = normal |
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#endif |
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|
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RETURN |
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END |
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#endif /*DARWIN*/ |
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#endif /*ALLOW_PTRACERS*/ |
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c ========================================================== |
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